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Four stroke carburettor synchronisation
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- Опубліковано 8 вер 2016
- 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 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.
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. :)
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. :)
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! :)
Great comparison with tuning a guitar. Always a pleasure watching your tutorials especially with a stubbie in the foreground. Thank you!
My pleasure!
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 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.
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 fixed my outboard by watching all your videos... Your the best!!
The best mechanic TEACHER on you tube.
Thanks Stuart!
Your demonstration videos are always the best for all outboard situations/conditions. Thx again!
Thanks mate.
I like your plane down to earth approach to everything
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. :)
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. :)
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!
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.
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. :)
Great video. I work on cars all the time and now I know this is well within my realm
Glad it helped
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.
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!
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.
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! :)
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.
Thank you, it really helps me understand what to do. Not difficult at all. Providing you have all the right test equipment and fittings.
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. :)
Very useful information. I haven't done this since I tuned a Honda 4 cylinder motorcycle... so good refresher
Thanks Ray.
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.
You are the most intelligent repair person i have seen..thanks man!!
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. :)
This worked like a charm. My BF30A purrs like a kitten now when trolling. Thank you very much.
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. :)
good video.done this procedure many times.i use a vacuum mate though.set the idle to 1000 rpm,and keep it at that rpm for the procedure.if you have balance tubes between the carbs,pinch them with plastic pinch off tool.takes some patience,but once done your engine will purr at idle.once al carbs are in sync,set idle speed back to specs.happy boating.
Those VacuumMates look really cool. You're not wrong about it getting the boat purring once it is done. :)
i`ve been doing marine repairs for 40+ years.i have to say that your videos are first class.you take the time to describe all procedures in depth.great analyzing and diagnostic skills.your explanations are clear and concise.i salut you sir,keep up the excellent work.best wishes from Canada.
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
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.
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.
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.
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.
Great video ! Super helpful ! Stu is my favorite boat tech on UA-cam! You are very clever and I like ur style !
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
That sir was the best explanation i have ever heard, thankyou very much
You're welcome, glad the video helped you.
Super informative and so very helpful. Getting ready to adjust my own and this gives me the needed knowledge.
Glad it was helpful!
You are very knowledgeable and a good teacher.
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?
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!
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!
Really appreciate the competence and quality in your videos awesome dude
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
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.
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!
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
just amazing , thanks very much,from Long Island NY.(Nino).
The most helpful & nice video in UA-cam!!! Thank you very very much!I slow down to 75% speed and saw this video 3 times. lol
Great job on explaining that, and how simple it is with the right tools.
Thanks Bryan!
Thanks again for your helpful Videos. Keep up the great work... From Germany
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.
I put my boat together from your vid’s I’m a expert now thank you
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.
This video helped me get my 99 75hp Yamaha dialed in.
love your videos! going through an old Johnson qd-14 and cd-11 your videos have helped tremendously.
Glad to help!
Very good and impressive video. I never knew there was so much involved in tuning the carburetors. Thanks Stu
I absolutely love watching all of your videos thank you for sharing your knowledge
The 86 people that gave you a thumbs down must just not like your accent. Thanks stu, very helpful
Good video. I learned quite a bit and ready to tackle tuning up my outboard.
Thanks mate, good luck with the tune up. :)
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 ua-cam.com/video/NnotQmnKxKM/v-deo.html
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!
This was a great video how I explained each carburetor may be adjusted a little different.
I know this is an old post but thanks. Really Really helpful.
Glad it was helpful!
I tell everyone to watch your videos you explain what your doing so well
Thanks Daniel!
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!
The most informative video I've seen on this topic. Thanks for that
You're welcome, glad you liked it. :)
You have an amazing channel.
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.
Thanks a lot sir... we love your presentations and great videos ... carry on .. god bless you
Brilliant clear explanation. Thanks. VERY helpful.
You're welcome!
Great video, very clear and easy to follow along. Thanks a million!
Que capo que sos! gracias todos los videos que subís me están ayudando un montón! Saludos desde Argentina
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!
Very informative, thanks for making these boat motor videos.
My adjustments get lean as I turn out. I had a misfire on one cylinder at about 5 half turns out. So I leaned it out to around 7 half turns out and it’s much better.
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!
I have buy de exact same engine, little iddle problems. Thankss! Voor the video👌🏻👌🏻
Tube length would matter in theory because air is elastic so a bit more stretch would lessen pressure at the gauge by probably an insignificant amount for your purposes, but not sure what the percentage would be. Great video as usual Stu!
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! :)
Great explanation thank you!
Awesome thanks Stu. Ive got similar on my BF45. Cutting out at 1200rpm as trying to accelerate. Picking running too lean/and or cold, have ordered replacement thermostat to replace to missing current one.
Just subscribed. Easy to follow common sense tutorials on marine maintenance. Happy Boatie.
The ol’ “Fender noise”.. no dog around to blame it on hey ;) Grea video mate cheers!
Very well presented even for the simplest of us
Thank you, you are very thorough
Absolutely fantastic video thumbs up
You r top class mechanic,great videos.
Thanks Ronald, glad you like the vids. :)
Amazing information. Thank you so much
Never done learning! Thanks
Happy to help!