@@jorgehetnandez1696 You may find the needle is leaking in the carburetor? Clean up inside and double check :) either that or you’re not following the correct starting procedure? Could be a stiff metering diaphragm too, they can put more pressure on the lever. Have a look inside the carburetor is my advise :)
This is what I was looking for. You mention that the butterfly valve shaft cannot hang. For my Zama carburetor, it hangs both ways. Is that why I can't adjust the carburetor? Thanks again for the vids!!!
I've just watched up to the 13 minute mark and already learned more about these small carbs than I ever did in 40 years of messing with them. Great information well presented.
Absolutely one of the most informative two-stroke carburetor rebuilds I have seen on TH-cam yet and I have seen hundreds of videos on this topic, and have rebuilt hundreds of these carburetors myself only to learn something new in less than 20 minutes after 30 years of doing it! Best damn video around!
This guy is a treasure.. over the years have seen countless "how to" carb issue repairs, and have NEVER seen the level of clarity and explanation of the circuits and functions of these 2 cycle carbs that he does!! New sub here👍👍🙏🔥❤️
don't ever change how you give or do your videos , i been doing this work for over 30 years my own shop for 20 and every time I learn something new, or the proper or better way to explain it to my customers or employees so they understand the problem or understand how to fix the problem. so once again ,Thank You .
This is the best video I've seen to check 2 stroke carburetors. It has helped me greatly in diagnosing problems. Thanks for posting this! Eddie's Garage
Brilliant video explaining what took me 40 years to learn by hard lessons. Only bit you missed was the throttle control lever and post attached to the throttle valve. I've seen many carby's worn out and leaking fuel or sucking air due to continuous grit grinding them down.
Simply a brilliant tutorial, and I thank you much. Only complaint I can't get to sleep with all the valuable information you provide. All the best to you across the pond.
Thanks for clearly showing those tests. Never knew about the vacuum test on the main nozzle. Showing the punch out and re-seating of it was great. I'm often hesitant to take things apart too much (i.e. welch plugs) b/c I think I won't get them as well sealed as from the factory.
I was given a brush cutter motor and am building a remote control aircraft using it as the engine. It was not going and was destined for the scrap bin by the last owner. Thanks to the effort and time you spent making this video it is now running like a new one ! Thank you :)
Hey, I've watched dozens of videos on carb troubleshooting, and cleaning, and rebuilding. I've taken apart and worked on dozens of carbs myself, and this video was THE most in depth, and informative video on a 2-stroke carb, that I have ever seen. Cheers to you. Thanks so much for putting this together, and posting it.
@@VintageEngineRepairs I have no formal training, just what I’ve figured out on my own and what I’ve learned from watching videos. I’ve worked on these machines quite a bit over the past 30 years with mostly good results. After watching your video, it made me want to learn more about these little carburetors and it reignited my interest in working on these little machines. Where do you find kits that have the welch plug and brass check valve in them? Every kit I’ve ever seen only has gaskets, diaphragms, and the needle parts. Thanks again!
Im from the states and I enjoy your vids. I have a small engine shop and ive been working on small engines along time! I work on stihl mainly. But i do understand the need to clean and rebuild carbs vs new amazon or oem. Ive had so many come back after putting on an Amazon carb i just stopped ordering them and just buy oem. I go thru the process of cleaning each like you. 4 stroke carburetors are somewhat easy, but the stihl 2 stroke carbs are some of the worst ive worked on. Check valves and the high speed actuators on most are my problem. Fs90 carbs can be brought back to life and Some you just cant save. Carb spray in any carb but stihl seems to work fine. I remember the first stihl carb i cleaned with carb spray and after all that work it was worse than it originally was. I use a lot of little squeeze bottles too! Make my own solvents and lubes. Work better than most store bought. Its nice that there are some people who actually try to get something to work rather than be a part swapper, which i hate and hate 90% of these videos online. Anyone can change a part, but it takes a real mechanic to go into something and diagnose, clean, repair and rebuild what they are working on and it works correctly!
@VintageEngineRepairs hey your videos on when your cleaning and rebuilding carbs is quite calming. 😆 is there anyway you could do one on a rebuild and clean on a fs90 carb? If not I understand! Hey keep up the good work! I love your videos! Cheer!
Salutations! Please allow me to bend your ear a moment? I have come into a couple motorized skateboards recently and the engines are typical Chinese crap without any numbers or identifying marks anywhere. My question is, do u have a decent source for spare parts online? Rebuild kits? Diaphrams etc? I'm at my wits end with these cheap Chinese pos and just want these mfs to run. Any advice or sources for parts would be greatly appreciated. Thanks in advance!
BOY,YOU TURN OUT AMAZING AS YOU EXPLAINED IN DETAIL AND NAIL POLISH I DIDNT,T THINK COULD BE USED FOR SEALING .I WISH YOUTHE BEST OF LUCK BECAUZE YOU REALLY DESERVE IT
Hey thank you! Now with your lesson help there may well be hope and a cure for my 2stroke carb troubles. Over the years I've had so many issues with carbs on 2stroke engines that I have grown quite an aversion to them...
This is a genius in action. The most amazing quality, extraordinary skill and knowledge. I have the problem with my rather ancient Stihl SH55 leaf blower. I have replaced the bulb in the past but I believe that this could be a combination of problems with everything blocked from the petrol filter to the spark arrester that's apart from all the tiny tubes and openings so clearly explained in this remarkable video. I believe we may have a fellow lefthander here too!!. Thanks once again. MGN-Fire
I've watched about a dozen small engine/Walbro carb videos in the last week and this one is the best I've seen. Excellent content and no wasted words. Very useful stuff!
A clear and explanatory video with very detailed information. Definitely worth checking out. If I may give a tip: Speak a little slower and in particular, try to make the video recording seem a little calmer. So move back and forth less and more quietly with the objects shown in the video.
I agree with all the positive comments - great video - very clear camera work so you can see everything and very helpful commentary - now off to finally get my Stihl SH85 leaf blower working after 4 failed attempts!!
@@VintageEngineRepairs - well I have succeeded - it has a v cheap brand new OEM C1Q-S68G carb that I got from eBay for £13. I have stripped it down a couple of times before I watched your video, but not all the way. So took everything off and re-cleaned with carb cleaner and compressed air. The only think I spotted that might have been a problem was that the inlet control lever was hardly moving the inlet needle at all - much less than on another old carb I compared it to. So I bent the needle end of the lever (with the fork) up by about 0.5mm so that it was clearly moving up. Put it all back together and....nothing. Guess why? I forgot to reset the H & L needles. Once I did that it started easily and is running v well - just got to adjust the tickover as that's not quite right at the moment. So my top tip is - don't forget to reset the H & L needles after a carb teardown!! The only other problem I had was working out which way to put the metering diaphram back in - in addition to the screw holes it has 2 other holes at one end and I really couldn't see if it mattered which way to put ot back - so I guessed! Thanks again.
I thought that was an excellent video. Great job ! When I install a new screen that comes in the kit, I use the eraser on the end of a pencil , it is super close to the size of the hole and the eraser material will hold the screen from sliding around so you can precisely push it in the hole squarely. Once again Great job !
⚠⚠Thank You for an outstanding and infotmative video. Absolutely the best how to video that I've ever watched. Simple, to the point and done in a manner that is easy to follow. I will remember this information forever.
You Rock Tom. Can you believe I am still struggling with 2 strokes. The check valves are one. ? Crank seals are my new nemesis. You have a new handle on your brass hammer like I do.
Awesome video I'm out in the bush 40kms from the nearest settlement and my saws running like Forest Gump then it just stopped running , lucky I have reception on me phone and got to watch this ,I pulled the carb off and gave it a birthday and now it's clean as a whistle and running like Forrest again I have no nail polish or vacuum pump so I just sucked on the fuel tube no leaks ,salurbrious thank you for the pointers ,the fuel filter in the tank had a crack on where the fuel line pushed on so it was sucking up all sorts of crap that was under the mesh , all good now after sorting them coupla issues out cheers lots of handy tips
Very informative, this will be so much help to anyone with a 2 stroke . Concludes my theory that why are they still putting carbs on when a basic injection system would be far more reliable and simple to manufacture??? This goes for lawn mowers, stone saws , chainsaws etc . I’m aware that certain manufacturers have started using injection and from what I’ve seen they still can’t get it right , which suggests to me lack of talent in the design department or the dreaded ‘account says no ‘ . Saving pennies to inevitability ruin a feasible concept!! Thanks for the content, I will now attempt to rectify running issues with some of our engines 👍😇🇬🇧.
Better off getting a couple of $10 carbs off Amazon and keeping them on hand, but if you're in a bind and need it working NOW this is great knowledge. Thanks!
Great Video & excellent camera work, especially the close-ups. I did watch a video from the Walbro company and they mentioned that ethanol fuels can eat away the polish around Welsh plugs and check valves so I am not sure what the answer is here if they are leaking. I look forward to seeing other videos now that I have subscribed and hit the bell for notifications.😁
Thanks for sharing! Yes it can remove it over time. Welch plugs don’t really need sealant on them, the manuals don’t recommend anything now days because of alcohol. The aluminium seals very well :) I use it because we don’t have ethanol, but I’d happily use no sealer!
Wow! This is so helpful. Rich, genuine information covering what's been a "black box" for many of us. Thank you! Before: problems were poorly handled using the "shotgun" parts replacement technique. NOW: Test and understand root cause, target the actual problems, repair/replace bare minimum & maintain OEM integrity - resulting in faster, better, more reliable repairs. I've got old carbs that don't work - turns out I have been blowing out main nozzle check valves! Anybody know where to get replacement main nozzles?
If I can add one bit of advice: be gentle with the needle valves. Driving them down hard can damage them or the carburetor. Just screw them in gently. I learned this as a kid when running model airplane engines; I ruined a few needle valves until an older guy explained I was being too heavy handed. Great video! Cheers from Canada
Best teacher I've seen on the net. Thanks . I am old and forgetful, the gaskets and diefram go. Does all 2 stroke engines carburetor gaskets go the same? Thanks again Carl in Goodyear az.
Hey Carl, there is some variation especially on the older tillitson carbs from memory* however typically on the metering side the gasket goes down first then diaphragm. On the fuel pump the diaphragm goes down first. Warm regards, Tom.
Very interesting and very informative. I have a bit of knowledge re 4 stroke carbs on motorcycles and older cars 0f the 50's 60's and so on. but have never had to or been fortunate (?) enough to own and have to repair any 2 stroke equipment. Thanks for the video.
I feel I have just taken a Master Class in small engine two stroke carburetors ! As a student I would have asked one question , could the nylon 90degree elbow you removed be sealed by replacing it back with the nail polish around the brass fitting ? You sir have taught me a lot I didn’t know ! 👍
Thankyou so much for making this video I have watched many over the years but now have the complete version! So many little gremlins playing with carbs while we sleep but I'm confident I'll find them now cheers Dave
I'm slowly going through your video set, and like others this one raises the bar for all that's out there on TH-cam before. Brilliant lighting, excellent focus, and thoughtful dialogue. Can I ask you what camera you are using for close focus?
@@VintageEngineRepairs Wow. You're right, my phone is far better than my dying camcorder. I've been experimenting with other options, lately a GoPro, but even at 4K the near focus is poor. It would be so nice to use my old Canon lenses for posting TH-cam videos, but a close look at the R5C shows the cost is too high! We're at a glorious time, to find that simple phones can eclipse what the big boys want to charge thousands for. In the end, content trumps everything, and your channel is outstanding.
Qd electrical cleaner with the tube tip disolves corrosion pretty good and spray some in a bulb syringe then squirt it in to clean the check valves etc works good and some jewel's rouge on a q tip chucked in a Dremel tool or drill cleans and refinishes the seat area for the needle and seat, maybe that will help you out. All the best Sir.
Hey, I'm not sure I fully understand the part at 25:15. You pump air and you check if the lever is set? How? English is not my main language sorry 😀 Thanks for all the great content. I can tell you do it with love and passion. I know the walbro carbs pretty good, but you are on another level.
Hey :) yep you put pressure on the needle using the hand pump and the metering gauge should just touch the lever so that the needle only just cracks and lets a tiny amount of air through. That’s set correctly l.
@@VintageEngineRepairsthanks my man, I go it finally after reading your reply a few times and watching again. I thought how can you check the height if pumping air from this side will move the lever down eventually. But you push the lever down and check leakage. Pretty straightforward, but sometimes you just go in the wrong direction when "translating". Thanks a lot, best.
That’s ok :) yes the spring under the metering lever keeps the needle from letting air by. So using the gauge then allows you to set the height. Note that above a certain pressure - typically 10-15psi it will overcome that spring pressure and “pop off”. Pop off pressure has a small affect on how the engine will run :)
Thanks for the clarification Tom! Didn't get a notification or your latest reply but was thinking about asking your opinion these days. Yes, the pop off on walbro is a factory set number I think. Just watched your "jackhammer" save video. Great work as always. I helped a friend refurbishing a 2T chainsaw. It has a walbro wt. New fuel lines, filters, carb rebuild kit, clean carb, lever set to spec, gas leak test ok (thanks for the propane tip), idle excellent as long as you wish. You set up L H perfectly, it works for 5 minutes or 5 days perfectly then acts like it loses the tune completely. Bogs down usually when revving but keeps idle flawlessly usually. Suspected the L H jets are turning from vibration. Did a photo and hot glued them, it's not about that. I don't have the vacuum tester unfortunately but I guess it's the main valve on the carb or something like that? The carb gaskets and manifold are intact. Really strange honestly. It goes off, then you tune it perfectly in one minute, stays perfect for some time, starts to act funny. Usually bog down but revving fully eventually. I'm in Europe, an original walbro is hard to get, they cost a lot, aprox 90 euros, the shops have mostly China clones, but I'll try to find a used one or buy a clone for cheap directly from AliExpress. Sorry for the long message, I was really curious about your opinion and if you encountered anything similar. Many thanks in advance! Kind regards!
@@uadcroia și curāţā locul unde stā cuiul ponton sau ac cum îl numiți unii. Cuiul de obicei se blocheazā în locul lui,nu mereu și nu de tot de aia apar figurile ,ori relantiu mort ori turaţii sacadate
It's really satisfying to completely strip a carb then boil it out on the stovetop in dish soap, suspended on a wire then seeing what is in the bottom of the pan when you're done.
Thanks :) it should be soft and supple, should easily return to its position and be evenly symmetrical across the diaphragm in terms of shape and profile.
Great information and so very well shared. I just happen to have a Walbro wt717 from an Echo cs 501sx I have been sourcing a kit for today. Any content you may have done or might do in future on that minefield would be most welcome and helpful I am sure.
the way you replace the gasket and diaphragm on both side of the carburetor, ( one side the gasket and diaphragm and the opposite way on the other side)does it apply to all carburetors, I have Walbro 416 on my echo chain saw. Thanks for sharing
Does the needle clip onto the nipple on the diagram? You did not show that. I clipped my needle onto it for a Mac 10-10a chainsaw carburetor called a walbro SDC 37a. My saw runs good for a few minutes and then is impossible to start. I ordered a check valve on eBay. I have learned so much from this video but you missed the part I am struggling with. I live on long Island in NY. I am very impressed with your genteel spirit as you display Ann absolute supremacy in command of demonstrating the task at hand. I just don't come across this level of candor and professionalism in my day to day. I hope you take the time to respond and thank you for this wonderful video.
Thanks for your kind words. Yes many of the older saws have a clip on metering diaphragm to the metering lever. This carb, and most now days don’t clip on, they just contact under vacuum :) does it start up again once it’s cooled down? If your mac has points, it could be the condenser failing. If it’s not points it could be the coil. I’d suggest that you see if it has spark once it stops running. Hope this helps :)
Hi, it has a chip, so no points. It does start later. I thought about the coil. I'm going to inspect the check valve and see if I can get a coil. Thanks again!!!@@VintageEngineRepairs
Yeah, no coils for that on e-Bay right now. I'm still gonna go through the carb again while I wait for an ebay alert. I read an arbor site post with this saw that had the same issue and it was the check valve. Thanks again.@@VintageEngineRepairs
This is a great video-super helpful. However, I have done everything on here with meticulous care-but my carb is still not working! I am determined not to be beaten but I am all out of ideas. I know it is the carb as I bought a new one and the saw works perfectly, but I am determined to find out what is wrong with the old one. Are there any stones left to turn on solving starts-well-but-won’t-run carb issues?
Thanks for the kind words :) it could be 20 different things haha. Without hearing it run or having my hands on it, it’s quite difficult to diagnose unfortunately. You can take a video of you starting, running it and it cutting out and forward the link to tomscandian@hotmail.com 👍🏻
I have always found it easier to test the check valves in the carb float bowl by simply removing the needle valve, reassembly the carb, and put a vacuum on the fuel inlet. If the carb holds, the check valves are doing its job. (I should add that if the carb cannot hold vacuum, it does not necessarily mean the check valves are failing)
Worth noting that won’t work if it’s not a purge type carburetor as the low speed circuit won’t have a check valve. It’s best to test them directly where possible :)
Ah yes...this is why I go to the experts. I'm always trying to get a work around from checking these valves because sometimes is so hard to tell if the valve is leaking or if my test hose is slipping while testing....Great video by the way.
Yes I couldn’t agree more it is tricky! And sometimes they leak yet a small leak is actually acceptable, an allowance of a leak no faster than a loss of 7 psi in 4-5 seconds. Yeah it gets confusing lol
Great video thanks for posting it. Im trying to find out why my chainsaw will start, run for 2 seconds then die. Any suggestions aside from goin over the carb like in this video?
@@VintageEngineRepairs its brand new it starts everytime runs for a few seconda then dies i been trying carb adjustments but does same thing. I wonder if carb is faulty.
Hi there really helpful video that you posted right here. II would like to ask if the low and high needle will always have a small washer and gasket inside before it gets threaded. Thanks in advance
Thanks for the quick response, I’m in the middle of rebuilding a WJ-71, I removed the needles and sprayed carb clean on the holes where they go in, I was not paying attention if there’s a small washer and o-ring inside. Just wanted to make sure that I’m not missing anything. I’m hoping there’s none because when I thread the needles back they stop in the same position being close. Appreciate you time and help.
Hi great video very informative , i plan on cleaning my zama strimmer carb and replacing the innards with a kit . Would it be safe to use electrical cleaner spray to clean it ? Thank you
Great video, thank you! As I don't have a metering lever gauge, are you able to tell us the range of heights above or below level with carb body? My Stihl FS85 weedeater just floods like nothing else no matter what I do. I even resorted to putting a flame into the spark plug hole to burn off excess fuel in the chamber. I've found that if I pull the starter cord slowly with plug out and flame in there that for every stroke, a big dirty orange flame shoots out almost a foot long. Waaay too much fuel in there! I've had the carb apart 3 times now looking for a stuck or blocked jet or valve and am about to put a replacement carb on. I'd give it one more crack if you could help with this information. . I've currently got it set pretty much level and thought if I dropped it more the valve just wouldn't open at all.. Thanks heaps, Glen from New Zealand.
Outstanding tutorial. 👍 Mind if I ask the MityVac model number? I have an old plastic version that works vacuum only. Edit. Never mind. Just rewatched your other video. Answer in comments. 🍻
Nice video. I was a bit surprised that you use that uneven surfaced block to hammer stuff on, as it could damage the mating face where the diaphragms need to seal. That block has all sorts of lumps and bumps bashed into it. I know you need something solid to hammer on, but I guess even a piece of dense wood would suffice with a lesser risk of messing up the mating faces.
Thanks for sharing! I have never had an issue, it’s very light and gently tapping. Wood may work perfectly fine, but it will absorb the impact and you have to hit harder to get the same result :) thanks for watching and sharing very valid points!
@@VintageEngineRepairs Although you can't buy ethanol free in the UK anymore, I physically remove the ethanol so only use ethanol free. I might try testing it however with 5% ethanol pump gas before I remove the alcohol.
If this video helped you, please consider clicking on the THANKS button above to support my channel 🙌
Quick question, I have a 445 husqvarna x-torq that won't start but he sparkplug and exaust end floodsm??
@@jorgehetnandez1696 You may find the needle is leaking in the carburetor? Clean up inside and double check :) either that or you’re not following the correct starting procedure? Could be a stiff metering diaphragm too, they can put more pressure on the lever. Have a look inside the carburetor is my advise :)
This is what I was looking for. You mention that the butterfly valve shaft cannot hang. For my Zama carburetor, it hangs both ways. Is that why I can't adjust the carburetor? Thanks again for the vids!!!
Awesome video! I’ve learned so much more from this video!
Do you have a link to the carb repair kit?
I've just watched up to the 13 minute mark and already learned more about these small carbs than I ever did in 40 years of messing with them. Great information well presented.
Thanks mate :) much appreciated!
10,000 TIMES thank you! !
Well hats off to you my friend. You been working on small engines as long as I been alive. March 1983 I was born
Absolutely one of the most informative two-stroke carburetor rebuilds I have seen on TH-cam yet and I have seen hundreds of videos on this topic, and have rebuilt hundreds of these carburetors myself only to learn something new in less than 20 minutes after 30 years of doing it! Best damn video around!
Thank you Bob, your kind words are much appreciated!!!
Same here to both of you!
What was the new thing you learned?
This guy is a treasure.. over the years have seen countless "how to" carb issue repairs, and have NEVER seen the level of clarity and explanation of the circuits and functions of these 2 cycle carbs that he does!! New sub here👍👍🙏🔥❤️
Thank you! I really appreciate the kind words! :)
don't ever change how you give or do your videos , i been doing this work for over 30 years my own shop for 20 and every time I learn something new, or the proper or better way to explain it to my customers or employees so they understand the problem or understand how to fix the problem. so once again ,Thank You .
Thank you! I really appreciate it :)
This is the best video I have seen for troubleshooting and repairing this small engine carburetor.
Thank you!!
Here I am, 8 hours into an old craftsman chainsaw rebuild. Too stubborn to quit. The carb is the last piece of the puzzle. Thanks for the video!
You’re welcome!
I've learned more from this 30 minute video than I have from 10 other 40 minute videos. Excellent video! Thanks!
Glad you enjoyed it :)
"the best small engine carburetor video I have seen so far ever on TH-cam" ⭐⭐⭐⭐⭐ thanks 👍
Thank you Mark!
This is the best video I've seen to check 2 stroke carburetors. It has helped me greatly in diagnosing problems. Thanks for posting this!
Eddie's Garage
You’re welcome! :)
Brilliant video explaining what took me 40 years to learn by hard lessons. Only bit you missed was the throttle control lever and post attached to the throttle valve. I've seen many carby's worn out and leaking fuel or sucking air due to continuous grit grinding them down.
Absolutely spot on! They can wear / wallow out and cause an air leak. Thanks for the reminder :)
repaired engines all my life, bikes, mowers, hedge cutters, strimmers, etc
there is only one word that describes your tutorial,
BRILLIANT.
Thank you for such kind words!! It’s much appreciated :) glad you enjoyed it!
Simply a brilliant tutorial, and I thank you much. Only complaint I can't get to sleep with all the valuable information you provide. All the best to you across the pond.
Thank you Stewart!! Save them for the weekend haha :)
Thanks for clearly showing those tests. Never knew about the vacuum test on the main nozzle. Showing the punch out and re-seating of it was great. I'm often hesitant to take things apart too much (i.e. welch plugs) b/c I think I won't get them as well sealed as from the factory.
I'm always that there is a spring or something behind the Welch plug that I will lose when removing the Welch plug! 😢
Same here. That vacuum test makes great sense. I never thought to try it. Wish I had time and time again though. Thks
Best 2 stroke carb video I’ve seen. Thanks.
Thank you!
I was given a brush cutter motor and am building a remote control aircraft using it as the engine.
It was not going and was destined for the scrap bin by the last owner. Thanks to the effort and time you spent making this video it is now running like a new one !
Thank you :)
That’s awesome, I’m glad it helped :)
Hey, I've watched dozens of videos on carb troubleshooting, and cleaning, and rebuilding. I've taken apart and worked on dozens of carbs myself, and this video was THE most in depth, and informative video on a 2-stroke carb, that I have ever seen. Cheers to you. Thanks so much for putting this together, and posting it.
Awesome thank you! I’m glad you enjoyed it!
What a terrific video, I cannot imagine finding this amount of information any where else! Thank you so much for being so thorough!
You’re welcome! Thanks for such kind words 👍🏻
Definitely had to bookmark this video. Best video out there, hands down on two stroke carb testing. Thank You Sir.
You’re welcome!
Best vid I've seen for these carbs BUT i replace them for $20 and they work appreciate your time.
Thanks for watching :)
Hands down the best, most informative video on these carburetors in existence. Thank you!
That’s very high praise, thank you!
@@VintageEngineRepairs I have no formal training, just what I’ve figured out on my own and what I’ve learned from watching videos. I’ve worked on these machines quite a bit over the past 30 years with mostly good results. After watching your video, it made me want to learn more about these little carburetors and it reignited my interest in working on these little machines. Where do you find kits that have the welch plug and brass check valve in them? Every kit I’ve ever seen only has gaskets, diaphragms, and the needle parts. Thanks again!
Im from the states and I enjoy your vids. I have a small engine shop and ive been working on small engines along time! I work on stihl mainly. But i do understand the need to clean and rebuild carbs vs new amazon or oem. Ive had so many come back after putting on an Amazon carb i just stopped ordering them and just buy oem. I go thru the process of cleaning each like you. 4 stroke carburetors are somewhat easy, but the stihl 2 stroke carbs are some of the worst ive worked on. Check valves and the high speed actuators on most are my problem. Fs90 carbs can be brought back to life and Some you just cant save. Carb spray in any carb but stihl seems to work fine. I remember the first stihl carb i cleaned with carb spray and after all that work it was worse than it originally was. I use a lot of little squeeze bottles too! Make my own solvents and lubes. Work better than most store bought. Its nice that there are some people who actually try to get something to work rather than be a part swapper, which i hate and hate 90% of these videos online. Anyone can change a part, but it takes a real mechanic to go into something and diagnose, clean, repair and rebuild what they are working on and it works correctly!
Couldn’t agree more :) well said!
@VintageEngineRepairs hey your videos on when your cleaning and rebuilding carbs is quite calming. 😆 is there anyway you could do one on a rebuild and clean on a fs90 carb? If not I understand! Hey keep up the good work! I love your videos! Cheer!
Salutations! Please allow me to bend your ear a moment? I have come into a couple motorized skateboards recently and the engines are typical Chinese crap without any numbers or identifying marks anywhere. My question is, do u have a decent source for spare parts online? Rebuild kits? Diaphrams etc? I'm at my wits end with these cheap Chinese pos and just want these mfs to run. Any advice or sources for parts would be greatly appreciated. Thanks in advance!
beautifully demonstrated and explained
Thank you!
Great video my friend I have been doing these carbs for 60 years and one is never to old to learn new tricks!! Thank You! 👍Donny the Carb Guy👍
Thank you Donny! :)
BOY,YOU TURN OUT AMAZING AS YOU EXPLAINED IN DETAIL AND NAIL POLISH I DIDNT,T THINK COULD BE USED FOR SEALING .I WISH YOUTHE BEST OF LUCK BECAUZE YOU REALLY DESERVE IT
Thank you very much :)
Hey thank you! Now with your lesson help there may well be hope and a cure for my 2stroke carb troubles. Over the years I've had so many issues with carbs on 2stroke engines that I have grown quite an aversion to them...
Excellent :) best of luck!!
I can't stand the bloody things. Replacing them all with 4 strokes.
Probably the most informative video I've ever watched.Straight forward and to the point,I appreciate the info and thank you .
Thank you! I’m pleased you enjoyed it :)
This is a genius in action. The most amazing quality, extraordinary skill and knowledge. I have the problem with my rather ancient Stihl SH55 leaf blower. I have replaced the bulb in the past but I believe that this could be a combination of problems with everything blocked from the petrol filter to the spark arrester that's apart from all the tiny tubes and openings so clearly explained in this remarkable video. I believe we may have a fellow lefthander here too!!. Thanks once again.
MGN-Fire
I am a lefty yes hahah, glad you enjoyed the video!!
I've watched about a dozen small engine/Walbro carb videos in the last week and this one is the best I've seen. Excellent content and no wasted words. Very useful stuff!
Thank you! I’m pleased to hear it :)
Better than the Walbro tech guy videos.
Better than the Walbro tech guy videos.
A clear and explanatory video with very detailed information. Definitely worth checking out.
If I may give a tip: Speak a little slower and in particular, try to make the video recording seem a little calmer. So move back and forth less and more quietly with the objects shown in the video.
Thanks for watching and the feedback!
I agree with all the positive comments - great video - very clear camera work so you can see everything and very helpful commentary - now off to finally get my Stihl SH85 leaf blower working after 4 failed attempts!!
Wooo! Good luck :) keep me updated!
@@VintageEngineRepairs - well I have succeeded - it has a v cheap brand new OEM C1Q-S68G carb that I got from eBay for £13. I have stripped it down a couple of times before I watched your video, but not all the way. So took everything off and re-cleaned with carb cleaner and compressed air.
The only think I spotted that might have been a problem was that the inlet control lever was hardly moving the inlet needle at all - much less than on another old carb I compared it to. So I bent the needle end of the lever (with the fork) up by about 0.5mm so that it was clearly moving up. Put it all back together and....nothing. Guess why? I forgot to reset the H & L needles. Once I did that it started easily and is running v well - just got to adjust the tickover as that's not quite right at the moment.
So my top tip is - don't forget to reset the H & L needles after a carb teardown!!
The only other problem I had was working out which way to put the metering diaphram back in - in addition to the screw holes it has 2 other holes at one end and I really couldn't see if it mattered which way to put ot back - so I guessed!
Thanks again.
Awesome tutorial I have learnt so much in 10 minutes than in my 62 years of life. 😊😊😊
That’s wonderful to hear, thank you! Glad you enjoyed the video :)
FANTASTIC VIDEO!!! Hands down TH-cam's best video on this subject! 💯x💯
Thank you :) glad you enjoyed it!
I thought that was an excellent video. Great job ! When I install a new screen that comes in the kit, I use the eraser on the end of a pencil , it is super close to the size of the hole and the eraser material will hold the screen from sliding around so you can precisely push it in the hole squarely. Once again Great job !
Awesome tip thanks for sharing :) glad you enjoyed the video!
Best video on carb rebuilding I've ever seen, great job!
Thank you!
⚠⚠Thank You for an outstanding and infotmative video. Absolutely the best how to video that I've ever watched. Simple, to the point and done in a manner that is easy to follow. I will remember this information forever.
Glad you enjoyed it! Thanks for watching :)
This is the best technical but understandable explanation of these little carbs. Thank you as I learned things to and how to test!
Fantastic! You’re welcome!
Thank you, well described. Had difficulties with an ice auger that would not start, followed you tutorial and back up and running. Thank you
Glad it helped :)
You Rock Tom. Can you believe I am still struggling with 2 strokes. The check valves are one. ? Crank seals are my new nemesis. You have a new handle on your brass hammer like I do.
Thanks Bruce! Glad you enjoyed it :)
@@VintageEngineRepairs Wow I think i edited while you were talking. you are a social media Guru.
Awesome video I'm out in the bush 40kms from the nearest settlement and my saws running like Forest Gump then it just stopped running , lucky I have reception on me phone and got to watch this ,I pulled the carb off and gave it a birthday and now it's clean as a whistle and running like Forrest again I have no nail polish or vacuum pump so I just sucked on the fuel tube no leaks ,salurbrious thank you for the pointers ,the fuel filter in the tank had a crack on where the fuel line pushed on so it was sucking up all sorts of crap that was under the mesh , all good now after sorting them coupla issues out cheers lots of handy tips
That’s awesome :) thanks for taking the time to share your adventures haha
The standard by which all others shall be judged has been set. Thank You for your generosity.
Great, really great presentation. Thorough visuals and an unmatched understanding and explanation of this once Mystery Device.
Thank you for the kind words :) much appreciated!!
Very informative, this will be so much help to anyone with a 2 stroke .
Concludes my theory that why are they still putting carbs on when a basic injection system would be far more reliable and simple to manufacture??? This goes for lawn mowers, stone saws , chainsaws etc . I’m aware that certain manufacturers have started using injection and from what I’ve seen they still can’t get it right , which suggests to me lack of talent in the design department or the dreaded ‘account says no ‘ . Saving pennies to inevitability ruin a feasible concept!!
Thanks for the content, I will now attempt to rectify running issues with some of our engines
👍😇🇬🇧.
Thanks for the kind words :) glad you enjoyed it! I’ll take a carb over FI on small engines any day :)
Better off getting a couple of $10 carbs off Amazon and keeping them on hand, but if you're in a bind and need it working NOW this is great knowledge. Thanks!
Thanks for watching!
Great Video & excellent camera work, especially the close-ups. I did watch a video from the Walbro company and they mentioned that ethanol fuels can eat away the polish around Welsh plugs and check valves so I am not sure what the answer is here if they are leaking. I look forward to seeing other videos now that I have subscribed and hit the bell for notifications.😁
Thanks for sharing! Yes it can remove it over time. Welch plugs don’t really need sealant on them, the manuals don’t recommend anything now days because of alcohol. The aluminium seals very well :) I use it because we don’t have ethanol, but I’d happily use no sealer!
Wow! This is so helpful. Rich, genuine information covering what's been a "black box" for many of us. Thank you! Before: problems were poorly handled using the "shotgun" parts replacement technique. NOW: Test and understand root cause, target the actual problems, repair/replace bare minimum & maintain OEM integrity - resulting in faster, better, more reliable repairs. I've got old carbs that don't work - turns out I have been blowing out main nozzle check valves! Anybody know where to get replacement main nozzles?
Glad you enjoyed it! Yep, your local small engine repair shop can order nozzles.
If I can add one bit of advice: be gentle with the needle valves. Driving them down hard can damage them or the carburetor. Just screw them in gently. I learned this as a kid when running model airplane engines; I ruined a few needle valves until an older guy explained I was being too heavy handed. Great video! Cheers from Canada
Thanks mate :) yep, spot on! Gently seated is fully sealed!
great camera work. Most people who do this type of display screw up the focus. Very informative!
Thank you!
Amazing video, you demonstrated some very intriguing troubleshooting techniques. Thanks
Thank you :)
Check ball? Didn’t know about that. Sounds like my problem, going to check it. Thanks! Problem was kicking my butt for sure!
Yeah check valve or ball :) carbs come with either one! Best of luck!
Best teacher I've seen on the net. Thanks . I am old and forgetful, the gaskets and diefram go. Does all 2 stroke engines carburetor gaskets go the same? Thanks again Carl in Goodyear az.
Hey Carl, there is some variation especially on the older tillitson carbs from memory* however typically on the metering side the gasket goes down first then diaphragm. On the fuel pump the diaphragm goes down first. Warm regards, Tom.
Very interesting and very informative. I have a bit of knowledge re 4 stroke carbs on motorcycles and older cars 0f the 50's 60's and so on. but have never had to or been fortunate (?) enough to own and have to repair any 2 stroke equipment. Thanks for the video.
You’re welcome, I’m glad you enjoyed it :)
Best video I ever seen on these carbs. Well done👍
Thank you! :)
This is very helpful I enjoyed watching you and explain everything like you do
Thank you :)
Cool video, I learned stuff that will help me on my tiny engines. Thank you
Fantastic :)
I feel I have just taken a Master Class in small engine two stroke carburetors !
As a student I would have asked one question , could the nylon 90degree elbow you removed be sealed by replacing it back with the nail polish around the brass fitting ?
You sir have taught me a lot I didn’t know ! 👍
Glad you enjoyed it :) more than likely yes! It would be fine, I’d probably use CA Glue. Thanks for watching!
Thankyou so much for making this video I have watched many over the years but now have the complete version! So many little gremlins playing with carbs while we sleep but I'm confident I'll find them now cheers Dave
You’re most welcome Dave! Thanks for commenting and sharing your kind words!
hands down the best carb video and i seen many. great work,thanks
Thank you!!
Congratulations : you really understood howcit works a carburetor!
Thank you, you do too now :) I appreciate you!
I'm slowly going through your video set, and like others this one raises the bar for all that's out there on TH-cam before. Brilliant lighting, excellent focus, and thoughtful dialogue. Can I ask you what camera you are using for close focus?
Thank you! Just my mobile :)
@@VintageEngineRepairs Wow. You're right, my phone is far better than my dying camcorder. I've been experimenting with other options, lately a GoPro, but even at 4K the near focus is poor. It would be so nice to use my old Canon lenses for posting TH-cam videos, but a close look at the R5C shows the cost is too high! We're at a glorious time, to find that simple phones can eclipse what the big boys want to charge thousands for. In the end, content trumps everything, and your channel is outstanding.
@@spelunkerd thanks again for the kind words :) yes the iPhone gives good closes ups!
Qd electrical cleaner with the tube tip disolves corrosion pretty good and spray some in a bulb syringe then squirt it in to clean the check valves etc works good and some jewel's rouge on a q tip chucked in a Dremel tool or drill cleans and refinishes the seat area for the needle and seat, maybe that will help you out. All the best Sir.
Thanks for watching and sharing :)
Superb! I'll have another go on mine armed with this help. Many thanks!
You’re welcome!
Impressive and well done, absolutely great information
Thank you!
Great showing step by step ,how to clean a 2 stroke carburetor
Thanks :)
Hey, I'm not sure I fully understand the part at 25:15. You pump air and you check if the lever is set? How? English is not my main language sorry 😀 Thanks for all the great content. I can tell you do it with love and passion. I know the walbro carbs pretty good, but you are on another level.
Hey :) yep you put pressure on the needle using the hand pump and the metering gauge should just touch the lever so that the needle only just cracks and lets a tiny amount of air through. That’s set correctly l.
@@VintageEngineRepairsthanks my man, I go it finally after reading your reply a few times and watching again. I thought how can you check the height if pumping air from this side will move the lever down eventually. But you push the lever down and check leakage. Pretty straightforward, but sometimes you just go in the wrong direction when "translating". Thanks a lot, best.
That’s ok :) yes the spring under the metering lever keeps the needle from letting air by. So using the gauge then allows you to set the height. Note that above a certain pressure - typically 10-15psi it will overcome that spring pressure and “pop off”. Pop off pressure has a small affect on how the engine will run :)
Thanks for the clarification Tom! Didn't get a notification or your latest reply but was thinking about asking your opinion these days. Yes, the pop off on walbro is a factory set number I think. Just watched your "jackhammer" save video. Great work as always. I helped a friend refurbishing a 2T chainsaw. It has a walbro wt. New fuel lines, filters, carb rebuild kit, clean carb, lever set to spec, gas leak test ok (thanks for the propane tip), idle excellent as long as you wish. You set up L H perfectly, it works for 5 minutes or 5 days perfectly then acts like it loses the tune completely. Bogs down usually when revving but keeps idle flawlessly usually. Suspected the L H jets are turning from vibration. Did a photo and hot glued them, it's not about that. I don't have the vacuum tester unfortunately but I guess it's the main valve on the carb or something like that? The carb gaskets and manifold are intact. Really strange honestly. It goes off, then you tune it perfectly in one minute, stays perfect for some time, starts to act funny. Usually bog down but revving fully eventually. I'm in Europe, an original walbro is hard to get, they cost a lot, aprox 90 euros, the shops have mostly China clones, but I'll try to find a used one or buy a clone for cheap directly from AliExpress. Sorry for the long message, I was really curious about your opinion and if you encountered anything similar. Many thanks in advance! Kind regards!
@@uadcroia și curāţā locul unde stā cuiul ponton sau ac cum îl numiți unii. Cuiul de obicei se blocheazā în locul lui,nu mereu și nu de tot de aia apar figurile ,ori relantiu mort ori turaţii sacadate
It's really satisfying to completely strip a carb then boil it out on the stovetop in dish soap, suspended on a wire then seeing what is in the bottom of the pan when you're done.
Fantastic video Tom.👍👍👍
Thank you!
Awesome video, thank you .if the Needle is leaking. What would it do to the chainsaw when running?
Thanks :) running too rich! Flooding :)
How can I test and or tell if the main Diaphragm is good or bad? Luv the close up views and pin pointer views! Thx much.
Thanks :) it should be soft and supple, should easily return to its position and be evenly symmetrical across the diaphragm in terms of shape and profile.
@@VintageEngineRepairsthx much
Awesome video. I learned some new things. Love your videos
Thanks mate! Glad you enjoyed them :)
Excellent video. Very comprehensive.
Thank you!
Very nice detailed explanation..i learned a lot watching ur video..thanks❤
You’re welcome, thanks for watching!
What will be symptoms if that main check valve isn't holding pressure
If it’s not holding, you’ll have strange lean symptoms at idle.
Thank you! Looking forward checking out your other videos.
Thank you :)
Great information and so very well shared. I just happen to have a Walbro wt717 from an Echo cs 501sx I have been sourcing a kit for today. Any content you may have done or might do in future on that minefield would be most welcome and helpful I am sure.
Thanks for the kind words! I tend to make content on what comes through the workshop so possibly one day!! :)
Best and complete demonstration I’ve ever seen thank you
My pleasure thanks for watching!
this is the best cube carby rebuild video on TH-cam, so in depth. thanks
Pleasure :) thanks for watching!
the way you replace the gasket and diaphragm on both side of the carburetor, ( one side the gasket and diaphragm and the opposite way on the other side)does it apply to all carburetors, I have Walbro 416 on my echo chain saw. Thanks for sharing
Yes :)
Does the needle clip onto the nipple on the diagram? You did not show that. I clipped my needle onto it for a Mac 10-10a chainsaw carburetor called a walbro SDC 37a. My saw runs good for a few minutes and then is impossible to start. I ordered a check valve on eBay. I have learned so much from this video but you missed the part I am struggling with. I live on long Island in NY. I am very impressed with your genteel spirit as you display Ann absolute supremacy in command of demonstrating the task at hand. I just don't come across this level of candor and professionalism in my day to day. I hope you take the time to respond and thank you for this wonderful video.
I meant the fork in the needle bar that sits under the nipple in the diaphragm
Thanks for your kind words. Yes many of the older saws have a clip on metering diaphragm to the metering lever. This carb, and most now days don’t clip on, they just contact under vacuum :) does it start up again once it’s cooled down? If your mac has points, it could be the condenser failing. If it’s not points it could be the coil. I’d suggest that you see if it has spark once it stops running. Hope this helps :)
Hi, it has a chip, so no points. It does start later. I thought about the coil. I'm going to inspect the check valve and see if I can get a coil. Thanks again!!!@@VintageEngineRepairs
@@jkgkjgkijk it sounds like coil! Eliminate the plug first of course :) you’re welcome!
Yeah, no coils for that on e-Bay right now. I'm still gonna go through the carb again while I wait for an ebay alert. I read an arbor site post with this saw that had the same issue and it was the check valve. Thanks again.@@VintageEngineRepairs
Great video you got one on tuneing a echo302and putting a fuel inlet in
I don’t for that exact model, but I have tuning videos that you can copy - the process is all the same :)
your channel is a gem
Thank you :) I really appreciate it!
Superb presentation, very many thanks.
Thank you!
Awesome. Detailed and nicely explained. Thanks
Thank you!,
This is great!
Can you do another one but with a carby with a orimer bulb?
Sure :) here you go! Purge Bulb Won’t Fill Up With Fuel? Here's Why!
th-cam.com/video/fcJqZGZTFlU/w-d-xo.html
I would love to have an exact list of ever item used for testing!
Hey! I’d have to go through the video again and write it all down as it was years ago I made it!
can you show me where to get the pressure tester you are using? I really enjoyed this video. Thank you.
Hey :) absolutely, google mityvac 8500 👍
This is a great video-super helpful. However, I have done everything on here with meticulous care-but my carb is still not working! I am determined not to be beaten but I am all out of ideas. I know it is the carb as I bought a new one and the saw works perfectly, but I am determined to find out what is wrong with the old one. Are there any stones left to turn on solving starts-well-but-won’t-run carb issues?
Thanks for the kind words :) it could be 20 different things haha. Without hearing it run or having my hands on it, it’s quite difficult to diagnose unfortunately. You can take a video of you starting, running it and it cutting out and forward the link to tomscandian@hotmail.com 👍🏻
I have always found it easier to test the check valves in the carb float bowl by simply removing the needle valve, reassembly the carb, and put a vacuum on the fuel inlet. If the carb holds, the check valves are doing its job. (I should add that if the carb cannot hold vacuum, it does not necessarily mean the check valves are failing)
Worth noting that won’t work if it’s not a purge type carburetor as the low speed circuit won’t have a check valve. It’s best to test them directly where possible :)
Ah yes...this is why I go to the experts. I'm always trying to get a work around from checking these valves because sometimes is so hard to tell if the valve is leaking or if my test hose is slipping while testing....Great video by the way.
Yes I couldn’t agree more it is tricky! And sometimes they leak yet a small leak is actually acceptable, an allowance of a leak no faster than a loss of 7 psi in 4-5 seconds. Yeah it gets confusing lol
Thank you for the quality of troubleshooting.
You’re welcome!!
Thanx you are a awsome teacher!!just repair my carbu looking at you!
Awesome, you’re welcome :)
Great video thanks for posting it. Im trying to find out why my chainsaw will start, run for 2 seconds then die. Any suggestions aside from goin over the carb like in this video?
Hey, so many possibilities, did it run last time you used it? If so, open the L screw 1/4 of a turn.
@@VintageEngineRepairs its brand new it starts everytime runs for a few seconda then dies i been trying carb adjustments but does same thing. I wonder if carb is faulty.
@@garretgauthier685 in that case just take it back. It probably needs the L speed adjusted richer, or open the idle screw!
Hi there really helpful video that you posted right here. II would like to ask if the low and high needle will always have a small washer and gasket inside before it gets threaded. Thanks in advance
Thank you! Not always! It’s model specific :)
Thanks for the quick response, I’m in the middle of rebuilding a WJ-71, I removed the needles and sprayed carb clean on the holes where they go in, I was not paying attention if there’s a small washer and o-ring inside. Just wanted to make sure that I’m not missing anything. I’m hoping there’s none because when I thread the needles back they stop in the same position being close. Appreciate you time and help.
@@Jeremy-Joshua from what I can see, that model doesn’t have them, no. Good luck with the rebuild! :)
@@VintageEngineRepairs Thank you for your help! More power to you and your channel. 👍
Great video! Thanks for all the details.
God bless you!
You’re welcome, may God bless you too mate 👍
Nice presentation with dexterity and skills.
Thank you Janet!
Hi great video very informative , i plan on cleaning my zama strimmer carb and replacing the innards with a kit .
Would it be safe to use electrical cleaner spray to clean it ?
Thank you
Yep, that will be fine 👍
@@VintageEngineRepairs thank you , your channel is amazing
Great video, thank you! As I don't have a metering lever gauge, are you able to tell us the range of heights above or below level with carb body? My Stihl FS85 weedeater just floods like nothing else no matter what I do. I even resorted to putting a flame into the spark plug hole to burn off excess fuel in the chamber. I've found that if I pull the starter cord slowly with plug out and flame in there that for every stroke, a big dirty orange flame shoots out almost a foot long. Waaay too much fuel in there!
I've had the carb apart 3 times now looking for a stuck or blocked jet or valve and am about to put a replacement carb on. I'd give it one more crack if you could help with this information. . I've currently got it set pretty much level and thought if I dropped it more the valve just wouldn't open at all..
Thanks heaps, Glen from New Zealand.
Hey Glen! I will have to know what carb model and then I can tell you the height, sure! Don’t give up! You’ll get there :)
Outstanding tutorial. 👍
Mind if I ask the MityVac model number? I have an old plastic version that works vacuum only.
Edit. Never mind. Just rewatched your other video. Answer in comments. 🍻
Nice video. I was a bit surprised that you use that uneven surfaced block to hammer stuff on, as it could damage the mating face where the diaphragms need to seal. That block has all sorts of lumps and bumps bashed into it. I know you need something solid to hammer on, but I guess even a piece of dense wood would suffice with a lesser risk of messing up the mating faces.
Thanks for sharing! I have never had an issue, it’s very light and gently tapping. Wood may work perfectly fine, but it will absorb the impact and you have to hit harder to get the same result :) thanks for watching and sharing very valid points!
Amazing video to educate me, thank you very much.
You’re welcome :)
Great video Tom. Really helpful. Do you have any trouble from ethanol in petrol with the nail varnish??
Hey mate :) fortunately we don’t have ethanol out here, so I can’t say, but if you can test it and report back that would be awesome!
@@VintageEngineRepairs Although you can't buy ethanol free in the UK anymore, I physically remove the ethanol so only use ethanol free. I might try testing it however with 5% ethanol pump gas before I remove the alcohol.