Two stroke carburettor synchronisation
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- čas přidán 13. 07. 2017
- In this video I synchronise the carburettors on the Yamaha 20HP outboard. This involves getting the throttle butterfly valves to be set evenly at idle and fully open at full throttle.
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To this day, still the best educational outboard videos out there! Fixed my "Sneezy" motor problem as well!
Thanks Thomas, glad to hear you got your engine fixed up! :)
Finally found the solution to my sneezy 25hp yamaha. I would definitely put Yamaha in the title, as there arent any other videos for
Glad it helped!
i watch this a swcond time bcs i have a dual carb on my dle... and this is basically the most understandable and easy explanation without any snake oil myths at all...he is good!
That's what my Yamaha 40 Hp was doing when I bought it used. Did the carb clean, fuel tank, lines, plugs and still was the same. I saw this video and noticed my butterfly valves were uneven, checked my linkage that controls them and notice that they were upside down. So the entire time all I had to do was flip the linkage. But your video made me check those valves, and sure enough it was so simple to fix. Thank you so much from Victoria B.C. Canada
The joys of being a mechanic, is that we learn something new every day, and we need to be open minded, as I have learnt how to fix issues from the strangest people.sometimes the old bush mechanic can teach us a thing or two
Good work well done, gold coast Australia
For sure, there is always some new trick to learn that comes from the strangest places!
This is the best or possibly the only video how to cure a sneezing Yamaha 20-25HP outboard engine!
My 25HP Yamaha from -93 did exactly the same sneezing thing, and it's now running like it was new, thanks to your excellent instructions!
Thank you for posting this! I'm truely greatful for your efforts! Also your video about tuning the fuel screws at idle helped me get my motor running like a charm!
From not being able to go hardly anywhere with the boat, I'm now able to actually make longer boat trips with the family! :)
Thanks mate. Great to hear you are now out and about enjoying your boat. :)
Thanks for the acknowledgement. I appreciate it. I tell my customers to watch your vids if they want to learn a little about outboards. Keep up the good work.
Ha! That cracks me up. Ive been to Philly. Twice. I believe I've seen the Liberty Bell, went up the Rocky steps, and had a cheesesteak. My quota is filled.
...an excellent teacher. Thanks for all the time you put in dangar stu! Subscriber forever!
Bought a 1981 Yamaha 55B and in short - I tried to make it run without success - watched many youtube videos - finally found this one - and a day later it is running. Thank you for to the point instructions. Waiting for 2021 boating season here in Finalnd.
Great to hear!
i loved this little series on the single outboard. Would love it if u made more videos of knowing how to diagnose issues then fixing them on that outboard, but also keep up the more specific videos separately. Loving all your videos
Thanks mate. Going to be doing a bit of diagnosis on a Merc 110 9.8 that won't start today. We'll see where that leads us.
had this issue on single carb 25.
literally the butterfly screw fixed it.
cheers Stu. great video as always.
Awesome video!! Thanks for sharing, love this series. I have been using them to service an old yammy 20hp and the motor is now running great!
Been following your channel for sometime, really enjoy how you explain things.
Awesome, thank you!
You are the best at explaining things..i always learn a lot from watching your videos.
God bless bro.
So nice of you. :)
Never in a lifetime would thought that! nice video , i'm very happy to see it fix
I must admit, I was surprised to see how badly it ran for such a minor problem.
Thanks Stu; What a thorough how to video. very easy to follow. God Bless.
As always, so informative. You just simply are the best
I appreciate that!
Presented in an easy to understand manner, as usual. Thank you.
Thanks mate. :)
Great video. I’ve been sitting with exactly this issue on a similar model 25hp Yamaha. Exact same setup. Going to go through this and hopefully get rid of the sneeze
Awesome video! I truly appreciate your time in making these videos. Thanks!
Thanks mate, you're most welcome. :)
DAMN YOU !!!!! Your videos are so good, I spent another 2 hrs on this damn computer!! I don't know if I should hate or love you. I'm confused but I know one thing for sure, I wish I had a shop instructor that was half as good as you. Please keep up the videos, we need people like you.
Thanks James!
Now my 2 friends are watching also. I actually learned more from your videos than anything else. You're truly an awesome teacher and your passionate about what you do. I'm rebuilding a 98 sea ray searayder jet boat. I hope you do something on jets sometime cuz you got 3 big fans right here.
Excellent video - this is exactly what I needed to know how to do on my newly acquired Yamaha!
Thanks mate, glad it helped.
What a great series. Thanks for uploading, really enjoyed it
Thanks mate, glad you enjoyed it.
Great find. This is a prime example of why you consult a professional for repair. I would have went toward the fuel pump. It's your experience and knowledge that shines in these type of repairs that in the end costs less money because you know where to look and diagnose. Well done and great video!
great video just shows how much that can effect the running of it very useful
Hey danger, can you make a video of adjustment in the timing on 25/30 yam 3 cylinder? There is not any video of these motors. Thank you very much man, you do a awesome job education people with your videos
Another awesome video, glad the motor is running
Great video, I enjoyed the whole series on that 2 stroke. thank you!
Thanks Travis, you're welcome. :)
This video is very helpful to me right now!big thanks.I just cleaned all 3 carbs and each carb has 2 floats it’s more like 6 carbs!now it’s time to sink them all!Ill keep watching this video a few more times 👌👍
Glad the vid helped Bruce. :)
I found out the bigger problem that I had!Im wounding if you agree?all the rain we had for two week here keep the pump and flit switch running a lot!right after that my motor would turn over for a while then die and never start.my two deep cycle battery with a 20watt solar set up did not keep up.too small,the 225 hp on my 19.5 boat did not have enough spark to tune over this motor needs very high amps to not just make the starter run but all the other electric ignition components!nothing worked except two new deep cycle battery.I tried to make a jumper start switch like in one of your videos and it turned it into a electric welder!lol this big old motor needs amps!I need bigger solar panels 👍or less rain ,one long week of fun this has been!all for a 50 mph fishing boat
Awesome Stu, glad this one doesn't have a cold anymore. interesting carb setup on this one. my merc has less moving parts to deal with but the sync is the same. glad it was an easy fix and not a major one.
I was pleased too when it started running nicely. Time for it to go back in the water!
Love the Yammy 2 strokes,great motors n easy to maintain.
This is gold dust info to the learned outboarder like myself - Thanks 😊👍
Thanks mate, glad it was helpful!
Very good series!! I am excited for the Johnson 40 videos you mentioned at the end- that's my trusty motor
Great video and very educational!
My Johnson 110 was coughing and getting hard to start so I took the carbs off and cleaned them. Starts better but has a slight cough but not as bad so I’m going to look at the butterflies like you did and figure out the rest seeing the carbs are different. Nice video good details.
Great diagnostic series 👍
This may come into use. I’m looking at a 1989 Johnson 25hp, the motor has that 2 stroke sneeze when the guy fired it up after it’s sat for a year. Compression is at 140 in each cylinder, new spark plugs. But on your previous vids of this Yamaha some things I would have never know to look for, so thank you!! I’d like to get a Yamaha instead, but here in the states they are a fortune used. Johnson and mercury is not to bad priced used. The average price for either of them is about $800-$1500 anywhere between 20-30 years old. The Yamahas used are between 20-30 years and they want $2500 or more. Supposedly there’s more parts for older Johnson out there than older mercs. We shall see.
Was really expecting the manometer to come out for this one. Really informative video, thanks.
Manometers are used with four strokes where you have an intake manifold vacuum to measure. You can use a flow meter on the front of the carburettor though.
@@DangarMarine You're absolutely right :) Been a while between jobs for me.
Great information as always, thanks!
You're welcome John. :)
Superb series of videos 👌
Great video.
Nice work Stu.
Thanks Will!
Great job. Keep up the good work.
Thanks Jethro. :)
Great series!
Thanks mate.
I enjoy your videos!
Thank you!
Great video. Big help.
Glad it helped. :)
Another excellent video and explanation, thanks Stu, John
Thanks John!
wow, had no idea carb synchronization could cause that lean sneeze condition. I was getting anxious when your last few videos didn't find the issue!
I too was surprised to see what affect it had on this motor. Apparently this particularly motor is very sensitive to carb synchronisation.
amazing videos man !
Thanks Jason. :)
I have a Suzuki DT 55 that shows exactly the same issues. I also know that the center carb throttle plate is fractionally ahead of the other two. Stupidly I hadn’t considered this to be significant enough but I’m ready to get at it. Thanks, I’m feeling more confident that I may finally solve the sneezes.
I too didn't realise what a bit difference it would make.
Update; I just followed your tutorial on my DT 55 and transformed my slow running issues. Thanks, you truly are a very valuable. Source of information !!!!!
Thanks Stu.
Welcome. :)
Yamaha has this problem, and it was also in the RD-400 engine, sync the carbs or it won't loft the front wheel.
My family saw me riding that bike several times, my old man remarked about only one wheel being used at any one time, I think that is why two strokes were discontinued, it wasn't about emissions.
I had fun with that bike, I also really liked the Kawi H-2 triple two stroke, that thing was a screamer.
That H-2 went 11,500 rpm in third at well over 90 inside the school parking lot. The RD handled, the H-2 went well in straight lines. H-2 didn't turn worth a damn.
So impressive you foundthe problem, im actually having the same problem but with a 15 hp mercury 2 stroke. just one carburetor though, which i rebuild, but still the same problem. I am working on outboards myself for over 10years now but never came across such a problem. It's true that 80% is a dirty carburetor, but this is just insane. I got a vacuum leak via the butterfly axle and mechaniced the shit out of it, blocked one end off and an 0-ring on the other end so it leaks no more and handles exactly the same... this is just insane.
Nice work Stu, Beer time!
Definitely beer o'clock!
I’ve got a 40 that’s sneezing badly so fingers crossed this helps
I knew it lol. Actually I was expecting the bore of one or both of the carb butterfly shaft(s) to be worn. It still great showing how diagnostic leads a person around like that. I once as a teen rebuilt a car engine because I thought I had a head warped.. Turned out a line to the turbo after all of that. No worries though because it really was due at 230k miles I guess.
Thank you for the information. Great video as always. Do have a question. Should you tune the carbs with the air box on or off?
It seems like the smaller the motor, the more important it is to have the carbs synchronized. I know its bad for all motors but seems there isn't as much wiggle room on the smaller motors. Great job as always Stu!!!
I think you're on the money there, small motors do seem to be more sensitive. About the only motor I could never get running no matter how much I tried was a chainsaw.
Dangar Marine Haha Stu. Its crazy you just said that. I swear to god right now Im in my Dangar Marine shirt cutting a big broken pecan tree with a Dolmar chainsaw that i got running but I can only get it running at a crazy fast idle that scares the crap outta me. Pouring sweat in this hot louisiana weather. Too cool you said that bud!
Thank you Stu, I was eagerly awaiting this video. More good work. Greatly appreciated.
I will be down your way in a month or so, where is your workshop, is it at Brooklyn, I am thinking of paying my debt for all the info. Cheers, Bruce.
Hey Bruce. The workshop is just a little bit towards Sydney in Mount Kuring-gai. It would be great to see you. :)
Stu, you had better email me your address and a phone No.
alanvale at gmail dot com and I will send you my details also.
Interestingly my mate lives at Berowra, just next door to Mt Kuring-gai
Cheers mate.
great video as always...can'twait for the 40 johnson....love the evinrude johnson omc motors....just can't kill them
Thanks mate, but unfortunately the video on the Johnson is diagnosing why it died...
Dangar Marine lol ok ...well insert foot in mouth lol....I still like them....and still look forward to the great videos...
thanks
Bloody excellent series of videos - if only I had access to material like this back in the 1980's when I had my boats. What did we do before the interwebnet, eh??
We paid up the A$$ for some joker to lie to us about replacement parts..
grate video Stuart
any chance in the future of a video checking four stroke valve timing
Hi Stu, my oldest son has a small older merc 2 cylinder 110. I think it's a 9. something hp. he brought it over for me to help him change the impeller but has other issues. I will gopro this week for fun.
Good luck with the job! :)
I’m going to go try this on my 78 115hp Evinrude tonight. She bogs spits and dies at low idle. Cleaned the carbs and found rubber under the float needle seat AND low speed jet was plugged with the same type of rubber. Was leaking fuel all over and wouldn’t start. After the carb clean, new fuel pump, new fuel lines the motor now sputters and dies. Hoping it’s just a loose connection like you show here. I think I remember looking into the butterfly chamber and saying to myself “ hmm it’s not closed all the way AND it won’t open all the way”. Didn’t do anything about it cause I didn’t see this video yet!! Thank you. Hope this is what fixes “The Little Bogger”.
Good luck mate, I'm sure it will help a lot even if it isn't the only problem.
Hey Stu, another great and well made video!!! I am trying to understand how the "out of sync" carbs could have this effect on the motor!?! Obviously it did but can't comprehend fully.
Haven't seen the Green Machine in a while, all good I hope.
Cheers
last thing i would of thought of how ever good tip to know.
Yes, it is surprising the effect is had.
i have a yamaha 40hp 3 cylinder from 1986 with this "sneezing" problem on the third cylinder, it revs up fine but at lower rpm and idle it sneezes.
carbs are clean and reed valves looks good
mate why didnt you just sync the carbys in the first place ,,,,JUST KIDDN,, loved the video,,always so informative,,,one of the best videos,,,please keep up the fantastic work...I did have a problem with a slugesh motor,,it was a leaky fuel pump diafram...hopefully we will meet one day as i fish near were you live...take care friend.....cheers Brett
Thanks Brett, glad you've been enjoying the vids. Hope to see you out of the water one day!
otimo video, muito obrigado.
Seja bem-vindo
acredito ter conseguido ajustar os carburadores do Yamaha 60 Hp 3 cilindros, graças ao vídeo que você vez.
In this series I learned so so much. Its 1 a.m. and its worth of being so tired. But I couldnt stop watching all the episodes around that little 2 stroke.
Glad you enjoyed. :)
thanks so much for the lesson. question: At 8:20 you say motor is hard to start, so you add more air by opening the butterflys. Isn't a closed butterfly the same as a full choke, which makes it richer and easier to start? And what is the choke mechanism? Obviously it worked, but why? Motor was warm from many video takes?
Hey Dangar Marine .. Your videos are really good ive subbed and subscribed..I Just came home from doing a link and sync on a F150 at YAMAHA MARINE UNIVERSITY in Atlanta USA and my question is that the instructor told us that it would be best to do this in the water or a very least in a bucket.. I was just curious is it would make that much difference with a load on it.. We had to adjust the TPS to Meet the ISC request at around 42 degrees.
THanks for you videos again. MiKe.
Hi Mike. Trust me, you probably know a lot more about these big Yamaha's than I do! This motor doesn't have any idle speed control other than a simple set of mixture and speed screw. These definitely need to be adjusted warm with the motor in the water but I don't imagine it is so important when adjusting the relationship between the butterfly linkages. Would be interested to hear what your teacher thinks though.
Great, I still don't have a specific date yet but will let you know in due course.
Keep me posted.
Your vids are so addicting I binged-watched this yamaha story... and I don't even have a yamaha! But it did bring up a question for my 1995 200hp Evinrude. In order for it to run smoothly, all six carb screws need to be backed off 6 1/2 turns. Seems excessive but it's the only way to get her to run nicely. Think the amount of screw turns are affected by something else so I can save some fuel? Thanks for the knowledge.
👍👍👍 you rock!
Thanks mate. :)
Awesome Stu. I had no idea that these engines were that sensitive to carburetors not synchronized perfectly. I definitely learned something from watching this. Is it possible to remove the carbs for cleaning and not disturb the sync settings?
I too was surprised how much it upset the motor. I can't imagine things being too far out after putting the carburettors back on.
Dam good video ,
Thanks mate. :)
stu you're the man if you were a little bit closer I would get you to work on my motor but I'm all the way in the US
Send it over via DHL. I'm not sure if UPS or FedEx could get it to Australia.
Anything can happen for a price. ;)
I have learned so much by watching your channel! thank you Sir.
I have a 50 HP Yamaha 2stoke that keeps getting clogged jets. almost immediately after cleaning. I have replaced all fuel lines, filters, fuel pump, and ran it on a separate fuel tank. My next step is to replace the spaghetti gaskets or orings inside the carbs. they have some type of gel stuck to them. it was like this when I bought the boat. have you ever seen these gaskets cause this type of problem?
Once gaskets and o-rings start to disintegrate they can certainly cause these types of problems. It's good that you have changed the fuel lines as these are a big cause of trouble once they get old.
Wish you was in tennessee in usa..we need someone like you here..you care about what you are doing..i see that very easy..did you go to lots of training..or did you educate yourself..
God bless
great video :) u planning to do any videos on the tohatsu 50 2stroke automixing? heard they are similar to the yamaha autolube "series"
Thanks Kristian. I do have one in the shop at the moment so I should look at doing a video before it goes.
Good day sir. I'm a fairly new subscriber to your channel. First of all I have to say you your videos have helped me tramendously. I have what I think is a 1988 90 hp 6cyl Mercury outboard with 3 carbs. I have rebuilt the carbs new coils, wires, plugs, compression on cylinders is 150 lbs almost dead on in each cylinder. Number 5 cyl is acting exactly the same as the cylinder in this video. The only things I haven't done that you have in this series. Is the head gasket, and the Reed valves. Before I do that. I wanna time the engine, and sink the carbs. My question is. Does the same procedure apply to my engine as this one. Would the carbs be adjusted the same way, and have never timed an outboard engine before. Any help you could give me, would be extremely helpful. Oh by the way great videos on the electrical set up on the green machine. Got my 76 Marquis wired up perfect thanks to you.
Hi Brian. The principle of the carb sync is the same, I just can't picture what the adjustment options are like on the old Merc. From memory timing adjustment is quite simple on those older Mercs using a timing light.
A quick question if you have the time, with my V6 2005 150HP mercury 2 stroke, I've noticed it has 3 carbs fitted but i'm assuming each body contains 2 carbs (so 6 all up) that I'd need to sync using this method ? I find your video's to be very informative and your method of presentation makes it easy to understand, and gives me the confidence to tackle this job. Also how would I know if my outboard was running rich ? is it simply by ensuring that the mixture screws are set to factory settings and thats it ?
Have you ever dealt with envinrude Lync and sync? PS Im happy for you that you are now back in the summer season
Yes, Ron here on this channel once showed me his technique using some stiff wire soldered to some alligator clips to amplify the movement of the linkages so you could remove any play from them and get them all moving at the save moment. It is a technique that is well worth a video one day.
this same this is happening to my Mercury 40hp 2 cyl. 1 carb.. cleaned carbs and fuel lines, same spark plug issues, same "fix" when one wire pulled.. but I only have one carb..
I synchronized my carbs I have a 48 hp envinrude 2 stroke, when start it up does really good but next day when trying to start it up it off again wonder why.
Awesome video as always! If your fuel pump automatically mixes both oil and gas (VRO pump), what is a good way to test the mixture is correct and the VRO pump is working correctly for both oil and gas? Can you pull fuel from the bowls and somehow validate the mixture?
Probably the easiest way is to put it in a glass container than slowly add oil to a second glass container until you get the samel colour.
Good job I was going with the left tire next time. Peace tight lines and be safe out there.
Thanks Coop!
Dangar, are you still posting material on the web? Really appreciate how you explain things. I have an Evinrude VRO 140, and I think I have a carburetor throttle linkage issue. Wish me luck! thanks man!
Yes, still posting, but less outboard stuff these days. Good luck!
so you do a visual synch on the butterflies and chokes...and then an rpm synch on the needles...that takes less than 5-10 min. drinking coffee while doing! 👍😉cool...i watch it a secomd time to get it memeorized for ever...who knows how long we still have internet in our idiotic times!
What camera are you using that zooms so well
Is the mixture settings the same for a 30hp (30D) two stroke Yamaha, 2016
Just did this to my old Yamaha. Stripped and cleaned the carbs, they always needed damp start to get it going. Put them back together exactly as they were, started it with no damp start (yay) but had this same issue. Followed this video, brilliant, fixed it. Cheers. One question, is it wrong that it runs better with one of the mixture screws screwed all the way in? The other one is 4 half terns out at the moment. Thanks again, brilliant instructions. Keep em coming.
Hey Malcom, it is a bit odd that one is screwed all the way in, it sounds like that is compensating for a problem but if it runs well I wouldn't worry too much.
Dangar Marine. Hi Stu, thanks a lot for your reply. Next time I'm out I'm going to have another play around with the mixture screws just to be sure this is the best setting. Great videos. Cheers
Well, that was easier than I thought it would be. I figured you would break out a mercury carburetor sync tool. But then, I didn't see any vacuum tube ports on the sides of those little Yam's carbs to attach the tubing to.
Hey Stan. No, those vacuum ports are on the intake manifold of four stroke motors, these two strokes go straight into the crankcase.
Hello,
I have exactly the same engine, 20D 2007 MY and i want to upgrade it to 25hp. From your knowledge, 20D has the same carbs as 25N?
Thank you
i notice that the cam roller has a flat spot on it as does mine on my 25hp . is that an indicator of wear or is that flat spot supposed to be there?
You mentioned balance/synchro is different for 2-stroke vs. 4-stroke engines. Why? Isn’t measurable vacuum the same variable for setting air flow and fuel mixture for both types engines, regardless of how the vacuum is regulated (via reeds or valves)? If not, What’s the difference in procedure for synchronizing carbs on 2-strokes?
great video quick question how do you synchronise throttle linkage on a 18hp tohatsu 2006
Never done one, but I imagine it would be similar to this outboard.
Do these motors have a vacuum port, to sync that way - like you did in a previous video? I'm assuming no, but wanted to check. In the process of purchasing a service manual.
No, vacuum ports are only on the intake manifold on four stroke motors.
Dangar Marine: Gotcha, thanks!
Hi how are u,,i have 25hp 2 stroke yamaha enduro with one carburettor ,it was running ok but when i cleaned the carb this problem start to happen (backfire and no power at all) hope u can help me