Hello again R&D. Thank you for your continued support, watching the video and always leaving a comment. Regarding your carb, if your bike runs well, pull hard, don’t fix it 🤘 Cheers pal. Thanks again Tom
Hi Tom this Andi from Germany 🇩🇪 very nice video again you have done 👍👍👍 great job 👏 ! But remember the spark plug BR8ES and BR9EG is for the restricted 80km/m and 11kW version of the Aprilia RS 125 the non restricted 22kW needs the BR10EG!!! If you drive wide open with the smaller heat rated spark plugs you might burn a hole in the piston. Continue with your great videos! You doing a good job 👍!!!
@@tomdidit4216 I also have aprilia rs125, you can check on my channel if you want. Now im rebuilding the engine, and i need to buy piston. What do you think is better Wiseco or Wossner. Sorry for bad english, thanks.
Hello Ste Law. Thanks for watching the video and leaving a comment. The new needle works great for me. Please note well, the K21 does slightly lean the mixture over the K57, so small I encourage you small incremental adjustments👍 Thanks again. Tom
Thanks for great video! I am working on combining Polini 155 cylinder kit, Arrow street regal chamber and silencer, and VHSB 34mm carb for a '99 RS125. Your work would be good and practical reference for setting up my motor.
i enjoyed that very much...you have to be carefull doing jet changes by road side i once lost the circlip for needle and had to push bike home because like you i was cold could not feel fingers,lol
Tom, I have so many things I want to tell you about your RS in general after watching a few episodes, but honestly I'd rather start by two things: 1. The mod you did to the GoPro for the audio is better indeed than the GoPro Mod, the Mod has a very weird sound profile capture, it does not really pick up in the same strength the same frequencies the human ear does. Yet, after a LOT of testing on this particular subject, I 100% guarantee to you that what works better is a full body thick sponge case for the GoPro. Amazon is flooded with them. Don't cheap out too much, they're fragile in nature, but also don't spend 10€ each like I do because of the same reason. 2. I find that based on what you show us on the videos, the commuting and so, your tune of the bike in general is really opposite to what you want. You're getting a lot of things done that increase top range performance in clear detriment of the medium and lower range. The exhaust is a good example. For how you ride around, the stock one would suit you much better. This carburetor follows the same line. I'm not here for long enough to really know if you've explained these topics in a video, I'm guilty of having skipped bits here and there. So maybe there's a reason for it? Either way, I like both how you do your content and how you approach the tuning on the bike. Love how you dig into technical details and so on. Keep it going
Hi and thanks for the large comment. 1. I have seen this mod tested on the GoPro. Taking onboard your advice, I will be sure to buy the more expensive foam covers from Amazon👍. 2. I agree. It’s very hard to tune these 125 bikes to perform well throughout low, mid & high rpm’s. The work I have done has noticeably increased the top end performance. As the Aprilia is in such good condition I plan to stop riding it around the city as start using it for longer more leisurely trips (as intended). My Honda will be used around the city👍 Thanks again for leaving a comment and sharing your advice. Cheers Tom
Hi Tom thanks . I am working on my 2011 rs125 . Only 6000 km ! I am down in Canberra .. fun little bikes . Poor little guys they have become a bit of a orphan. Bits are a bit hard to find .
Mark I agree with you on this. However parts for the RS are way easier to source than my Honda build. I find PJME to be the best source for all things RS👍 of course there is a long wait time between orders due to them being in the UK.
@@vanano28 Il go check out what my main jet is. My setup is 34 Delloryo, Gianelli exhaust, powerfilter. De rest is fully stock. But I might need some small adjustments to the carb..
I am at 154 main jet currently. Needle clip 2nd notch from top. Also went back to slightly modified air filter box. But bike hardly goes 150km/h on the dash. (analog) Rides great, plenty off power on the first few gears. But not so much power in especially 5 and 6th gear. Any tips?
Hello and thanks for the video! I have the 1998 model of the rs 125, the racing replica extrema model, with the same 34mm carb. I was just wondering where you get your parts from? I cant seem to really find any spare parts online and i need to do some tuning on my carb as it completely loses power on full throttle and cant go past 9000rpm without bogging out and it does the same mid range bogging as yours did when it was running too rich. The previous owner removed the original air filter box and fitted a completely open K&N filter, and i suspect that he just put on a way too big main jet because it is running really rich right now.
Hi 2 stroke rides🤘 I believe the 10 burns cooler than the 8, this means the 10 may work better at constant wide open throttle when more heat is generated. I’m only using the 8 because it burns hotter, clears oil better and found it suits my inner city riding👍
Hi Tom, I really enjoy these videos. Especially since you are most of the aprilia 125 two stroke game here on yt, (for me at least) I'm struggling with the carburettor myself and I've learnt a lot of this video. However I've got one question , could you leave the link where you bought the different main jets? I'm going to buy some myself and was wondering if you bought them as a pack so that it's possible to mix and feel what's best for my bike... looking for a set between 128-200 ish.... Thanks! keep it up.
I have Yamaha YZF R15v4M which is 155cc but still wanna try your 2stroke bike ;in reality it’s impossible cuz staying in other part of the globe!keep rollin…
Hi Tom, Your bike really seems to fly and looks really great. Why do you prefer a 125 machine, is it because of good fuel consumption and generally reasonable cost to run/own? I can see the appeal as it looks like a grown up bike, light weight and is proper machine. I would be also interested to know if you plan to do any road trips in Australia? Thanks
Greeting Ian Firstly thank you for your message - and my apologies for the late response. I have been away for a few days. The de-restricted Aprilia really does fly for a 125. Luckily I found this bike was well looked after with low KMs. I own this bike because I’m reliving my youth. These were the “bike to own” when I was 16-17 years old in the UK. Plus I’ve only owned 2 strokes….😎 These bikes were developed on the track and honestly, does not suit my inner city traffic commuting. That said, I still love it. I do plan on taking a few road trips around Australia one day, but it’ll have to wait until I get a sports tourer (or something bigger). Are you a bike rider? Cheers Tom👍
Hello Tom, I think that the correct procedure for the plug chop is grabbing the clutch lever and stopping the engine with the red switch, and while the engine is at 0 rpm then stopping the bike and checking the plug. When engine is not stopped immediately, as in the video, the reading is not accurate.
Hello there Javier. Thank you for your comment. In my opinion - you are correct👍 Sorry, this video shows a bad example of “how to plug chop”. The very first video I made is a better example. Cheers Tom
Hi. What filter do you use? Thanks. I have a rs140 with 40hp at wheel with "hartruson" intake on standard airbox and I believe I have lack of air 😕 and there is almost no sound from intake...for me it is also very important 🙂🚀
Any recommendations for a main jet for 34 VSBH with a gianelli exhaust. Original cilinder, intake etc. It rides not bad, its not bogging or anything. But I am just curious if it can get any better. I am currently rebuilding my engine. Greetings from Holland 🇳🇱
Can you confirm or deny but I want to be sure? To adjust idle RPM and AFR you use bolts at the side od carburetor, and than, after test drive you adjust AFR using main jet and needle position acording to the colour of spark plug and exhaust gases?
Change the 30hp cdi to the 15 hp cdi. The problem will almost disapear. They did this to get better emissions. This is since the rotax 122 engines. The 123 does not have this problem at all, because it has a different cdi system. The cdi should be located under the passenger seat.
So, i just read, that the RD and RM models have an ecu and the carb has a TPS sensor. So if yours is one of those models, then my advice will not apply.
Hi Tom, I have also been thinking about installing the 34mm carb but don't know if it justifies the price as they are pretty expensice arround here. Is the extra power really that noticable and worth it? Great video ones again!
Hello there! Thanks for commenting as usual. The 34mm carb adds power throughout the rpm, especially the top end hit. I really like it. We should remember it is a 125, but the power increase is noticeable👍
@@tomdidit4216 tom listen same bike as you and you need 36 idle jet 155 main jet needle top notch and air screw 1 and half turns out you will never get rid of the spluttering around 7000rpm because these carbs are made for rotax 123 engine not rotax122
Hi there T.T.G Thank you for your comment. If I try the 155, I should proceed with caution as I’m using K21 needle. As the temperature warms up here in Australia I may need to lean the mixture some more, but see how it goes👍
I have a similar problem to the one you had in the video, specifically the part where the bike shuts off when accelerating. In my case it is a Yamaha TZR 125, when I accelerate to high speed the motorcycle dies to the point of almost turning off and in some cases it turns off, according to your experience do you have any idea why that happens?
Hi Chus I’m my case it was the incorrect carb needle causing a rich condition in the midrange. The larger needle has leaned out the midrange on my bike, which has greatly improved the midrange. In your case: Maybe try adjusting the needle position. Moving the needle up, by lowering the C-clip will (safely) richen the mixture. Go for a test ride and see if there is any improvement. If it is worse, then try to lean the mixture bu adjusting the needle in the opposite direction. Good luck! T
Hello there. Thanks for leaving a comment. Unfortunately I have not studied the 28mm carbs. if you have a stutter in the midrange, my best advice is to try adjusting the needle position in both directions to see if there is any improvement👍 Cheers T
hello sir! Dellorto VHSB 34 LD - Standard 2T, Aprilia RS 125 (1994-1995)rotax122 Hauptdüse: 160 Leerlaufdüse: 40 Starterdüse: 60 Düsennadel: K 57 Mischrohr/Zerstäuber: DP 266 Schwimmernadelventil: 300 Schwimmer: 9,0g Gasschieber: 40 or Hauptdüse: 152 Leerlaufdüse: 40 Starterdüse: 60 Düsennadel: K 43 Mischrohr/Zerstäuber: DQ 266 Schwimmer: 4,0g Gasschieber: 50 or the old school way rorax 123 148 K 56 DP 266 3. Kerbe 40 (Düse) 40 gasschiber My setup is 172 k56 dp 266 kerb1 lowest 40 idel 40 schieber with154cc polini and polini ehaust made for the 154cc kit back in the 90s! 25yeras ago deam im old!
and yes br10eg is standart for all 30-34hp models with rotax 122-123!!! dont yous 9 oder even lower!!!! 9 is ok for city driving. 10 is the way to go for some full speed rides. if you higher the compression and use 100oktcan + thing abaout a 11!
Not a carb question , but wondering how you toggle dash settings ? Mines is stuck on trip 2 but it was in mileage , I can figure how to change it back 🤣 any help pleaseee
Hello Reid There is usually a small black button under the indicator switch (left hand side). You will need to look carefully underneath👍 Press it to alter the display. Cheers Tom
Hello Markuss. I would listen to the engine. It may ping if the mixture becomes too lean. Also, with the bike hot, replace your spark plug with new and check after 10 mins of riding. The colour of the new plug will indicate what’s happening inside the engine. There are plenty of pictures online of what a 2 stroke spark plug should look like (with good mixture). Cheers pal
Hi I put pilot jet 36 it was 40 and i put k21 on the stock 160 main jet and it still idle too high od idle if i want it to be around 2k rpm i need to open idle screw 2.5 turns i will order 155 main jet maybe that will help do you have any suggestions
Hi. I am currently using a 150 main jet as it has been hot here in Sydney, Australia. The bike was bogging before but runs really crisp now. I believe I’m running a 36 pilot , air screw 2 turns out. This seems to work for me👍 Cheers Tom
Hi! We started to tune with your setup. Fixed the needle valve, closes correctly, but with the 160 main jet the air screw did nothing. We put back the 148 but it still does nothing. When we close the fuel tap after a minute it starts to run lean, then it revs with the air screw. Now, we know it melts the bike so that's not the way to try. We had a very dark brown spark plug, we've been told to lower even the 148 jet. The pilot jet was B36 changed to B35, seem okay. We were trying to mess with the float level, with your measurement it was less than 14. We've been told that hold the carb upside down, release the float and let it settle by gravity, then from the gasket surface it must be 11mm. Our is slightly bigger now. What should we try, and I can't understand how the hell could you set your bike up with these parts?
Hi Krisztián Thanks for your message. It took me many hours of trial and error to get my bike good with this carb. Since making the video I have altered the carb settings again due to the rapidly changing climate here in Australia. My main jet is now 150 as it is now our warmer humid months. I also experienced difficulty with the float level. This was causing me massive difficulties. Make sure the float is not sticking inside the bowl and causing overflow/flooding. My current settings are -B36 pilot -Thick needle top clip -And 150 main jet. Do you have a new carb or an old carb that is restored like mine?
@@tomdidit4216 thanks for the update! I think the carb is even older than the bike🤣. We got this from an old AF1 racer, properly set with the 150cc cylinder, wasn't restored yet. Tomorrow I compeletly disassemble it, my car mechanic mate will ultrasonic clean ever part from any bit of dust. After that I got a new kit of seals O rings etc, it will go together with them. Many people said we got plus air sucked in somewhere, but tested with the brake cleaner, didn't rev so we guess no. We got a darkbrown spark plug with a 148 main and B35 idle jet, K21 needle ofc. In hungary the spring is starting, I'm usually tuning and riding in 20°C. You need the bigger idle jet and I think the bigger main too because the air contains less oxygen in Australia?
Hi great video. Could you help with this at all. Bought an Aprilia it has a full arrow exhaust on it and 34mm carb it’s a 2001 rs. It will idle fine but when riding on brake ing it cuts out. It will also do this sometimes when releasing choke and go to rev it will die. Any help would be highly appreciated
hey mate , i’m based in Australia too and been watching your videos quite often right now as i’m about to get my RS125 soon . is there any social media platform that you could share so easy for me to contacting you regarding the bike issues and pro tip . Thanks mate cheers
Hello there. Thanks for your comment. I prefer to use the 8 as it burns hotter and suit my inner city riding conditions. As I understand, the cooler candles 9&10 are better suited for racing (wide open throttle) as the burn a little cooler. I think either will work well👍 Thanks again for your comment! Cheers Tom
@@tomdidit4216 hi Tom, the 8 candle is for the reduced-power version, if you drive longer with the 8 you can get a piston seizure and you will never get full power with the candle, you have to mount the 10 for this. do you have your setup ready for the 34? I also ride 34 and mine revs perfectly without stuttering once, if you want I'll give you advice on the setup. Facebook?
hey tom , i have an 96 mp00 with rotax 122 .. got an 34 dellorto but my midrange between 5 to 6.5k is running shitty ... it stutters a lot ... i have 155 main b34 pilot and x25 needle ... any advice ? great videos btw !! greets from germany
In my case, the problem you describe was caused by a rich condition (too much fuel in midrange) as the needle controls the midrange, I use a thicker needle to lean the mixture. First try adjusting the clip on your existing needle to see is the issue improves. You may need to change the needle.
I have the same bike with all the same parts mines a 2009 I tried a k21 but if I was you I'd try the k52 way better for mine and gets rid of all the stutters
MrNathyboi, thanks for your messages. Are you using the snorkel on the air box? Mine is removed (when I bought the bike) and have never felt the need to install it. Cheers Tom
I put a piper x pod filter on it last night I did have a standard box with a Morley design snorkel but the pod filter is even better im now running a 160 main b36 and k52 on the top notch and it revs quick and crisp and pulls all the way with no stutters
Hello tom can I ask you if I can contact you for asking some questions about the rs125 I come from Italy I’m sorry for my bad English Thank you for your time
Hello there Enrico In summary - operating temperature. The BR8ES is hot, the 9ES is cooler and the 10ES (or equivalent) burns even cooler. The 10 works well at high RPMs and racing conditions. As I understand, they are all suitable for the rotax 122, depending on your tuning and riding conditions👍. Cheers Tom
Hey so I'm 16 and currently have a moped but I'm getting a 125 in a few months as I turn 17 (A1 restrictions in UK) and I'm a bit unsure what to get because basically all top line 125cc are the same for example yamaha mt 125 and yamaha yzf r125 have the same acceleration and same top speed even with how different the style of bike they are. So I was looking to get a honda cb 125r however the aprilia rs 125 is the only 125cc bike that i know of that changes the game due to it being two stroke My question is that, is it really hard to maintain an rs 125, is it legal for A1 use as it has way more horsepower, just general comparison Because I would love something with more power however I don't know if there is drawbacks I hope you see this as I'm dying trying to figure this all out😂 My moped is 4 stroke so I have no idea about 2 stroke engines
Greeting Ellis. Thanks for your message - I hope my response finds you well. When Aprilia RS came out I was 16. It was a dream bike for me, however I could never afford one. I’m 39 now and had to get one. They are so much fun! Understanding your current situation, if you are after extra power and some fun, there is nothing like a good running 2 stroke (in my opinion). Of course, extra power comes extra maintenance. The Yamaha YZF125R and Honda would also be fun, reliable and make a great commuting bike due to the fact it is using modern 4 stroke technology etc etc. It’s an exciting time for you. Wishing you good luck with the decision you make👍. Regards Tom
Greetings ametti000 Thanks for watching and leaving a comment. You are correct, I am in Sydney. Good to hear you once owned a Mito & an RS250. Both awesome bikes! I’ve personally never rode an RS250, however I’ve heard they go surprisingly well… If I decide to sell, I’ll be sure to drop you a line👍 Cheers Tom
Hi Tom. Have you got the latter bike with the piaggio ecu or the earlier Nippon denso? I heard the later bikes have electronic restrictions and a catalytic converter? What are your thoughts?
Hi Ametti To be honest I’ve not checked my ECU. The last owner told me the Arrow exhaust and ECU came restricted as standard. But I am unsure of this.👍
Great video👍😀 i an rebuilding a old aprilia my self, i an looking for an arrow exhaust for my bike, but vant seem to find one online, maby you can help me? Know anyone who has a exhaust for sale ? 👍😀
Is every bike can tune? The aprilia rs4 125 like shit hp only 15 even top speed the top speed only 120kph. Can inc the top speed until 180kph and increase hp?
Hello Tan Thank you for your message. There main difference here is the 2 stroke engine and the 4 stroke engine. There are videos on YT that explain the main differences (if you are interested)👍 Long story short, small capacity 2 stroke engines will often outperform the 4 stroke equivalent. My bike in the video has a somewhat “tuned” engine. To answer your questions- I don’t think the newer RS4 motor can match the performance of the older RS without spending big money. That said, the RS4 is still a great bike for twisting roads etc etc👍👍 Hope this helps Cheers Tom
Hi Tom that's not running as it should mate I have been selling these for over 20 years different models same engine Put your snorkel back on ! Full snorkel 36 pilot 155 main k57 on top clip will run perfect your problem is no snorkel
Luciano, thank you for leaving this comment and sharing your Aprilia experience. I have read that the air box snorkel provides sound resonance back into the carb, thus helping air flow. Is this correct? Otherwise, my bike pulls so much stronger with the new and tuned carb. Not sure I want to try changing it…. I’m interested to learn how the bike sounds to you? Thanks again for watching and leaving a comment. Very much appreciated!! Cheers Tom
@@tomdidit4216 Hi Tom I do run one of my rs125s with a piper cross cone filter but the bike is set up correctly or running polini 154 jolly Corsa exhaust etc and that runs spot on some say they don't run on cone filters but it's all about set up ! Anyway you will find if you put the snorkel back it will be even smother I can hear you still are not right in mid range At end of day aprilia designed these back in my day with 34 carb and standard airbox Put snorkel back in make sure it is full snorkel not cut down as some do ! 2.5 turns out air screw 36 pilot 155/ 158 main start at 155 K57 needle top clip so leanest setting You will feel it will feel so clean all way through and get 12k no problem If you want really tune it Go polini 154 / jollymoto Corsa 115 exhaust / 34 carb 160 main open cone / lightened flywheel port polini bike is crazy quick for one of these with good ! Reliability just change rings every 3k miles good for 10k bottom end Remember to do good quality rod kit before putting polini 100% get snorkel back in I buy loads of these and young kids take them out they just run terrible and impossible to set up
Isn't the flat spot a CDI issue? and somewhat irrelevant as the bike really isn't happy unless running below 6500 and makes almost no power under that.
Samuel Thanks for your comment👍 The stutter around appears to be a 6,500 is a common issue with this bike. I have read also that it could be the CDI unit - I’m my case it was the jetting. These days, due to warmer weather, I’m finding that a 150 main jet is working well.
@@tomdidit4216 yeah in Europe are least in the 90s and 00s the Italians purposely retarded the ignition at certain rev point to get around emissions laws. But it didn’t effect the bikes cos obvs they only get ridden above that RPM. Mine had a horrible flat spot from new but it was 4-5. Not as high as 6.5
Usas una bujia incorrecta... La bujia apropiada es la br10eg, lo dice el manual de aprilia rs 125 rotax 122....aprilia rs 125 full power br10eg Aprilia rs 125 15 hp br8eg
Hello SPAINVENE Thank you for watching the video and leaving a comment. I use the 8 plug as it burns hotter and suits my city riding. I will use the 10 plug if I ever plan on riding the bike hard for longer periods or track use👍 Thanks again Tom
ngk 8 thats for a 50cc scooter with 4hp or somthing like this!!! 125cc lawnmower with 12hp youse a 8! First your runtime is to short! the other thing is for what YOU are aming? Peak power for a dyno run or a street setup with some headroom. same setup with a 10 is black, but wiht a 8 its witht like perfekt on top! or you rich ore lean?
Merci pour ton partage, j’ai réussi à mettre au point la mienne grâce à tes réglages ✌️😁
Un bonheur cette machine
Great to see a video with the Aprilia again!
Phillip, hi
Thanks for your comment. It has been a while!
What to do next…..?
@@tomdidit4216 Great question! Maybe some sort of Dynorun on the new carb? Can't think of anything else.
That’s exactly what was on my mind👍
you need a modified intake for the air filter if you drive without it stucks 6-7k
Great video as always Tom, still running my VHST28 Carb ;-)
Hello again R&D. Thank you for your continued support, watching the video and always leaving a comment.
Regarding your carb, if your bike runs well, pull hard, don’t fix it 🤘
Cheers pal. Thanks again
Tom
Hi Tom this Andi from Germany 🇩🇪 very nice video again you have done 👍👍👍 great job 👏 !
But remember the spark plug BR8ES and BR9EG is for the restricted 80km/m and 11kW version of the Aprilia RS 125 the non restricted 22kW needs the BR10EG!!! If you drive wide open with the smaller heat rated spark plugs you might burn a hole in the piston.
Continue with your great videos! You doing a good job 👍!!!
Thanks for your comments Andy and liking the video.
Many other comments have noted the use of the 10EG spark plug.
I’ll do some research👍
Regards
Tom
The 10EIX is the same as 10EG but its made of Iridium and better for our bikes
Amazing job Mr. !!!
Greetings Z Flo Z
Thanks for watching and leaving a comment👍
Keep doing videos like this! Very good.
Hi there MitreMC
Thanks for tuning in and leaving a comment. Glad to hear you like the video👍👍
@@tomdidit4216 I also have aprilia rs125, you can check on my channel if you want. Now im rebuilding the engine, and i need to buy piston. What do you think is better Wiseco or Wossner. Sorry for bad english, thanks.
Awesome video m8 and thank you.i didnt think about trying the k21 but i will now
Hello Ste Law.
Thanks for watching the video and leaving a comment.
The new needle works great for me. Please note well, the K21 does slightly lean the mixture over the K57, so small I encourage you small incremental adjustments👍
Thanks again.
Tom
Hi tom what range does your torq wrench go from and to (nm) i need 1 to work on the rs.thanks
Hi Ste
I use an SP Torque wrench with 3/8 drive.
This digital model ranges from 4.2nm to 85nm. This is suitable for most Aprilia applications👍
Good going Tom that bike pretty powerful it sounds just like my aprilia classic custom 125 122
Yes sir.
It goes pretty well for a 125👍
As I’m sure you can appreciate, the Aprilia 122 is a great motor.
Thanks for your comment Darren!
No problem and yes there seems to always be a way for making more power drilling the clutch basket is a good cheap mod
Think I’ll be doing clutch pressure plate next. We’ll see.
Thanks for great video! I am working on combining Polini 155 cylinder kit, Arrow street regal chamber and silencer, and VHSB 34mm carb for a '99 RS125. Your work would be good and practical reference for setting up my motor.
Greetings CNU🤝
Glad my videos are of some use. Good luck with your upcoming bike improvements!
Cheers
T
i enjoyed that very much...you have to be carefull doing jet changes by road side i once lost the circlip for needle and had to push bike home because like you i was cold could not feel fingers,lol
👍😀👍
Merci beaucoup! Tu es un champion
Glad I can help
Hope you enjoyed the video👍
Tom
@@tomdidit4216 tes vidéos m'ont beaucoup aidé pour restaurer ma moto. Merci
Tom, I have so many things I want to tell you about your RS in general after watching a few episodes, but honestly I'd rather start by two things:
1. The mod you did to the GoPro for the audio is better indeed than the GoPro Mod, the Mod has a very weird sound profile capture, it does not really pick up in the same strength the same frequencies the human ear does. Yet, after a LOT of testing on this particular subject, I 100% guarantee to you that what works better is a full body thick sponge case for the GoPro. Amazon is flooded with them. Don't cheap out too much, they're fragile in nature, but also don't spend 10€ each like I do because of the same reason.
2. I find that based on what you show us on the videos, the commuting and so, your tune of the bike in general is really opposite to what you want. You're getting a lot of things done that increase top range performance in clear detriment of the medium and lower range. The exhaust is a good example. For how you ride around, the stock one would suit you much better. This carburetor follows the same line.
I'm not here for long enough to really know if you've explained these topics in a video, I'm guilty of having skipped bits here and there. So maybe there's a reason for it? Either way, I like both how you do your content and how you approach the tuning on the bike. Love how you dig into technical details and so on. Keep it going
Hi and thanks for the large comment.
1. I have seen this mod tested on the GoPro. Taking onboard your advice, I will be sure to buy the more expensive foam covers from Amazon👍.
2. I agree. It’s very hard to tune these 125 bikes to perform well throughout low, mid & high rpm’s. The work I have done has noticeably increased the top end performance. As the Aprilia is in such good condition I plan to stop riding it around the city as start using it for longer more leisurely trips (as intended). My Honda will be used around the city👍
Thanks again for leaving a comment and sharing your advice.
Cheers
Tom
Hi Tom thanks . I am working on my 2011 rs125 . Only 6000 km ! I am down in Canberra .. fun little bikes . Poor little guys they have become a bit of a orphan. Bits are a bit hard to find .
Mark
I agree with you on this. However parts for the RS are way easier to source than my Honda build. I find PJME to be the best source for all things RS👍 of course there is a long wait time between orders due to them being in the UK.
@@tomdidit4216 ordered the bits thanks
You goood video
My setup with 34 dellorto mainjet 140and x56 firts clip and sport exhaust. Running perfect
What exhaust are you running?
@@gerbenvandooren6037 tavi, spanish exhaust, with giannelli the same thing. 150 main jet or more is to much.
150 should be ok. I’m now running 152 main jet with sports exhaust.
@@vanano28 Il go check out what my main jet is. My setup is 34 Delloryo, Gianelli exhaust, powerfilter. De rest is fully stock. But I might need some small adjustments to the carb..
I am at 154 main jet currently. Needle clip 2nd notch from top. Also went back to slightly modified air filter box. But bike hardly goes 150km/h on the dash. (analog)
Rides great, plenty off power on the first few gears. But not so much power in especially 5 and 6th gear.
Any tips?
Hello and thanks for the video! I have the 1998 model of the rs 125, the racing replica extrema model, with the same 34mm carb. I was just wondering where you get your parts from? I cant seem to really find any spare parts online and i need to do some tuning on my carb as it completely loses power on full throttle and cant go past 9000rpm without bogging out and it does the same mid range bogging as yours did when it was running too rich. The previous owner removed the original air filter box and fitted a completely open K&N filter, and i suspect that he just put on a way too big main jet because it is running really rich right now.
You Should try a VHSB34 XS carb. Curious to see what you think of it!
Candle BR10EIX 👌
Tom you did the plug chop on a BR8EG plug. A full power RS needs a BR10EG plug. Even the Aprilia manual sais this. I would look into if I was you :)
Hi 2 stroke rides🤘
I believe the 10 burns cooler than the 8, this means the 10 may work better at constant wide open throttle when more heat is generated.
I’m only using the 8 because it burns hotter, clears oil better and found it suits my inner city riding👍
@@tomdidit4216 Use the 10 unless you have fouling, then drop to a 9. Always use the highest number you can get away with.
Hi Tom, I really enjoy these videos. Especially since you are most of the aprilia 125 two stroke game here on yt, (for me at least) I'm struggling with the carburettor myself and I've learnt a lot of this video. However I've got one question , could you leave the link where you bought the different main jets? I'm going to buy some myself and was wondering if you bought them as a pack so that it's possible to mix and feel what's best for my bike... looking for a set between 128-200 ish.... Thanks! keep it up.
Buy from polini, good quality, its what i run.
I have Yamaha YZF R15v4M which is 155cc but still wanna try your 2stroke bike ;in reality it’s impossible cuz staying in other part of the globe!keep rollin…
Hi Tom,
Your bike really seems to fly and looks really great.
Why do you prefer a 125 machine, is it because of good fuel consumption and generally reasonable cost to run/own?
I can see the appeal as it looks like a grown up bike, light weight and is proper machine.
I would be also interested to know if you plan to do any road trips in Australia?
Thanks
Greeting Ian
Firstly thank you for your message - and my apologies for the late response. I have been away for a few days.
The de-restricted Aprilia really does fly for a 125. Luckily I found this bike was well looked after with low KMs.
I own this bike because I’m reliving my youth. These were the “bike to own” when I was 16-17 years old in the UK. Plus I’ve only owned 2 strokes….😎
These bikes were developed on the track and honestly, does not suit my inner city traffic commuting. That said, I still love it.
I do plan on taking a few road trips around Australia one day, but it’ll have to wait until I get a sports tourer (or something bigger).
Are you a bike rider?
Cheers
Tom👍
Hello Tom, I think that the correct procedure for the plug chop is grabbing the clutch lever and stopping the engine with the red switch, and while the engine is at 0 rpm then stopping the bike and checking the plug. When engine is not stopped immediately, as in the video, the reading is not accurate.
Hello there Javier. Thank you for your comment.
In my opinion - you are correct👍
Sorry, this video shows a bad example of “how to plug chop”.
The very first video I made is a better example.
Cheers
Tom
That is such a sexy RS125
Did it increase any performance in the way of accelerating or top end
Or was this just for a smoother ride
Hi. What filter do you use? Thanks. I have a rs140 with 40hp at wheel with "hartruson" intake on standard airbox and I believe I have lack of air 😕 and there is almost no sound from intake...for me it is also very important 🙂🚀
Aprilia 125cc but very fast, in Indonesia it is rare that any owner has but the old version
Any recommendations for a main jet for 34 VSBH with a gianelli exhaust. Original cilinder, intake etc.
It rides not bad, its not bogging or anything. But I am just curious if it can get any better.
I am currently rebuilding my engine.
Greetings from Holland 🇳🇱
Can you confirm or deny but I want to be sure? To adjust idle RPM and AFR you use bolts at the side od carburetor, and than, after test drive you adjust AFR using main jet and needle position acording to the colour of spark plug and exhaust gases?
Have you considered using EGT sensor and/or O2 sensor to dial in the carb?
Change the 30hp cdi to the 15 hp cdi. The problem will almost disapear. They did this to get better emissions. This is since the rotax 122 engines. The 123 does not have this problem at all, because it has a different cdi system. The cdi should be located under the passenger seat.
So, i just read, that the RD and RM models have an ecu and the carb has a TPS sensor. So if yours is one of those models, then my advice will not apply.
Hi Tom, I have also been thinking about installing the 34mm carb but don't know if it justifies the price as they are pretty expensice arround here. Is the extra power really that noticable and worth it?
Great video ones again!
Hello there! Thanks for commenting as usual.
The 34mm carb adds power throughout the rpm, especially the top end hit. I really like it. We should remember it is a 125, but the power increase is noticeable👍
@@tomdidit4216 tom listen same bike as you and you need 36 idle jet 155 main jet needle top notch and air screw 1 and half turns out you will never get rid of the spluttering around 7000rpm because these carbs are made for rotax 123 engine not rotax122
Hi there T.T.G
Thank you for your comment.
If I try the 155, I should proceed with caution as I’m using K21 needle.
As the temperature warms up here in Australia I may need to lean the mixture some more, but see how it goes👍
@@tomdidit4216 i am 51 years of age you need 40 idle and 160 jet for 21 needle buy the go kart thermostat which opens at 55 degrees
Hi there T.T.G
I’ll be sure to check it out. Thanks for your comment.
I have a similar problem to the one you had in the video, specifically the part where the bike shuts off when accelerating. In my case it is a Yamaha TZR 125, when I accelerate to high speed the motorcycle dies to the point of almost turning off and in some cases it turns off, according to your experience do you have any idea why that happens?
Hi Chus
I’m my case it was the incorrect carb needle causing a rich condition in the midrange. The larger needle has leaned out the midrange on my bike, which has greatly improved the midrange.
In your case: Maybe try adjusting the needle position. Moving the needle up, by lowering the C-clip will (safely) richen the mixture. Go for a test ride and see if there is any improvement. If it is worse, then try to lean the mixture bu adjusting the needle in the opposite direction.
Good luck!
T
Do you know any info in the 28mm carb and needle to go for as I also have this issue. Nice bike very tidy
Hello there.
Thanks for leaving a comment.
Unfortunately I have not studied the 28mm carbs.
if you have a stutter in the midrange, my best advice is to try adjusting the needle position in both directions to see if there is any improvement👍
Cheers
T
hello sir!
Dellorto VHSB 34 LD - Standard 2T, Aprilia RS 125 (1994-1995)rotax122
Hauptdüse: 160
Leerlaufdüse: 40
Starterdüse: 60
Düsennadel: K 57
Mischrohr/Zerstäuber: DP 266
Schwimmernadelventil: 300
Schwimmer: 9,0g
Gasschieber: 40
or
Hauptdüse: 152
Leerlaufdüse: 40
Starterdüse: 60
Düsennadel: K 43
Mischrohr/Zerstäuber: DQ 266
Schwimmer: 4,0g
Gasschieber: 50
or the old school way rorax 123
148
K 56
DP 266
3. Kerbe
40 (Düse)
40 gasschiber
My setup is
172
k56
dp 266
kerb1 lowest
40 idel
40 schieber
with154cc polini and polini ehaust made for the 154cc kit back in the 90s! 25yeras ago deam im old!
and yes br10eg is standart for all 30-34hp models with rotax 122-123!!! dont yous 9 oder even lower!!!! 9 is ok for city driving. 10 is the way to go for some full speed rides. if you higher the compression and use 100oktcan + thing abaout a 11!
Hi Bravo.
Thanks for sharing this information!
I’ll be sure to try soon👍
Not a carb question , but wondering how you toggle dash settings ? Mines is stuck on trip 2 but it was in mileage , I can figure how to change it back 🤣 any help pleaseee
Hello Reid
There is usually a small black button under the indicator switch (left hand side). You will need to look carefully underneath👍
Press it to alter the display.
Cheers
Tom
Quick question what kind of changes do i have to do to be safe from a lean mixture during the colder months of riding ?
Hello Markuss.
I would listen to the engine. It may ping if the mixture becomes too lean.
Also, with the bike hot, replace your spark plug with new and check after 10 mins of riding. The colour of the new plug will indicate what’s happening inside the engine.
There are plenty of pictures online of what a 2 stroke spark plug should look like (with good mixture).
Cheers pal
Thanks a lot! 😁
Hi I put pilot jet 36 it was 40 and i put k21 on the stock 160 main jet and it still idle too high od idle if i want it to be around 2k rpm i need to open idle screw 2.5 turns i will order 155 main jet maybe that will help do you have any suggestions
Hi.
I am currently using a 150 main jet as it has been hot here in Sydney, Australia. The bike was bogging before but runs really crisp now.
I believe I’m running a 36 pilot , air screw 2 turns out. This seems to work for me👍
Cheers
Tom
Hi! We started to tune with your setup. Fixed the needle valve, closes correctly, but with the 160 main jet the air screw did nothing. We put back the 148 but it still does nothing. When we close the fuel tap after a minute it starts to run lean, then it revs with the air screw. Now, we know it melts the bike so that's not the way to try. We had a very dark brown spark plug, we've been told to lower even the 148 jet. The pilot jet was B36 changed to B35, seem okay. We were trying to mess with the float level, with your measurement it was less than 14. We've been told that hold the carb upside down, release the float and let it settle by gravity, then from the gasket surface it must be 11mm. Our is slightly bigger now. What should we try, and I can't understand how the hell could you set your bike up with these parts?
Hi Krisztián
Thanks for your message.
It took me many hours of trial and error to get my bike good with this carb.
Since making the video I have altered the carb settings again due to the rapidly changing climate here in Australia. My main jet is now 150 as it is now our warmer humid months.
I also experienced difficulty with the float level. This was causing me massive difficulties. Make sure the float is not sticking inside the bowl and causing overflow/flooding.
My current settings are
-B36 pilot
-Thick needle top clip
-And 150 main jet.
Do you have a new carb or an old carb that is restored like mine?
@@tomdidit4216 thanks for the update! I think the carb is even older than the bike🤣. We got this from an old AF1 racer, properly set with the 150cc cylinder, wasn't restored yet. Tomorrow I compeletly disassemble it, my car mechanic mate will ultrasonic clean ever part from any bit of dust. After that I got a new kit of seals O rings etc, it will go together with them. Many people said we got plus air sucked in somewhere, but tested with the brake cleaner, didn't rev so we guess no. We got a darkbrown spark plug with a 148 main and B35 idle jet, K21 needle ofc. In hungary the spring is starting, I'm usually tuning and riding in 20°C. You need the bigger idle jet and I think the bigger main too because the air contains less oxygen in Australia?
Run a BR10ES or BR10EG please!!
Tienes que poner bujia br10eg
Hi great video. Could you help with this at all. Bought an Aprilia it has a full arrow exhaust on it and 34mm carb it’s a 2001 rs. It will idle fine but when riding on brake ing it cuts out. It will also do this sometimes when releasing choke and go to rev it will die. Any help would be highly appreciated
Hi there.
Sounds to me like a carb issue.
It may need a clean? Whilst the carb is off, clean the air filter and box👍
Good luck
Tom
@@tomdidit4216 cheers Tom bath is brand new I’ll wip it off and see what’s what thanks again
Did you have to change the intake manifold?
hey mate , i’m based in Australia too and been watching your videos quite often right now as i’m about to get my RS125 soon . is there any social media platform that you could share so easy for me to contacting you regarding the bike issues and pro tip .
Thanks mate
cheers
hi, why are you using the 8 candle? at full power you have to use the 10s
Hello there. Thanks for your comment.
I prefer to use the 8 as it burns hotter and suit my inner city riding conditions.
As I understand, the cooler candles 9&10 are better suited for racing (wide open throttle) as the burn a little cooler.
I think either will work well👍
Thanks again for your comment!
Cheers
Tom
@@tomdidit4216 hi Tom, the 8 candle is for the reduced-power version, if you drive longer with the 8 you can get a piston seizure and you will never get full power with the candle, you have to mount the 10 for this. do you have your setup ready for the 34? I also ride 34 and mine revs perfectly without stuttering once, if you want I'll give you advice on the setup. Facebook?
hey tom , i have an 96 mp00 with rotax 122 .. got an 34 dellorto but my midrange between 5 to 6.5k is running shitty ... it stutters a lot ... i have 155 main b34 pilot and x25 needle ... any advice ? great videos btw !!
greets from germany
What notch is your clip on for the needle in your carb? And what are you running for air box / filter?
In my case, the problem you describe was caused by a rich condition (too much fuel in midrange) as the needle controls the midrange, I use a thicker needle to lean the mixture.
First try adjusting the clip on your existing needle to see is the issue improves. You may need to change the needle.
Wey dont you use a Lectron? No diasamply, only sqreuw the rod.
I have the same bike with all the same parts mines a 2009 I tried a k21 but if I was you I'd try the k52 way better for mine and gets rid of all the stutters
Tried a pod filter on it aswell tonight and runs perfect I have up jetted it too 160 instead of the 155 it was running
MrNathyboi, thanks for your messages.
Are you using the snorkel on the air box?
Mine is removed (when I bought the bike) and have never felt the need to install it.
Cheers
Tom
I put a piper x pod filter on it last night I did have a standard box with a Morley design snorkel but the pod filter is even better im now running a 160 main b36 and k52 on the top notch and it revs quick and crisp and pulls all the way with no stutters
Good to hear!
It just goes to show. Different bikes, climates and altitudes all play a part in tuning👍
Thanks for your comment
Hello tom can I ask you if I can contact you for asking some questions about the rs125
I come from Italy I’m sorry for my bad English
Thank you for your time
What clip are you using on k21?
Candle br8es? In my aprilia sx 125 (rotax 122) have br9es. You know the difference?
Hello there Enrico
In summary - operating temperature.
The BR8ES is hot, the 9ES is cooler and the 10ES (or equivalent) burns even cooler. The 10 works well at high RPMs and racing conditions.
As I understand, they are all suitable for the rotax 122, depending on your tuning and riding conditions👍.
Cheers
Tom
@@tomdidit4216 I didn’t know at all, thank you so much you are an expert
How much did you pay for dellorto 34?
What exhaust did you install?
This is an arrow exhaust that came with the bike. I should spray it black as it’s starting to look gammy…
Thanks for your message
Tom
What is the mileage of this bike brother.
How's the little RS running now, still at the same settings and running well? :-)
Yep running well mate👍
@@tomdidit4216 Sweet, I've had my eye out to grab one as a project, thanks for all the info you've put into your vids :-)
Hey so I'm 16 and currently have a moped but I'm getting a 125 in a few months as I turn 17 (A1 restrictions in UK) and I'm a bit unsure what to get because basically all top line 125cc are the same for example yamaha mt 125 and yamaha yzf r125 have the same acceleration and same top speed even with how different the style of bike they are.
So I was looking to get a honda cb 125r however the aprilia rs 125 is the only 125cc bike that i know of that changes the game due to it being two stroke
My question is that, is it really hard to maintain an rs 125, is it legal for A1 use as it has way more horsepower, just general comparison
Because I would love something with more power however I don't know if there is drawbacks
I hope you see this as I'm dying trying to figure this all out😂
My moped is 4 stroke so I have no idea about 2 stroke engines
Greeting Ellis.
Thanks for your message - I hope my response finds you well.
When Aprilia RS came out I was 16. It was a dream bike for me, however I could never afford one. I’m 39 now and had to get one. They are so much fun!
Understanding your current situation, if you are after extra power and some fun, there is nothing like a good running 2 stroke (in my opinion). Of course, extra power comes extra maintenance.
The Yamaha YZF125R and Honda would also be fun, reliable and make a great commuting bike due to the fact it is using modern 4 stroke technology etc etc.
It’s an exciting time for you. Wishing you good luck with the decision you make👍.
Regards
Tom
@Tom Did It thank you I really appreciate you're response this bike is definitely an option, just scared of two stroke reliability that's all
Well done Tom. Looks like you're in Sydney. If you decide to sell the rs125 one day send me a message. I use to have a mito and rs250 years ago.
Greetings ametti000
Thanks for watching and leaving a comment.
You are correct, I am in Sydney.
Good to hear you once owned a Mito & an RS250. Both awesome bikes! I’ve personally never rode an RS250, however I’ve heard they go surprisingly well…
If I decide to sell, I’ll be sure to drop you a line👍
Cheers
Tom
Hi Tom. Have you got the latter bike with the piaggio ecu or the earlier Nippon denso? I heard the later bikes have electronic restrictions and a catalytic converter? What are your thoughts?
Hi Ametti
To be honest I’ve not checked my ECU.
The last owner told me the Arrow exhaust and ECU came restricted as standard. But I am unsure of this.👍
Great video👍😀 i an rebuilding a old aprilia my self, i an looking for an arrow exhaust for my bike, but vant seem to find one online, maby you can help me? Know anyone who has a exhaust for sale ? 👍😀
@Paul Mickiewicz can you send me some pictures of it ?
Aprilia rs4 125 is slow is that can tune as fast as rs 125
Is every bike can tune? The aprilia rs4 125 like shit hp only 15 even top speed the top speed only 120kph. Can inc the top speed until 180kph and increase hp?
Hello Tan
Thank you for your message.
There main difference here is the 2 stroke engine and the 4 stroke engine. There are videos on YT that explain the main differences (if you are interested)👍
Long story short, small capacity 2 stroke engines will often outperform the 4 stroke equivalent. My bike in the video has a somewhat “tuned” engine.
To answer your questions- I don’t think the newer RS4 motor can match the performance of the older RS without spending big money.
That said, the RS4 is still a great bike for twisting roads etc etc👍👍
Hope this helps
Cheers
Tom
Bujia NGK BR10EG
Hello, is that the original exhaust?
Hello
Yes I believe so.
Hi Tom that's not running as it should mate I have been selling these for over 20 years different models same engine
Put your snorkel back on ! Full snorkel 36 pilot 155 main k57 on top clip will run perfect your problem is no snorkel
Luciano, thank you for leaving this comment and sharing your Aprilia experience. I have read that the air box snorkel provides sound resonance back into the carb, thus helping air flow. Is this correct?
Otherwise, my bike pulls so much stronger with the new and tuned carb. Not sure I want to try changing it….
I’m interested to learn how the bike sounds to you?
Thanks again for watching and leaving a comment. Very much appreciated!!
Cheers
Tom
@@tomdidit4216
Hi Tom I do run one of my rs125s with a piper cross cone filter but the bike is set up correctly or running polini 154 jolly Corsa exhaust etc and that runs spot on some say they don't run on cone filters but it's all about set up !
Anyway you will find if you put the snorkel back it will be even smother I can hear you still are not right in mid range
At end of day aprilia designed these back in my day with 34 carb and standard airbox
Put snorkel back in make sure it is full snorkel not cut down as some do !
2.5 turns out air screw 36 pilot
155/ 158 main start at 155
K57 needle top clip so leanest setting
You will feel it will feel so clean all way through and get 12k no problem
If you want really tune it
Go polini 154 / jollymoto Corsa 115 exhaust / 34 carb 160 main open cone / lightened flywheel port polini bike is crazy quick for one of these with good ! Reliability just change rings every 3k miles good for 10k bottom end
Remember to do good quality rod kit before putting polini
100% get snorkel back in I buy loads of these and young kids take them out they just run terrible and impossible to set up
@@tomdidit4216 There are 2 snorkels, low power and high power....
Ill be sure to try this ASAP.
Thanks for such and detailed response!!👍
Isn't the flat spot a CDI issue? and somewhat irrelevant as the bike really isn't happy unless running below 6500 and makes almost no power under that.
Samuel
Thanks for your comment👍
The stutter around appears to be a 6,500 is a common issue with this bike. I have read also that it could be the CDI unit - I’m my case it was the jetting. These days, due to warmer weather, I’m finding that a 150 main jet is working well.
@@tomdidit4216 yeah in Europe are least in the 90s and 00s the Italians purposely retarded the ignition at certain rev point to get around emissions laws. But it didn’t effect the bikes cos obvs they only get ridden above that RPM. Mine had a horrible flat spot from new but it was 4-5. Not as high as 6.5
How much ks - hp does it have
Hi Ivana
Thanks for your comment👍
My bike is down geared for acceleration, so it will probably go 150km
I’d guess the HP is about 30?
Cheers
Wood you sell the bike
Interested in selling it Tom?
Usas una bujia incorrecta... La bujia apropiada es la br10eg, lo dice el manual de aprilia rs 125 rotax 122....aprilia rs 125 full power br10eg
Aprilia rs 125 15 hp br8eg
Hello SPAINVENE
Thank you for watching the video and leaving a comment.
I use the 8 plug as it burns hotter and suits my city riding. I will use the 10 plug if I ever plan on riding the bike hard for longer periods or track use👍
Thanks again
Tom
ngk 8 thats for a 50cc scooter with 4hp or somthing like this!!! 125cc lawnmower with 12hp youse a 8! First your runtime is to short! the other thing is for what YOU are aming? Peak power for a dyno run or a street setup with some headroom. same setup with a 10 is black, but wiht a 8 its witht like perfekt on top! or you rich ore lean?
you are to rich!
chane only to a b10eg oder br10eg and know test it. but with way more time! start rich and than lean it out
Greeting bravo1412
I have since lowered the main jet to 150 and installed the snorkel - she now runs along nicely!
Cheers
Tom
👎