Four stroke carburettor synchronisation
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- Опубликовано: 26 сен 2024
- In this video I go through tuning the carburettors on a four stroke outboard motor. This includes adjusting the mixture screws to get the fastest idle, reducing the idle and then using a carburettor synchroniser to balance the carburettors.
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You're literally the only person on youtube that explain every detail!!! I've been struggling with syncing my motorcycle. This video helped immensely. MUCH appreciated.
This has by far been the most instructional, informative video I have found to date.
Thanks mate, hope it helped you.
I have the same motor as you so this video is ideal. Ordered an equalizer and a cheap digital tach at half the price of 1 hours labor of my marine tech so once I tune there will be no doubt that it is done right. Thanks best video yet.
It's always nice when you can buy the tools to keep and still have spent less money. :)
I don't even own a boat yet, but have been learning a lot through your videos. I really appreciate the clarity of your descriptions and speed at which you walk us through each procedure. When I find the right boat, I'll have a lot more confidence in surveying the condition of the engine. Thanks so much and keep them coming!
Thanks Sam. Sounds like you're going about it the right way to learn as much as you can before you choose your boat. Good luck!
You lay your money down, and take your chances.
Dangar you are the fking man! You have helped me with countless of your videos and if you are ever over to the US and down in Florida I'm going to buy you some beers and take you out fishing. Thank you for your time to help myself and others become more proficient with their outboard engines. To the viewers reading this comment, always look for Dangar's videos first when troubleshooting or preparing to fix your next outboard issue!
Thanks mate, glad the vids have been helping you. :)
Great comparison with tuning a guitar. Always a pleasure watching your tutorials especially with a stubbie in the foreground. Thank you!
My pleasure!
I have been a Marine Mechanic in Wisconsin for 30+ years. Nice Video and i use the stainless slide type sync from Carbtune. Ordered it from overseas. 100.00 bucks. Love it and nothing better then carbs synced after a tune up.
Thanks mate, glad you liked the vid. I'll have to check out the tool you are referring to.
Your videos on boat motor repairs are Thee Most Informative And Unmatched! I Always Enjoy Learning From You! Saying Thank You Isn’t Enough! Long Live, Dangar Stu⭐️⭐️⭐️⭐️⭐️🏌🏾♂️
I have now watched all of your videos, some of them more than ten times. I have a 1995 Yamaha f50 and to be true I have never seen anything as pedagogic and useful as this chanel. Many many thanks from Sweden. I owe you.
Hi Thomas, glad the videos have been helping you. Safe boating! :)
This was a great video and walkthrough!! the only bit of advice i would add is, when using multiple vac. gauges like that before you fine tune them its not a bad idea to check and see if they all read the same on 1 carb. sometimes those gauges can read a little differently but than after that you're set!!! great video!! new subscriber
Great tip Zac
Do you mean check 1 carb at a time ?
@@levibellette7726 no necessarily that. I just meant before you hook each gauge up to their own carb. check each gauge on the same carb first real quick! Iv'e had 1 out of 4 gauges read off before and messed up my whole tune! just a little tad of advice!:)
I use a mighty vac to test each gauge as a kind of calibration - 10” on the mighty vac reads 9” on gauge 1, 10” on gauges 2 and 3, 11” on gauge 4 - I then grease pencil a +1 on gauge 1 and -1 on gauge 4.
Did that make sense? Ha!
@@dekrev ahah yupp, very nice!. too bad you can't just turn the gauge faceplate so the needle all reads the same. good idea though!
I like your plane down to earth approach to everything
The best mechanic TEACHER on you tube.
Thanks Stuart!
I fixed my outboard by watching all your videos... Your the best!!
I just want to say thank you for taking the time to really explain every detail of what you are doing and explaining everything in simple terms.
Thanks mate, glad you're enjoying the vids. :)
I have a Honda BF40 that I purchased used, I have worked on a ton of Honda's but your videos are AWESOME. Thank you for dedicating the time.
Thanks Eric, you're most welcome. :)
Can't thank you enough with words for taking the time to make this video for us. Thanks Stu!
Thanks mate, you're most welcome. :)
Super explanation! It was very concise, direct and not filled with a lot of technical engine mambo jumbo. I understood clearly everything as you explained it. Now I can’t wait for the sun to come up and I can try it for myself. Thanks for sharing your experience and knowledge with us.
Stu I have watched soooo many of your videos. I can’t thank you enough. You’ve helped me do nearly everything for my Johnson and Yamaha outboards. Great work! Great info! Please keep them coming!
Thanks a ton!
I am just about to endeavor doing this very task and you have clarified it for me perfectly.Now I know how to adjust the fuel idle mixture as with 3 carbys to do,I was somewhat clueless as to the proper procedure.This video makes it look a breeze and just as soon as I rebuilt them I'll be getting stuck into them.It makes it look so easy!
You're welcome mate, good luck with the tune up!
Great video. I work on cars all the time and now I know this is well within my realm
Glad it helped
I dont know if boat motor carbs have similar stages as automotive carbs but if so here's another tip. When you adjust the mixture screws you are adjusting the fuel through the idle circuit. If the engine rpm increases significantly while making the adjustment the carb will begin to draw fuel from the off-idle circuit, thus upsetting your adjustment. Best to keep the rpm adjusted to an idle speed as you adjust mixture screws so you're working within the idle circuit. Also, it looked like your vac hoses may have been partially pinched at around 23:37. But, as with your previous video's, you are clear and concise, and very detailed. Good videos, thanks.
The most informative vid I've seen on this subject. Thanks for that! I love the plain, no frills vids that relay information. 👍
Thanks Joseph, glad you liked the video. :)
If a start my 75 mariner moter and it is running the fuel pis out my moter in to may transim of my boat
Lizaan van der Bergh bad reed valves if it’s a 2 stroke
@@lizaanvanderbergh6648 the carburettor/s are most likely to be flooding,, the float valves may be stuck down,, by the way,, too check your "reed valves are working right,, take off the air box on the carburettor's and run your engine holding a white card close to the front of each carburreter if any fuel is spitting out on the card then that cylinder's reed valves are bad,, not setting or are broken! if one is broken you MUST find all of the reed valve,, don't just swop out the reed valve without finding the broken part,, as it very likely to find its way into your engine when its running,,,, then your engine go's with a bang!,, and you get one written off engine!,, so find all the broken off part's!
Ur instructions are clear, easy to understand and what I appreciate most is you explain everything that is going on and why. I had idle issues with my mercury 40 after a carb clean and after playing with the idle screws I could not get it to stabilise. Either too high or it dies. Did not know there was a setting to bring the whole rpm down to idle properly. Subscribed!!!
Thanks for subscribing! :)
Thank you, it really helps me understand what to do. Not difficult at all. Providing you have all the right test equipment and fittings.
I've enjoyed viewing your videos tonight. They've given me that bit of motivation to soldier on.
I've just spent the weekend on a Yammy F100AET (F100TLRZ) trying to figure out why the alarm sounds then it goes into Limp Mode. After cleaning sensors & changing oils I've come to the conclusion that I'm gonna have to go in hard.... remove the head as there's water in the sump and milk running from the leg. Also while I had the Sump plug out and the flush hose on, found water dripping from the sump plug. Thanks Dangar.
Good luck with getting the motor back in shape. I hope the videos help you do that. :)
Dangar, I am soooo very happy to have come across your videos. I have learned a lot on how to tackle things that I would have paid for in the past. Just last night I replaced my SS reeds with carbon fiber ones. Again thank you for the viedos and the time that you put into them.
Thanks mate, glad you are enjoying the vids. I think a vid on upgrading to carbon fibre reed valves would be an interesting one, been thinking about that for a while.
I followed your procedure step by step for my bf25a and I gotta say...thank you so much for making this video...it helped me out so much when I had doubts about some of the screws effects.
Great video. It was very helpful on getting my carbs back to normal after I like many others grabbed ahold of the wrong screws when I was trying to drain my carbs when they were gummed up. Rookie mistake. Thank you sir.
Nice work! Glad the video helped you. :)
Thank You so much for your videos. I've been working on my sisters Mariner 45hp. These videos are so helpful. This started out as just replacing a bad Stator and turned into a Stator, Trigger, CDI, plugged idle valve on bottom carb. learned way more about outboards than I ever wanted to. :)
Extremely helpful and clear, really appreciate it. I really enjoy all your vids, thanks!
Thanks Andrew, glad you enjoyed it. :)
You are the most intelligent repair person i have seen..thanks man!!
Great video and great information about turning your carbs. I think that you have given me the answer to the problem that I have been having.
I need to clean the carbs on my 50hp Honda....Now I know how to adjust them... Thanks!! Your video was very informative...Well done!
Thanks mate, glad it helped you. :)
As a predominantly motorcycle and car mechanic who puts tools down everywhere I'm always anxious for you when watching your vids of tools or parts going in the water. ☺
Nice video mate.
I hear you brother, I'm always losing tools in the workshop so I try to be more careful on the water but it doesn't always go to plan...
I keep a large magnet on a rope for retrieving tools lost off the boat or dock, seems to work alright.
Thanks very much for your well done, clear, and informative videos! I just got a 90 hp 3cyl merc running that hasn't run for over 12 yrs. cleaned and new gaskets in carbs, rebuild fuel pump, all new fuel lines. It runs pretty well but has,what I'm told, a lean pop, that will almost stop the engine. So next I'll do all you have shown in this video. Greatly appreciate your videos.
Great vid on carbs. Always professional and most of all knowledgeable . Can’t tell what that means to DIY people like me great Job I feel inspired and excited and looking forward to getting back on the water with less stress or worries!!! Means a lot thanks Mate!!!
Glad to help
AWESOME!!! Thank you! Tthese videos have made me a lot more competent and confident to service my own motor. As a result, I've had a wonderful season on the water! Thanks again, sir!
That's what I like to hear. Glad you had a great season, I can't wait for ours to start! :)
@@DangarMarine , I imagine you are really busy but I can't seem to find the vacuum ports to put the synchronizer lines? 2005 Mariner 90hp 2 stroke. I've looked everywhere on the wen but nothing specific to my model?
That sir was the best explanation i have ever heard, thankyou very much
You're welcome, glad the video helped you.
Great video ! Super helpful ! Stu is my favorite boat tech on RUclips! You are very clever and I like ur style !
Really appreciate the competence and quality in your videos awesome dude
Hi Sir.
First class training video. Much appreciate. It helps me to understand the synchronization process with the tool, the small valves and the adaptors ... And your common sens tricks are great to know. Thanks, enjoy life ! Jeff
Thanks Jeff!
Fantastic informative vid, thanks. Trying to sort out the carbs on a classic bike and my next search was gonna be how to get the mixture right, but I think you've covered it. Thank again and keep em coming
You're welcome mate. Yes, the process is pretty much the same for a motorbike.
Best material on outboard tuning I've seen! I have a BF25 Honda that looks to be quite similar to what you're working on so even better for me. I've struggled a bit with this motor the last several years but the trend is positive :). Have had issues with dirty fuel and build-ups in the very small passages in the carbs so have, of necessity, gotten comfortable with disassembling / cleaning these guys. The final tuning / balancing however, has been a work-in-process even with the factory manual but your video puts it all together beautifully! Thanks much (and big snaps for not dropping anything in the water at the dock...I can't claim the same when working on the boat in the water :).
Thanks Mark, yep, those BF25s are very similar. Glad to hear the videos have been helping you, but yes, I have dropped plenty of tools and parts in the water over the years...
Dangar Marine Tappets
This worked like a charm. My BF30A purrs like a kitten now when trolling. Thank you very much.
The most helpful & nice video in RUclips!!! Thank you very very much!I slow down to 75% speed and saw this video 3 times. lol
Thanks, I have done that to my Suzuki GSX-F 750 with same type of synchronizer. Nice to learn more and now with boat engines.
Your videos are very informative and you go in great detail. I will use this information to try & get my motor set. Thanks for the descriptive tutorial... will follow and looking forward to more.
Glad to help
Super informative and so very helpful. Getting ready to adjust my own and this gives me the needed knowledge.
Glad it was helpful!
Thanks for this. I have a new (to me) 1998 115 Johnson running rich. I hope this applies. As soon as Hurricane Harvey is done thrashing us here in south TX I'm going to give it a go. Keep up the good work!
Thanks Charles, the mixture screw part should solve your problem. Stay safe in the Hurricane!
Great job on explaining that, and how simple it is with the right tools.
Thanks Bryan!
This is BY FAR the best video that I've found on this subject for the backyard marine mechanic. Thank you, you just saved me a TON of time, money, and cursing. Cheers from Canada! Sub'd and liked.
Thanks Alex, glad you liked it. :)
awesome video . i learned so much in 30 min. tomorrow i will do the same to my 60 horse mariner after a few upgrades.
Thanks mate, good luck!
I had a beast of a time adjusting a BF90. Two of the mixture screws had the tip broken off in the seats... I managed to drill them out with a magnifying glass and a dremel with a tiny, tiny drill bit. Installed new screws and redid the sync. Ran beautiful after that. It only took me a days work all in all :D
You are very knowledgeable and a good teacher.
Que capo que sos! gracias todos los videos que subís me están ayudando un montón! Saludos desde Argentina
Thanks again for your helpful Videos. Keep up the great work... From Germany
I absolutely love watching all of your videos thank you for sharing your knowledge
The most informative video I've seen on this topic. Thanks for that
You're welcome, glad you liked it. :)
The 86 people that gave you a thumbs down must just not like your accent. Thanks stu, very helpful
Man I have to say... Your videos have been so helpful. I have been working with 98 Johnson 60hp 2 stroke. Everything from the reed valves video to the card clean and sync videos. Keep up the good work!! Now I have to find the Vac screws on my in take and do a sync I have the motor running fairly good. Just some last fine tuning.
Hey Eric, glad the videos have been helping you. 2 stroke motors don't have induction runners like 4 stroke motors so this is more the procedure you would follow ruclips.net/video/NnotQmnKxKM/видео.html
On my 2006 merc 125 hp the it really idles hi and clunks into gear. I wasn't sure the idle was to blame but this vid narrowed that down nicely. While I'm not sure I want to start turning fuel screws I might just simply lower the idle as you say until is comfortably slower but not out of balance. Thanks Stu, very well explained video as always....cheers
For sure I would lower the idle if it is really clunking. As you say, no need to mess with the mixture screws if it is running nicely.
Good video. I learned quite a bit and ready to tackle tuning up my outboard.
Thanks mate, good luck with the tune up. :)
This video I felt was pretty cut and dry. Very helpful and it all made perfect sense to me. Thank you for taking the time to explain all of this. Great videos!
I really like your videos, you do a good job. Not to be "that guy" but: I had a Honda twin cylinder motorcycle 17 years ago, first street bike, and got all excited about stuff and found that I could balance the carbs (never had heard of such a thing prior to that). I bought a gauge/device and balanced them. I can't quantify it but it definitely seemed to run better and stronger after balancing the carburetors. It didn't turn it into a rocket ship, but it seemed to make an appreciable difference. I think it's a good final step in tweaking a carb engine.
I appreciate you sharing this with us, it really helps. I tried to mechanically (as I don't have a vacuum gauge rack; which I will need to get) sync the carbs on my Honda 40 by setting the adjustments as close together as possible according to the small holes in the bottom of the circuit (lined up according to the boss carb.) We will see if it works, I know it did work on my motorcycle to do it that way. My motor was all jacked up...I cleaned the carbs and reset the mixture jets. Next is the sync, thanks mate for showing me how!
Fun fact: Mercuruiser stern drives have an interrupter switch that actually turns ignition off for a few milli seconds as the unit is shifted from neutral . This protects the shift components in the bottom end. Works quite well. Don't know if outboards have similar tech, but they should imho.
yes of course outboards have a "shift interrupter" switch. if its a v4, kills one bank of cylinders so its easy on the pinion gear. a V6, 3 cyl (entire port or std. bank). anything smaller than a v4 and its not an issue. although many v4's dont need one depending on the gearcase.
I tell everyone to watch your videos you explain what your doing so well
Thanks Daniel!
I put my boat together from your vid’s I’m a expert now thank you
Brilliant clear explanation. Thanks. VERY helpful.
You're welcome!
I'll echo what others have said.Very clear explanations. I learned a lot.Thank's for the great video.
Thanks Tim, glad you liked it.
Very informative, thanks for making these boat motor videos.
I know this is an old post but thanks. Really Really helpful.
Glad it was helpful!
The ol’ “Fender noise”.. no dog around to blame it on hey ;) Grea video mate cheers!
Gday mate another brilliant video ,this was always something i would take tomy outboard mech ,1 i didnt have the vac gauges and 2 i wasnt confident as i had never done it before or been shown , brave man doing it over the water my luck i would have dropped all the screws and the screwdriver in .
Oh yes, I've certainly dropped my fair share of tools in the water!
Great video, very clear and easy to follow along. Thanks a million!
This video helped me get my 99 75hp Yamaha dialed in.
Very good video sir thank you from the 🇺🇸 North east!!!! 👍🏻👍🏻
I’m looking at purchasing a Honda 2006 Bf 40 tiller I’ve been told they are a good engine thoughts...?
Yes, those Hondas are very good engines.
You make the best videos! Thank you!
Thanks Paul!
just amazing , thanks very much,from Long Island NY.(Nino).
Very well presented even for the simplest of us
on most 4 stroke outboards, the bottom carb is (90% of the time) the "master" carb. if you start from the top one, your mixture screws will be all over the place, as demonstrated here by accident. a hint that the bottom #3 carb is the master is that it is not adjustable on its own. they dont want you messing with it. so adjust the bottom carb 1st, and i bet all the other carbs are within 1/4 turn of eachother. its also entirely possible he has a carb blockage as mentioned, but its idling so well i doubt that is the case.
Love your technical videos. I hadn't thought of it like a guitar string before, but its spot on! If you want carb exact, it needs to be adjusted everytime you use it, or if temperature or humidity changes...just like a guitar. I've just got a boat, but been mucking around with 2t dirt bikes for a while, good to know its basically the same.
carbs can last sometimes 20 years with zero adjustments if non-ethanol fuel is used. they are extremely reliable pieces of engineering on most brands and models, especially outboards starting in the early 1980's. temp and humidity will change this yes, but such a small amount it wouldnt be worth the trouble.
@@ct1762 yeah I guess it helps with outboards considering they are mostly used at one level (sea level or at a particular lake), so no need to adjust for altitude.
But 2t dirt bikes will always run better if they are adjusted for the conditions of the day.
You r top class mechanic,great videos.
Thanks Ronald, glad you like the vids. :)
Just subscribed. Easy to follow common sense tutorials on marine maintenance. Happy Boatie.
Great video. Thanks for taking time to explain all this information ...
You're welcome Duane, glad you enjoyed. :)
Is there no impact to the RPM's or lean/rich screw after adjusting the vacuum? Seems like after adjusting the vacuum you would need to recalibrate the lean/rich screw.
love your videos never worked on outboard motors before but hell these vids bloody neer make a machanic out of me thanks dangar
Thanks Tony, glad the vids are helping you. :)
For a doofus like me, you working on what looks like a Honda 50 (my motor) is HUGE! Thanks.
You're welcome. This is a 40 but the principle is the same for almost all four strokes.
I meant to add.......you tube is great but too many guys think they are media personalities or leave the camera on while they tighten a bolt. You get straight to the point and there are no 'dull' parts where I have to watch you spray paint the engine or something asinine. In other words, you are not just a good mechanic and a great you-tuber, you are also a great editor. Much appreciated.
Thanks mate. I know I go through quite a bit of talking theory in some videos but I try not to make them too boring! :)
Keep up the great work with these videos - they're a fantastic series that are really helpful for people that don't have a lot of experience. I have lots of carb fun with a Honda BF90 I have, where it sometimes drops to 3 cylinders when idling, despite stripping/cleaning/tuning/balancing all the carbs. They're temperamental things on the hondas I think, as my friend's one does the same thing, but not sure why it does this 'trick'.
Hi Jim, glad you like the vids. Dropping a cylinder is more likely to be a spark problem than a carburettor problem. I'd go through that side of this next.
Thanks for the input! Have used a spark tester on all 4 and it seems to work fine on them all whether it's going on all 4 or dropped down to 3, and have swapped the plugs & coils etc around. Just taken the carbs off yesterday anyway and the bottom one wasn't the cleanest inside (float was sticking, causing it to absolute p*ss fuel out of its vent at the top), so I'm overhauling them all.
Water jacket cover etc is all off at the same time to de-salt it all too, as a previous owner has clearly been pretty slack with rinsing it out adequately. Lots of new coolant related bits ordered as it's been a bit neglected. Now if I could just get the honda paint that'd be the holy grail but can't even really find it for sale in the UK, never mind the Isle of Man!
Thank you, you are very thorough
Somehow I just aquired a pair of BF50's one has a bum Trim Motor, the other has dirty carbs, thanks to you, I'll soon have 2 sweet running 50s :) ( on a 15' Boston Whaler, weeee).
Good score! Sounds like it's going to be a sweet setup once you've got it up and running. :)
This guy is awesome! Thanx for the great information
You're welcome Robert. :)
very informative with the service video and this one I don't see if your attentive what your doing you can't service any engine.
great videos 👍👍
Man your videos Rock! Very informative 👍👍.
I just bought a 93 Suzuki DT225 and it's giving me hell... I guess it would help if I knew anything about outboards but umm.. it's my first. I'm good with a wrench so with your help I was able to do alot of the basics to it but, it still stalls out and doesn't open up all the way ughhhh . Could u please lend me some of your expertise. Compression is at 130, 130, 130, 125, 130, 130, 115, 115, 125, 130, 130, 130
Thanks for all u do and please keep it up😎
I have buy de exact same engine, little iddle problems. Thankss! Voor the video👌🏻👌🏻
Great video, thanks for sharing. Your a good teacher!
You're welcome. :)
Your videos are awesome. Thanks bloke!
Thanks Josh, glad to hear you like the vids. :)
Awesome video. Very well explained.
Thanks Garrett!
Awesome, from Florida. Thanks!
You're welcome. :)
great job on your explanation !! thank you for making it simple!
You're welcome, glad you found the video clear. :)