Honda CT 125 How to make your own 142cc Big Bore Kit
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- Опубликовано: 18 фев 2021
- This video is about Honda CT 125 How to make your own 142cc Big Bore Kit:
Here is a list of all the parts included in the 142cc Big Bore Kit:
Honda Fuel Injector: 16450-K36-J01
Honda Cylinder Head Gasket: 12251-KYZ-901
Honda Cylinder Base Gasket: 12191-KYZ-900
Honda Cylinder Comp: 12100-K26-900
Art Piston: Engine make model: Kaze-125, Product # KAZE125-STD
Piston Rings: Serina Piston Ring Set: 13008-0006 Kaze125 STD 
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Thanks, Eddy, I've done my Honda Part Number Homework and the parts listed above fit as follows
12251-KYZ-J01 Head Gasket 2021 CT125A, 2014-2020 Grom, 2019-2021 Monkey, 2019-2021 SuperCub
12191-KYZ-900 Base Gasket Grom/Monkey/Supercub the CT125A uses 12191-K73-T60
12100-K26-900 Cylinder CT125A and Grom 2014-2020
16450-K36-J01 Injector Assy, Fuel is off a 2015-2020 PCX150A
All of these are currently available and fairly inexpensive about $121 Retail from our store that I work at in Utah.
Can anybody help me with finding these Piston/Rings/Clips here in the US?
For the rings, you showed part number 13008-0006 KAZE125 STD That part number is the rings off a Kawasaki Z125. Could the Piston also be off this bike? That would make getting all the parts a piece of cake.
Just did a google search and the bore size on a Grom is 52.4mm and the bore size on a Z125 is 58.0mm Does that sound like the right size bore for the piston you received in the kit?
Ok, the cylinder number you have listed is not the number for the cylinder we got and the base gasket number is also not the same. Could be the Kawasaki Z125 cylinder and piston, which makes sense that the hop up shops in Thailand have been mixing and matching parts to make the scooters here into little rocket ships. Recheck all the numbers I have in the description for this video. This has been a big help, thanks......
@@TrevPerry Sounds like this is what they have done. Kawasaki parts on a Honda....... Smart
@@TeamDNFracing I just checked again I just put the wrong number in my comment. I fixed it. Cylinder 12100-K26-900 Is the stock Cliinder from a CT125A and a Grom. I think it's just the stock cylinder bored out to a Z125 Piston and Ring? I've already ordered the Honda Parts and I guess I'll call another shop and order me the piston and rings. We are a Honda only dealership. Guess I better get me a Diablo Pipe coming and we will awaken the "BEAST" I'm the one with serial # 0666 Thanks for the help! Anyone else agree this is what is being done in this kit? 5.6mm bigger bore size is going to make a difference.
Thanks for the wonderful vid of the Bigbore setup. I have done a month of research. I have purchased two pistons from the various suppliers, ccd both piston tops, done the calculation and in both cases the compression ratio of these big bore kits is right up around 11: 1. With normal pump gas like 85 or 88 octane, detonation is certain, and it is only a matter of when, not if, as to when the piston says goodbye. ( Normal Hunter Compression ratio is 9.3 :1. ). For me red flags went up when I read on one of the suppliers website that you need to disengage the auto decompression system when fitting a big piston. Of course none of the folks selling this stuff will ever touch on these matters. The bigger fuel ejector and running a higher lift cam will help the issue, however higher compression develops more heat. I am curently doing the calculations fitting a stroker pin to the crankshaft and staying with the stock piston and fitting a longer conrod, to see if the compression will be lower doing it that way.Stroker pins are available and rods are as well. Hope this is helpful. Be careful everyone. Thanks
Another great video. The wrap on that bike is soo cool. I would have never thought of that.
You sir are a STUD! Thank you so much for all this crucial information!
With the help from some of the viewers, we are slowly starting to get all the components of a kit together.....
I really like the Bass paint scheme! I felt your sadness when the 1st mail truck came and it wasn't for you. lol. Happens here too. Lastly, I like how you stress on breaking these small bore engines in! Its how you break these in is how good and strong your engine will be over its functioning life! Enjoy the ride!
My little CT 142 is still going strong today. Almost 5,000 Kilometers on it and she has never let me down.......
Any motorcyclist who has been asked ,
How many bikes do you need ?
the answer is always ... MORE
great video , one of many you have shared with us
Someone just bought the blue CT125, so it won't be joining me on any adventures.......
Thanks! Appreciate your time.
Thanks, I like making the videos and have some very knowledgeable subscribers like Trev Perry whose post I pinned to the top. He helped me out by looking up the part numbers and letting us all know what numbers go to what products on the market....... Read what he has to say at the top of the comments section.......
Thank you for these videos. I'm getting into the Trail 125 scene and this information is very helpful.
Make sure you watch some of our videos of some awesome trail rides in the mountains around Chiang Mai, Thailand..... Great area to ride these really fun bikes in..... Thanks for the comment....
I have a 2021 Honda monkey and this kit sounds like something I might want in the future. I don't wanna touch the engine while it's still under warranty but maybe sometime After that. The bike goes fast enough and it's nice and quiet so it's just a thought. Thanks for the great channel it's very entertaining And informative.
You're welcome, glad you like the channel......
9:00 - Thanks for showing us the part numbers. I can show this to my Honda shop near my house in Japan. I als have a couple of other motorcycle parts and accessories shops that might also be able to help.
That is how you are going to be able to get this particular kit, is hitting up dealers and buy each individual part. The most difficult will be getting a Kawasaki sleeve stuffed in that Honda cylinder. It obviously can be done, but you better make sure you have a machine shop that can do it properly before spending the money........
Fantastic, Okes! This makes me smile. It's something a teenager would do!
DIY cubes to the max! :-)
Great video as always. I would be interested in this modification after I have a chance to get my hands on my Trail 125 here in Idaho. Still waiting. But with 2 feet of snow on the ground right now, I can wait.
I'm doing my best to get you guys set up with the same kit I've got. I'd get on line and see if you can order these parts and how much they cost. Don't order them yet, just find out the availability of them, then let me know what you find out so I can pass it along.......
I have just done some googling and got figures from Honda and Kawasaki websites so there could be some anomalies but the Kawasaki idea works with the maths. The CT125 is supposedly 52.4mm bore and 57.9mm stroke giving 124.9cc. The Kawasaki Z125 Pro 2021 is 56mm bore and 50.6mm stroke giving 124.7cc.. So in relative terms Honda longer Stroke for torque Kawasaki shorter stroke for RPM and power. Now mix 56mm Kawasaki Bore and 57.9mm CT125 Stroke and you get 142.7cc. I would expect it to be a Honda Barrel so it fits the crankcase, but what is possible is that the heat it up remove the sleeve, bore it out and slide in a Kawasaki sleeve. Wrist Pin (Gudgeon Pin in the UK) and circlips obviously to match the Kawasaki piston, Which may or may not have the valve cut outs already in it.
You nailed it right on. These little hop up shops here in Thailand have been doing this kind of power up grades for a long time. They know what works and what doesn't.... This one works...... Thanks for the info and the comment........
Excellent share!
Thank you.....
WOW COOL THANK YOU, THANK YOU, THANK YOU EDDIE YOUR THE GREATEST!💯👍🏻
Did you build a BBK with the info from this video? If so, let me know how you like it......
The 'Great Wall of Okie' is freaking cool. You should play movies on it and have all your biking buds over to have drive in on their bikes.
The taller piston will raise compression, only way to increase stroke is to lengthen the connecting rod. Really cool kit, thanks for supplying info your house there is georgeous! Your livin the dream.
Not sure what I was trying to say on that part, but you are the second viewer who called me on that. Sorry for the confusion, I know better, what I meant to say and sometimes at my age, my mind wonders a bit, but the taller piston will kick up the compression...... Thanks for pointing it out, that lets me know that people are watching the entire video which is good..... Again, thanks for catching that......
@frank gulla Lengthening the conrod does not alter stroke, it just changes the piston height at TDC and BDC. Also slows the piston speed. Manufacturers spend a lot of time working on conrod length to stroke ratio to prevent piston wear. The only way to change stroke is change out the crankshaft, or offset grind the crank.
@@ArchimedeanEye You are so correct, my mistake on that and I do know better.... Sorry for that.....
The Cylinder #12100-K26-900 from honda has a standard 52.4mm bore. ( so to get to 142cc the cylinder has been resleeved with a 56.00mm bore)
The way they did it with this BBK is to take the sleeve and piston for a Kawasaki 125 which is I believe 56.00mm. The Kawasaki has a shorter stroke on their engine design so they were able to get the 125cc by using the larger piston and sleeve. The hop-up guys here just utilized those two engines to combine them for the 142cc BBK. It works flawlessly almost. With the larger piston and sleeve, it creates higher compression which in turn can and does cause an engine knock do to premature igniting of the fuel/air mixture under extreme conditions. These conditions cause excessive heat and the pre-ignition of the fuel. We've been fighting this problem for a year now and of the three bikes we have the kits in, mine is the only one that has not developed the knock. The reason why is I've always used the highest Octane rated fuel I can get which is Benzene here in Thailand (it has lead in it). You can still get gas with lead here, but won't last to much longer as they are trying to get it banned. On the other two bikes which have developed the knock under high load rides, they have gone to having the head ported to lower the compression. I had my head ported shortly after having the BBK installed and added a Hot Cam and a new ECU from a Honda Wave 125i. The third bike is now in the shop getting the head ported, hot cam and new ECU installed with a re-mapping of the ECU. With these mods, the bikes will now easily run over 65MPH and have plenty of low end torque to ride comfortably in just about any kind of off road conditions we can find......
now ive just watched the first minute 30 of this and was gonna say youve done an allen millyard and are gonna make a v twin hehe - watching rest now :D
Now that would be a monster big bore kit.......
Thanks. You rock
Thanks for the comment, very much appreciated.....
iv had many Harleys over the years anytime i did pistons brought the bike home start it up fast idle for 5 min then let cool 1 hour i would do this for a whole day
Heat cycles, they just work great at breaking a bike engine in. I like your way of doing also, but it's fun to take it down the road also... Thanks for the tip, I may use it the next time.......
Excellent information and tutorial. I think to date your El'Diablo is the boss CT125 on the planet. Wow! The Bass Bike looks super cool. You could make that what I think they are calling City Version?Thanks for sharing 👍
Waited to long to buy it, someone beat me to it.... Should have gotten it when I saw it was for sale.....
aaaaand im at 2 minutes and without seeing the rest of the video yet all im gonna say is THANK YOU KHOB KUN - also you werent far wrong when you said UK lolol
Your welcome, just be sure to read the pinned comment from Trev Perry, he works in a Honda dealership and was kind enough to look up all the numbers to tell us what they go to.....
Shoot just fell in love with a CT90 my delivery boy was using. Now here i am tring to get a 2021 ct125 from my dealer to find out its back ordered. And to behonest i was hesitent because of the power plant then i look up on youtube all these bigbore kits for the honda grom which uses the same engine.
Here is a list of what gives the Honda CT125 some much needed pep: (1) Take the stock 39T rear sprocket off and throw it in the trash, install a 42T rear sprocket on it. You'll be amazed at how much this helps the snap down low and it only takes a couple MPH off the top. (2) Get a decent aftermarket exhaust system for it. A good one isn't cheap, so do some research before you lay out the cash. The one you see on my bike in this video isn't the one I run now, check out the video that shows me changing out the Diablo for the one I use now. It was a special order from a hop up shop here in Thailand and it works great. (3) Put a good Big Bore Kit on it, I'd only go up to the 142/143 cc size. The larger ones don't seem to have a very good record of lasting very long.... Do these three things in this order and you may not go past #2 on the list. I have two riding partners that ride with me now and Robert, has only the sprocket change on his bike and is happy with it. Daniel has the sprocket and a pipe and is happy with his. I love mine with all three done to it..... Good luck with getting the Honda CT 125 and thanks for the comment...... Read Trev Perry comment that is pinned on this videos comments. He actually did all the work looking up the parts numbers and finding out what all is in this BBK.......
Eddie another great video. We aren't getting the CT125 over here in the UK unfortunately but its interesting to research if my Z125 Honda Monkey could benefit from make up of your kit.
There are videos out there where they've done the BBK on the Honda Monkey and I would not be surprised if it isn't the exact same thing. Seems to me, they came out with a BBK for the Honda CT very soon after the bike came out......
nice one @trev perry - your nerd sorry lookups are very welcome :D
I can vouch for it that Trev did us all a big favor by looking up these numbers. I really didn't think to ask if anyone worked in a bike shop, but Trev stepped up and did this on his own...... Big Thumbs Up on this.........
I'd be happy to send the full kit overseas, lots of aftermarket here in Thailand are 1/3 the price of what you pay online.. during this worldwide situation doing my bit at zero profit, just happy to help our Honda Cub family.
If you are serious about sending the kit to overseas markets, then we need to get together and locate a person or shop in the US that would be willing to receive them and then the riders over there can enjoy what the BBK has done for my bike. The little shop that made my kit have now got them listed on Shopee for 1,850 Thai Baht. About 60% of what I paid for mine. Let me know.....
@@TeamDNFracing I have a friend in Pattaya that has an import/export licence, great guy who's willing to help, and yes an outlet on the other side would be easier and secure..
@@stella13661 I've got a lot of friends and now a lot of Subscribers in the US. Let me see what I can do about someone I can trust on the US side and I'll get back with you. Contact me on Facebook so I can put you down as a friend and we can talk on messenger. Look me up under Eddie Bright on Facebook, you'll see me on my race quad getting ready to go into a muddy water crossing..... Let's make this happen so the guys in the US can get some power out of their CT125's........
YESSSSSSS! Is this a thing yet?
@@bizkit365 Still nobody is willing to step up in the States to be an importer of the kits...... I'm thinking that if people want this kit, they are going to have to make them their self with the parts we have spoken about in this video......
Good stuff there! The taller piston does not add stroke. It's the opposite. But it does add compression. A shorter piston would increase the stroke.
My boo boo on that, the only way to add stroke is with a longer rod, which is not what happens here. The piston is larger in diameter which is where the increase in cc's are coming from. The cut outs in the top of the piston is because the location of the piston pin to the top of the piston is a tab bit longer, more compression. I do these videos off the cuff and do make mistakes on them. Someone will always catch it for me and mention it in the comments to the video. I'm human, I screw up, thanks for catching my boo boo...... Keep watching, there are lots of videos with my two bikes and more to come in the future....... I promise, I will screw up again, like Forrest Gump said: "It happens".........
@@TeamDNFracing Actually neither is true. Stroke is the difference between the piston at its lowest point and at its highest. That is controlled by the crankshaft and how far the big end bearing centre is offset from the main journal centre. So short of changing the crank or splitting it and fitting an offset big end pin it is fixed. Changing rod and piston may alter the position the piston comes up the bore but not the actual stroke.
We're still waiting for our bike, but I did get a new C125 Cub. Just curious about the piston in the cylinder. I would make sure the piston rings are spaced properly just in case. Good idea? Great stuff.
Just trying to find the parts to help out those in the US and Australia....... Hope this helps them......
Hi, just found your channel and watched a few of your videos :)
Watched your video where you tried the different front sprockets, was wondering if you have tried the 15t again since the big bore kit/new exhaust? Would be interested to see the top speed now there’s a few more beans in the engine!
Cheers, Sam
Actually, I just had the ECU re-mapped and a camshaft put in it. Thought I'd check out what it would do on top end and just could not find a long enough stretch of straight hi-way here around my house that isn't under construction or the road isn't super busy. With the Big Bore Kit alone, it still would not get up over 105 KPH but did it a lot easier than the stock 125cc engine did. Now with that info it will now do 93 KPH in third gear before hitting fourth gear. I'm pretty sure it will probably do around 115 KPH but won't be able to find out until the new hi-way construction is finished and I can zip down it safely. The bike really doesn't like the 15T sprocket for some reason so I probably will not be trying it again. It just accelerates so much better with the 14T.
A cursory internet search shows the kit available from Japan at an eye watering $691. This includes a sport camshaft and wiring for ECU, neither of which is mentioned in your upgrade. Can you shed light on this, Eddy?
Yes James, my kit did not come with the wiring or the camshaft. Another way to increase the cost. Here in Thailand, you have a lot of small shops that experiment with this part from one manufacturer and then another part from another one until they find what works and makes things go fast. That is how my kit was developed. The price for my 142cc BBK dropped down to about $60 US. The shipping cost on it would probably be another $200 US. Still a much better deal than the Japanese set up. There also is another Thai hop up shop offering a head, valves and Camshaft to add to the bike. Nothing else in the offer, so not going bigger in cc's but strictly head work. The Japanese setup sounds like it is from Takagima or Moriwaki. I've seen adds from both of them here in Thailand. Also, very expensive..... Hope this sheds some light for you and probably within a year, there will be some overseas shipper that realizes he can make a buck or two off of these kits and starts shipping them to the US, just haven't heard of one yet........
HI, great video. Just got my CT125 from Thailand. I am living in Philippines. I will be in Pattaya in March. Can you provide me a link on where to buy the kit as I can have it delivered to my friends place there. Thanks.
Hi Eddie, it looks to me like a bored out cylinder with a larger sleeve because, like you said, the sleeve doesn't look like it's thick enough in the stock cylinder to bore it out that large, so they must have started with a bored out cylinder and larger sleeve? That would be my guess. Also please, after you order the parts individually, give us the cost of the kit vs buying parts individually. And of course the big question will be, can we get the non-honda parts shipped to the US? the company that makes the kit won't, but maybe the parts manufacturer will? But who actually bores out the stock honda cylinder? That may be impossible to get shipped here too. I imagine it would be cost prohibitive to buy a stock honda cylinder in the US and find a machine shop that could bore it out and put in a larger sleeve bored to the correct diameter. Just finding the larger sleeve would probably be a nightmare or searching, or trial and error.
I found that Honda makes a scooter called the Winner.
It has a 150cc engine. I wonder if it shares the same cases as the 125?
I have not heard of that scooter, but they do make a scooter over here called the ADV150 which is what we use the fuel injector from for our BBK. That engine is a totally different design.....
Hey Eddy. Love these Videos. They are all a great time to watch. I have a question. Would the big bore increase the speed or the CT125 after all the heat runs? I've saved this video. I want to build this in Chiang Mai. Do you recommend a mechanic?
Do you live in Chiang Mai? If so, you need to meet up with one of us so we can get you into the group and we can help you out with anything pertaining to the Honda CT. The BBK alone will not increase the top end, but once you've ported the head, replace the ECU with a reprogrammable one from a Honda Monkey and installed a Hot Cam, it will increase the speed by about 20 KPH.......
@@TeamDNFracing thanks so much! Great information. Yes I'm in chiang mai. Let me get the new bike first and I'll shoot you the good news and we can meet up!
@@bearfightsninja Great, looking towards meeting you and introducing my riding buddies, Daniel and Robert. Look me up on Facebook: Eddie Bright. You can contact me on messenger there. My email address is teamdnfracing@yahoo.com
So, what was the final outcome on the cylinder? Do you just re-sleeve and bore it? anyone find the piston easily accessible?
I need to go back and re-read the comments for this video as there is a Subscriber on there that is a parts personal for a Honda dealership and he took the time to look up all the numbers I gave on the video. The piston is for a Kawasaki and the new cylinder sleeve is also for that same bike. What they did was to remove the cylinder sleeve from a stock Honda CT cylinder and then bore it out to take the new Kawasaki sleeve. The shop that built and sold these kits has it's own machine shop so they know what they are doing. So basically, the Honda sleeve is removed, the cylinder is then bored to accept the Kawasaki sleeve and it's ready to go.... The kit works very well, cannot complain about a thing with it and I've ridden it in all types of conditions.......
Great video thanks mate
We now have three kits in bikes in our little group. They are working great and each rider loves the results. We are trying to get the shop that puts these together "iTimgarage" to start shipping overseas. However, they for some reason are hesitant to do so.... Don't understand it...... Thanks for the comment.....
I will look up the parts from your list I mite need soon have just under 15,000kms up now lol
@@davidhuntington8687 Wow, it's going to take me another year to reach the 15,000 Kms on my bike. However, I may do that within a years time on my Triumph. Seems like I make a lot fewer rides on the Triumph, but the are way longer rides...... Planning on taking a trip down South to a friends place and I'm taking the Triumph, it's over 500 K each way...... Should be a good ride, I'm looking forward to that one.......
That’s great mate nothing like a long ride love riding my bmwf800gs on long a long ride I have just ordered front a rear rims for my ct125 and tyres so I have spare in case of flat was only $233 for each rim and $65 for rotor only $65 for rear and $40 for front
👍🏼
Looked up cylinder it's for 125cc grom. So it must be bored. Does your cylinder have a complete part number on it? Gaskets are available here. Need to check wrist pin length. Larger bore has longer pins.
I believe the wrist pin and c clips come with the piston.......
@@TeamDNFracing correct but I found piston separate. The cylinder number you listed is for a grom 125cc so evidently it will have to be bored or resleeved to achieve the larger bore. Hardracing.com has 143cc kits for $219....But they tell you that fuel delivery will have to be upgraded. Need fuel controller and A/F monitor. Changing injector does not chage fuel air ratio alone. I was thinking Maybe remapping ESU would help. But they say without controller and monitor detonation will take place. And timing advance needs to be removed. Hardracing.com the kit is for monkey. The kit is available with or without cam. They offer four valve head too.
You need to put a few drops of oil in the piston and cylinder to prevent this when you assemble it.
It has oil on it now and my mechanic will oil it up good during installation, thanks for the reminder......
Hi Eddy, the kit looks great and watching your later videos looks like it runs sweet! You mentioned that the manufacturer won’t ship outside Thailand? I’m in Australia, but do you know of any guys out there who will ship this kit? Seen one on Webbike but it’s almost $1,000!!! Post if you find or know of one mate. Cheers Mark
Wish I knew of someone here that has a import/export license who could make these shipments, but I don't. That would be the surefire way to get them in the hands of those who want just a little bit more power for the trails. I've been thinking about doing a 10,000 Subscriber give away and give a 142cc kit as the prize. The price of them right now is about $70 US. That's very affordable for sure...... Thanks for the comment and keep watching. I've been having downloading problems with my iMac since they did the upgrade on my video editing program and I've got some really good footage that I just got the part 1 of probably 3 parts downloaded. I purposely didn't do HD on the download to try and get it to send it. Just kept trying different things and finally got it sent an hour ago..... The rest of the series will be in HD though......
does this setup work with the 2023 gen 2 engine?
Sadly no it does not. As of now, here in Thailand there are no Big Bore Kits available for the Gen 2 engine. If and when there is something available that can produce some badly needed Horsepower, I will gladly report on it. The best thing we've come up with so far for the Gen 2 bikes is to change out the rear sprocket from the stock 38T to a 42T sprocket for a Honda Wave 125i. Luckily, Honda still uses the same rear wheel setup as they did on the Gen 1 engine bikes which is why the Honda Wave 125i rear sprocket fits. Thanks for the comment....
Maybe your Missus can export the kits?
She doesn't want anything to do with the bikes. Sorry, but I can't get her to budge on this one. I'm surprised with this information that someone in the US doesn't start putting the kits together...... The toughest part of the kit is to have a machine shop remove the stock Honda sleeve and install the Kawasaki sleeve. I think the iTimgarage group has there own machinist working in their main shop. It does take a few days to get the kit once we order one.....
Hi Eddie, Haven't heard from you for awhile. I tried emailing you but no response. On that package you sent, I never got it. do you have a tracking number?
Lon
Gents, I’m not seeing the PN# for the oversized sleeve. Maybe I’m missing something? Also, I wonder how tight of a pressed fit? I’m a machinist by trade, so I’m gonna give it a try. Thanks!
I do not have that part number. However, the piston is off a Kawasaki Z125, so the sleeve is probably off the same and then they pressed out the stock Honda sleeve and bored the stock casing to take the Kawasaki sleeve. If you are a machinist, I'm sure you can do the job. Let us know how you got all of it done and if the sleeve from the Kawasaki Z125 is what they used. I don't speak Thai, and they don't speak English so they really don't want to give up their secrets. The parts numbers that we did get, came from one of my subscribers, Trev Perry, who works in a Honda dealership in the parts department and he looked everything up for us... Just don't have the sleeve part number. Sorry.....
@@TeamDNFracing Yeah Just looked up the sleeve from the Kawasaki Z125 and it doesn’t look like you can buy it separately from the jug. I wonder if they are using a sleeve from something else? Thanks again
@@smg5960 Next time I'm close to the iTimgarage shop, I'll stop in and see if I can get some info from them. I'm wondering if Art Manufactoring who is making the piston for this kit also makes a sleeve.....
@@TeamDNFracing Yeah, you’re probably right. I just picked up my CT125 last Thursday. Man this thing is a blast!
Good video. Not to be critical but the larger dome on piston increases compression ratio and recessed for valve clearance. Stroke has to be done by increasing rod length. Factory piston is recessed in center for valve clearance and lower compression ratio. Art has been producing pistons for many years and are a reputable manufacturer . I believe webike sells those kits to USA buyers. Appreciate all the info on the parts.
Don't know what I was thinking with the stroke comment, I knew the taller piston increased the compression and just couldn't get it out of my mouth. We are finding out a lot about this kit now so be sure to read all the comments coming in. Trev Perry works at a Honda dealership and is being very helpful with the part numbers. Seems this is a mixture of Honda PCX and Kawasaki Z125 parts to get the desired piston size and fuel to the engine. The fuel injector is for a Honda PCX150, explains the more fuel delivery.
@@TeamDNFracing I'm confused how a 128cc Kawasaki piston gets to be a 142cc big bore kit? Like you said, taller piston doesn't increase stroke so no increased bore from that.
@@spydie Wider bore x shorter stroke.
@@johnfew5145 You aren't shortening the stroke unless you change the connecting rods, right? If you are using a 128cc piston, I still want to know what bumps this up to a 142cc engine.
@@spydie Correct, I was going to comment on the stroke comment, but others have done it and it was a slip of the tongue. The displacement is a combination of bore and stroke. If you half the bore diameter to get the radius you can then do (pie) radius squared to get the area and multiply by stroke to get the displacement. The big jump to 142cc by using a 128cc Kawasaki Piston is probably because the 128cc Kawasaki it came from probably had a shorter stroke and a bigger bore. Generally shorter stroke rev better and longer stroke has more torque. There is a possibility that this contributed to piston failure mentioned as putting a piston from a short stroke engine on a long stroke engine means it has to travel further on each engine rotation. Therefore for a given rpm the piston speed is higher.
were did you buy your big bore kit from ?? thanks
I bought my kit from an on line shopping network here in Thailand called Shopee and the shop that put it on line is called Itimgarage and you can check out their RUclips channel to see more about them. Problem is, neither one of these will ship overseas. From this video, you can make your own kit, so use the Internet and your local Honda and Kawasaki dealers to round up the parts. You will also need a good machine shop to swap out the sleeve in the cylinder.......
How much speed do you gain?
Thanks for the comment and to be honest, I've never tried to see how much speed it gained. Probably not very much if any at all. However, it gained in what I needed and that is low end power or torque. It will now pull all four gears where before it would struggle to pull fourth gear even on flat roads. Honda has purposely tuned this engine for fuel economy instead of power. The same engine is in several of their scooters and small bikes including the Honda Wave 125i which I had when I bought the CT125 and the Wave was much faster than the CT..... Hope this helps out.......
Making the piston longer is not increasing the stroke it is increasing.the compression ratio
Hi Eddie,
Haven't heard from you for awhile. I tried emailing you with no response. On that package you sent, I never got it. Do you have a tracking number? Thanks.
Lon
Lon, sorry man, but it is still setting on my nightstand by my bed. We live 20 kilometers outside of town, that is where the closest post office is. I have your package and one for Mitch Freeman ready to go. I only make it into town about twice a month and then I don't know my way around there. I hate asking my wife to drive me around as she has a lot to do here also. Yesterday, I asked here where the post office was, I had no idea where she was trying to tell me where it is. So, again sorry, your hat and brochure are not lost in the mail, they are still here with me and I finally braved up to get some help from my wife to show me where the post office is. It will be coming and it looks really nice. Again sorry for the delay, I'm not a city boy, I don't like big cities and Chiang Mai is a big city.......
@@TeamDNFracing Hi, Partner. Sorry to put you to so much trouble. I'm also sorry that things we take for granted (going to the post office) is such a difficult task in some foreign countries. Learning your way around a big city is very daunting at our age. We moved from a city of 1 million (Albuquerque) to a city in Wisconsin of 50,000, then to Carlsbad, Nm of 30,000, and finally are going to finish out our lives on 5 acres just 5 miles from our current town of 14,000. It just keeps getting easier to find my way around! LOL. I will be watching for the package, and thanks again.
My current project this week is setting up my new Mac Mini computer with the new Apple M1 processor. So far it's really fast and I think it will be a good addition to my family of four other Macs (three 27" iMacs and one older Mac Mini). I've been riding all my bikes a lot as the weather is warming up, but the rest of this week is going to be very windy and getting colder each day. We are not out of the 60s yet and might get back into the 50's in a few days. Can't wait for a steady diet of 70s and 80s for awhile, until it gets too hot to ride bikes (triple digits).
Lon
@@spydie Thanks for understanding, I have not forgotten you and Mitch. At least now, I know where the post office is. Working my Orchard during the dry season here is almost a full time job and yes, at our age, any work is not fun. I need to make a trip into town tomorrow, my second one this week now. That alone is unusual for me, very unusual. I have two little packages to go into the Post office and then I've got 30 bags of potting soil to pick up and ten bags of cow manure. So, the mail job gets done first because the other two are either dirty or shitty to do and those two CT125 hats are to pretty to get dirty or shitty looking. I'll be sending you an email when they are on the way. Now, I am taking time off from my Orchard chores because I have two videos stuffed into my editing setup (iMac) and I need to get them on RUclips. I have no idea how in the hell I ever had time to do a job before I retired, but since then, I've been on the go almost every day. That's a good thing, because I now don't have time to die, I'm too busy.........
@@TeamDNFracing I know exactly what you mean. I'm the busiest man I know (except for you, maybe! LOL). Spring is almost here and I'm already starting to get busy with yard work (even though my yard is a desert, I have lots of plants and trees to care for). This winter I started some Arborvitae trees from seeds. Now they are about an inch tall and replanted them in larger peat pots today and put them in my trailer behind my lawn mower to take in and out of the garage (out for sun, in at night because it's still cold). I hope to get about 25 of them to survive to use as west-wind breaks on the west side of my property. I've also got some fig trees to plant that came up nice inside the house this winter and a few other trees and things that I planted from seeds and now can't remember what they were! LOL. I keep pretty busy with that and my projects in the garage an on the computers. But I'd shrivel up and die if I didn't keep busy. I get bored easily if I don't have anything to do. Right now I'm also researching wifi 6 routers as it's so much faster than wifi 4 and 5. And I have one computer and two cell phones that both have wifi 6 capability so it's time to move up the food chain as everything you buy now will be wifi 6 compatible. I've got three computers that are wifi 5 compatible and one that's older and can only go to wifi4. Take care and keep busy gardening and riding.
Can the wife do the business 👀
Nope, she has a full time job taking care of her invalid mother. There just is no option for us to go into business of any kind here. My Visa status is very important to me and I won't jeopardize it for any amount of money.... Sorry. Check with Beez Deals about getting what you want shipped to you. She is a Thai lady that does a lot of accessories for all sorts of small bikes and I know she ships to the US.... Hope that helps, but I like living here to much to risk it.....
Hey guys anyone got the full list of numbers they can send me please 👍🏻 cheers Keith - if you need an e mail address let me know 👍🏻
15:21 - So, then maybe I can't get this kit in Japan. Well, I'll ask about it, anyway.
This kit is put together by a very small speed shop here in Chiang Mai, Thailand. They've done their homework on what works and what doesn't, but they only put one or two of these kits out each month and they will not ship out of Thailand. The part numbers are here for anyone to try to get the parts for themselves and then install the kit. I'd like to see everyone who wants to put a little pizazz in their engine get ahold of a kit, but sadly, I just don't think very many will get it.......
@@TeamDNFracing Yeah, it seems like I might have trouble finding the kit. I'll give it a shot.
@@juliusevola3729 I wish you luck. If you can get it, you'll love the performance it gives......
@@TeamDNFracing Thanks. I was going to ask you if you noticed much of a difference after putting in the kit.
LOL, FOR ALL THE PART #
Let me know how it works for you. I have had no problems with mine and it really improves the performance of the little engine......
It's gonna cost you as much to buy the parts as it will to just buy the kit.
The problem is, they don't sell these kits but maybe two a month, so if you want one, you've got to see it advertised and act quick to get it.......