2 Stroke Carburetor - In depth Fault Finding, Testing, Service & Repair

[@VintageEngineRepairs]

If this video helped you, please consider clicking on the THANKS button above to support my channel 🙌

[@jorgehetnandez1696]

Quick question, I have a 445 husqvarna x-torq that won't start but he sparkplug and exaust end floodsm??

[@VintageEngineRepairs]

@@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 :)

[@7Toki777]

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!!!

[@ianbatterson2331]

Awesome video! I’ve learned so much more from this video!

[@fidencioflores2680]

Do you have a link to the carb repair kit?

[@ehguy3628]

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.

[@VintageEngineRepairs]

Thanks mate :) much appreciated!

[@obbiebeal3060]

10,000 TIMES thank you! !

[@macknumber9]

Well hats off to you my friend. You been working on small engines as long as I been alive. March 1983 I was born

[@bobgregory8787]

Absolutely one of the most informative two-stroke carburetor rebuilds I have seen on KZbin 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!

[@VintageEngineRepairs]

Thank you Bob, your kind words are much appreciated!!!

[@andrew_koala2974]

There is a wealth of knowledge out there. The majority of people do not take the time to listen and learn from others. Instead many chose ignorance and are proud of it. Some f what I learned is from experience and making errors everything else I learned from those who know more than I do. I don't like sports that much - never did - I much like knowledge and learning

[@garychandler4296]

Same here to both of you!

[@Ant_Knee_Smith]

What was the new thing you learned?

[@gregorysmallenginelawnequi7471]

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 .

[@VintageEngineRepairs]

Thank you! I really appreciate it :)

[@davehamson1972]

This is the best video I have seen for troubleshooting and repairing this small engine carburetor.

[@VintageEngineRepairs]

Thank you!!

[@kerryrump6028]

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

[@VintageEngineRepairs]

You’re welcome! :)

[@geradkavanagh8240]

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.

[@VintageEngineRepairs]

Absolutely spot on! They can wear / wallow out and cause an air leak. Thanks for the reminder :)

[@beachthor1]

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!

[@VintageEngineRepairs]

You’re welcome!

[@markcdeyoung3118]

"the best small engine carburetor video I have seen so far ever on KZbin" ⭐⭐⭐⭐⭐ thanks 👍

[@VintageEngineRepairs]

Thank you Mark!

[@stewartbruce8902]

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.

[@VintageEngineRepairs]

Thank you Stewart!! Save them for the weekend haha :)

[@haroldshipston2880]

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 :)

[@VintageEngineRepairs]

That’s awesome, I’m glad it helped :)

[@chris72972]

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]

Awesome thank you! I’m glad you enjoyed it!

[@clive1860]

repaired engines all my life, bikes, mowers, hedge cutters, strimmers, etc there is only one word that describes your tutorial, BRILLIANT.

[@VintageEngineRepairs]

Thank you for such kind words!! It’s much appreciated :) glad you enjoyed it!

[@patrickwhalen4781]

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.

[@jhawkins4412]

I'm always that there is a spring or something behind the Welch plug that I will lose when removing the Welch plug! 😢

[@craftsmanbyheart]

Same here. That vacuum test makes great sense. I never thought to try it. Wish I had time and time again though. Thks

[@carlbowman8733]

Definitely had to bookmark this video. Best video out there, hands down on two stroke carb testing. Thank You Sir.

[@VintageEngineRepairs]

You’re welcome!

[@gilpicard6024]

Best vid I've seen for these carbs BUT i replace them for $20 and they work appreciate your time.

[@VintageEngineRepairs]

Thanks for watching :)

[@MegaBill502]

Hands down the best, most informative video on these carburetors in existence. Thank you!

[@VintageEngineRepairs]

That’s very high praise, thank you!

[@MegaBill502]

@@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!

[@jlcastille9017]

I've learned more from this 30 minute video than I have from 10 other 40 minute videos. Excellent video! Thanks!

[@VintageEngineRepairs]

Glad you enjoyed it :)

[@donkuwik3390]

The standard by which all others shall be judged has been set. Thank You for your generosity.

[@donaldlaplante4818]

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👍

[@VintageEngineRepairs]

Thank you Donny! :)

[@chrisbrimer2641]

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]

Couldn’t agree more :) well said!

[@chrisbrimer2641]

@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!

[@oliverklozhoff]

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!

[@craftsmanbyheart]

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...

[@VintageEngineRepairs]

Excellent :) best of luck!!

[@no2thenwo737]

I can't stand the bloody things. Replacing them all with 4 strokes.

[@DtKnize]

Best video on carb rebuilding I've ever seen, great job!

[@VintageEngineRepairs]

Thank you!

[@dinnicusor5312]

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

[@VintageEngineRepairs]

Thank you very much :)

[@ChrisDart-y4w]

Probably the most informative video I've ever watched.Straight forward and to the point,I appreciate the info and thank you .

[@VintageEngineRepairs]

Thank you! I’m pleased you enjoyed it :)

[@gfoxer]

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!

[@VintageEngineRepairs]

Thank you! I’m pleased to hear it :)

[@markbeatty5820]

Better than the Walbro tech guy videos.

[@markbeatty5820]

Better than the Walbro tech guy videos.

[@rogerdoucet2372]

Thank you, well described. Had difficulties with an ice auger that would not start, followed you tutorial and back up and running. Thank you

[@VintageEngineRepairs]

Glad it helped :)

[@darrenadams1555]

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

[@VintageEngineRepairs]

That’s awesome :) thanks for taking the time to share your adventures haha

[@michaelspencer301]

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 !

[@VintageEngineRepairs]

Awesome tip thanks for sharing :) glad you enjoyed the video!

[@davidbennett1316]

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]

Wooo! Good luck :) keep me updated!

[@davidbennett1316]

@@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.

[@benkanobe7500]

This is the best technical but understandable explanation of these little carbs. Thank you as I learned things to and how to test!

[@VintageEngineRepairs]

Fantastic! You’re welcome!

[@smartt]

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!

[@VintageEngineRepairs]

Thanks for watching!

[@anthonytrodriguez7166]

Great showing step by step ,how to clean a 2 stroke carburetor

[@VintageEngineRepairs]

Thanks :)

[@independenttntn3276]

FANTASTIC VIDEO!!! Hands down KZbin's best video on this subject! 💯x💯

[@VintageEngineRepairs]

Thank you :) glad you enjoyed it!

[@ehguy3628]

Great, really great presentation. Thorough visuals and an unmatched understanding and explanation of this once Mystery Device.

[@VintageEngineRepairs]

Thank you for the kind words :) much appreciated!!

[@kitionemok1960]

Awesome tutorial I have learnt so much in 10 minutes than in my 62 years of life. 😊😊😊

[@VintageEngineRepairs]

That’s wonderful to hear, thank you! Glad you enjoyed the video :)

[@BrucesShop]

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.

[@VintageEngineRepairs]

Thanks Bruce! Glad you enjoyed it :)

[@BrucesShop]

@@VintageEngineRepairs Wow I think i edited while you were talking. you are a social media Guru.

[@scoffroadventuresrl.974]

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.

[@VintageEngineRepairs]

Thanks for watching and the feedback!

[@divemastr17]

great camera work. Most people who do this type of display screw up the focus. Very informative!

[@VintageEngineRepairs]

Thank you!

[@newagetemplar6100]

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 👍😇🇬🇧.

[@VintageEngineRepairs]

Thanks for the kind words :) glad you enjoyed it! I’ll take a carb over FI on small engines any day :)

[@600miles]

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.

[@mrbibstoo]

⚠⚠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.

[@VintageEngineRepairs]

Glad you enjoyed it! Thanks for watching :)

[@zechariahbranch3555]

Amazing video, you demonstrated some very intriguing troubleshooting techniques. Thanks

[@VintageEngineRepairs]

Thank you :)

[@billnahorn3939]

Best and complete demonstration I’ve ever seen thank you

[@VintageEngineRepairs]

My pleasure thanks for watching!

[@breikowski]

Check ball? Didn’t know about that. Sounds like my problem, going to check it. Thanks! Problem was kicking my butt for sure!

[@VintageEngineRepairs]

Yeah check valve or ball :) carbs come with either one! Best of luck!

[@TheHansoost]

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.

[@VintageEngineRepairs]

You’re welcome, I’m glad you enjoyed it :)

[@TeroristulPasnic]

Congratulations : you really understood howcit works a carburetor!

[@VintageEngineRepairs]

Thank you, you do too now :) I appreciate you!

[@joebelson7122]

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?

[@VintageEngineRepairs]

Glad you enjoyed it! Yep, your local small engine repair shop can order nozzles.

[@paulmaxwell8851]

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

[@VintageEngineRepairs]

Thanks mate :) yep, spot on! Gently seated is fully sealed!

[@modifyman6977]

Okay...so this has got to be the most thorough check list for 2 stroke carbs out there...here...anywhere? ...ehh, anywhere may be a smidgen exaggerated. Definitely the best I have come across...which was actually through Roku...but I had to step over to the PC to comment. The only thing you may had missed, the primer bulb? Which holes/channels it is suppose to affect. I didn't realize the idle had 3 jets. ...Oh, look over there... "All Episodes - 2 Stroke Carburetor Learning" Did I make someone look? Any ways, I also wanted to capture this for later reference and say this info will surely cause me to spend more time being thorough...but less time over all by not having to disassemble what I had just assembled for the third time.

[@VintageEngineRepairs]

Glad you enjoyed it! I have other videos on carburetors that have a purge bulb :) hope you enjoy them as much!

[@Patirish-bc1qb]

Best video I ever seen on these carbs. Well done👍

[@VintageEngineRepairs]

Thank you! :)

[@terrydouglas2777]

Cool video, I learned stuff that will help me on my tiny engines. Thank you

[@VintageEngineRepairs]

Fantastic :)

[@williamgraham6154]

This is very helpful I enjoyed watching you and explain everything like you do

[@VintageEngineRepairs]

Thank you :)

[@neilphilip2320]

Superb! I'll have another go on mine armed with this help. Many thanks!

[@VintageEngineRepairs]

You’re welcome!

[@deekreece-lh9pj]

hands down the best carb video and i seen many. great work,thanks

[@VintageEngineRepairs]

Thank you!!

[@outtatime4512]

I will simply agree with all the accolades given. I am fighting to understand the carb circuits and operation on a zama but now have a much better knowledge of what to examine.

[@VintageEngineRepairs]

Wonderful, I’m pleased to hear it! :)

[@outtatime4512]

@@VintageEngineRepairs apparently it's got a bad check valve. I can't even get it to deliver any fuel. I'm gonna tell the customer to go buy another.

[@Dicko99]

Awesome. Detailed and nicely explained. Thanks

[@VintageEngineRepairs]

Thank you!,

[@davidash989]

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

[@VintageEngineRepairs]

You’re most welcome Dave! Thanks for commenting and sharing your kind words!

[@eidodoos]

your channel is a gem

[@VintageEngineRepairs]

Thank you :) I really appreciate it!

[@janetcohen9190]

Nice presentation with dexterity and skills.

[@VintageEngineRepairs]

Thank you Janet!

[@hkgainer1]

Thank you! Looking forward checking out your other videos.

[@VintageEngineRepairs]

Thank you :)

[@randyleaf1026]

Impressive and well done, absolutely great information

[@VintageEngineRepairs]

Thank you!

[@ELDIABLO444]

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.

[@VintageEngineRepairs]

Thanks for watching and sharing :)

[@warddc]

Excellent video. Very comprehensive.

[@VintageEngineRepairs]

Thank you!

[@wallyschloeffel1678]

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.😁

[@VintageEngineRepairs]

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!

[@PumpkinheadsPlayhouse]

Thank you for the quality of troubleshooting.

[@VintageEngineRepairs]

You’re welcome!!

[@carlcannedy2669]

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.

[@VintageEngineRepairs]

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.

[@Robert-uh6bx]

Awesome video. I learned some new things. Love your videos

[@VintageEngineRepairs]

Thanks mate! Glad you enjoyed them :)

[@hotchihuahua1546]

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 ! 👍

[@VintageEngineRepairs]

Glad you enjoyed it :) more than likely yes! It would be fine, I’d probably use CA Glue. Thanks for watching!

[@Ralf1erudd]

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.

[@VintageEngineRepairs]

Thanks for the kind words! I tend to make content on what comes through the workshop so possibly one day!! :)

[@nickush7512]

Superb presentation, very many thanks.

[@VintageEngineRepairs]

Thank you!

[@Ckktopa]

this is the best cube carby rebuild video on KZbin, so in depth. thanks

[@VintageEngineRepairs]

Pleasure :) thanks for watching!

[@ysrcutoo1]

Very nice detailed explanation..i learned a lot watching ur video..thanks❤

[@VintageEngineRepairs]

You’re welcome, thanks for watching!

[@alfredprestwick7774]

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.

[@VintageEngineRepairs]

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!

[@johnnygagnon4968]

Thanx you are a awsome teacher!!just repair my carbu looking at you!

[@VintageEngineRepairs]

Awesome, you’re welcome :)

[@michaelboyle1983]

Great video! Thanks for all the details. God bless you!

[@VintageEngineRepairs]

You’re welcome, may God bless you too mate 👍

[@jimmypickett9912]

I would love to have an exact list of ever item used for testing!

[@VintageEngineRepairs]

Hey! I’d have to go through the video again and write it all down as it was years ago I made it!

[@jondor654]

Brilliant demo

[@VintageEngineRepairs]

Thank you!

[@tunnelrabbit2625]

Extremely helpful. Thank you.

[@VintageEngineRepairs]

You’re welcome 👍

[@andrescheuer4400]

I have indeed taken those butterfly shafts out and made biger ones with no play but that was because i had no other option at the time it used to give my local dealer fits he thaught i was starting some kind of revolution

[@VintageEngineRepairs]

Haha, I find the more creative I get the more problems I introduce, but glad to hear it worked for you. :) now I have a lathe maybe I’ll try it!!

[@adriankennedy4099]

Amazing video to educate me, thank you very much.

[@VintageEngineRepairs]

You’re welcome :)

[@dousuke1979]

very very informative! good job making this

[@VintageEngineRepairs]

Thank you :)

[@brianperkins6121]

some carbs have a one way check valve on "both" the low speed and high speed side , zama I beleave does this , that tiny ltittle flapper valve inside them has a nasty tendacy to swell up (or better yet turn into a wad of goo) making then leak or become totaly pluged in both directions.. some are so difficult to replace that replacing the carb is the only way to repair the issue depends upon the carb design as to how serviceable they are .. if the check valves dont work correctly as said a simple rebuild kit will not fix the issue iin this case. until the bad check valves are addresed. and they are often overlooked .

[@slightlypermafried]

This has been my experience on a homelite super 2 with a zama carb. It was leaking air into the purge line that goes to the primer bulb. Main check valve was also finnicky at first but resolved itself. The kit came with a welch plug so I tried inspecting the idle check valve. Looked fine and I tried punching out a new plastic disc/valve but it only got worse. I put the old one back in, still some bubbles in the purge line and also soapy water test that indicated it's leaking from idle check valve. But it's better now and purges most of the air out if I release the bulb slowly. I'm curious to know if they're that necessary as some don't have it. Figured if mine worked partially, it would still run as it's only the low speed Also to OP, great video, wish I saw this before I started, I butchered my check valve trying to pull it out the wrong direction lol. Was curious if my check valve might leak in the same manor as I left some marks changing it out. Might have to go back and use some nail polish to be sure. Very helpful, informative and to the point

[@donmayberryjrsOPE]

You're so right! It took me many many years of hard knocks to realize the importance of those damn check valves! I'd blow through those carbs with the air gun at 110 psi, rebuild it with a kit only to have to replace the carb not knowing why! Why didn't they tell us about those valves 40 years ago!?!

[@Mike75575]

Yes indeed. These are a curse.

[@brianperkins6121]

One of the things one also has to be mindful of is solvents in strong carb cleaner will attack the material inside the valve dissolving it it into a wad of goo, so be careful what you use. there are check valves in the primer housing as well as the carb body itself. fuel will do this in time as well. store equipment with the carb purged totally dry is one suggestion. I suspect additives used in some fuels are a big part of the blame .

[@donmayberryjrsOPE]

@@brianperkins6121 agreed! Which carb cleaner don't you use?

[@moisty254]

This is great! Can you do another one but with a carby with a orimer bulb?

[@VintageEngineRepairs]

Sure :) here you go! Purge Bulb Won’t Fill Up With Fuel? Here's Why! kzbin.info/www/bejne/nJStoo19j7l5orc

[@williamemerson1799]

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. 🍻

[@uadcro]

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.

[@VintageEngineRepairs]

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.

[@uadcro]

​@@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.

[@VintageEngineRepairs]

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 :)

[@uadcro]

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!

[@marianm9586]

​@@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

[@Angry-Lynx]

What will be symptoms if that main check valve isn't holding pressure

[@VintageEngineRepairs]

If it’s not holding, you’ll have strange lean symptoms at idle.

[@aarondrumgo7785]

Excellent presentation. I may actually try to rebuild a few. I've been tossing them to side and buying another; lil carbs are getting pricey these days. Thanks for this information

[@VintageEngineRepairs]

Pleasure! Glad it helps :)

[@davepearce4300]

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?

[@VintageEngineRepairs]

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 [e-mail] 👍🏻

[@atcmadness4351]

I really appreciated this video. You could use some powder coating tapered silicone plugs instead of that Playdoh material you were plugging holes with; some of them taper to very small sizes...

[@VintageEngineRepairs]

Hey mate, I do have them but they’re not fine enough for the small drillings. Glad you enjoyed the content!

[@VintageEngineRepairs]

Great tip!!

[@toddrhine7648]

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.

[@VintageEngineRepairs]

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.

[@toddrhine7648]

​@@VintageEngineRepairsthx much

[@Jjay-tw1yy]

glad i found your channel great info 👍🏼

[@VintageEngineRepairs]

Thank you :)

[@7Toki777]

That was a great vid! Thank you so much!

[@VintageEngineRepairs]

You’re very welcome!

[@jefflockwood]

Great video nice clear picture and sound..

[@VintageEngineRepairs]

Thanks! Glad you enjoyed it

[@MosoteX]

A Master!! Thank you a MILLION!!

[@VintageEngineRepairs]

You’re welcome!

[@jsollien127]

What a great video. I've got a Hitachi Cs33eb (chainsaw) and the exploded view shows membrane then gasket (opposite of your carb). However, the carb was assembled the other way around (like your carb). Any idea if Hitachi/Tanaka/Metabo carbs are different? Thanks!

[@VintageEngineRepairs]

Thanks! Hmm I haven’t ever seen it backwards, but if the manual says to do so, stick with that :)

[@phbrinsden]

When I used small 2 stroke engine equipment I never found it worthwhile repairing these little carbs. They are a few dollars on Amazon. All my gas/petrol driven garden equipment is now gone. It has been replaced with DEWALT 20 or 60 volt equipment. My workshop already had been converted from corded to 20/60 volt DEWALT stuff so the batteries and chargers were already in hand. All I needed were the bare tools. Nice and quiet, no fuel storage, always ready and always works.

[@VintageEngineRepairs]

I find it rewarding and much quicker and cheaper to repair oem rather than replace with Chinese am. Takes weeks to arrive here in Australia and they’re always $40-$50 each or more.

[@leontaylor3572]

can you show me where to get the pressure tester you are using? I really enjoyed this video. Thank you.

[@VintageEngineRepairs]

Hey :) absolutely, google mityvac 8500 👍

[@spelunkerd]

I'm slowly going through your video set, and like others this one raises the bar for all that's out there on KZbin before. Brilliant lighting, excellent focus, and thoughtful dialogue. Can I ask you what camera you are using for close focus?

[@VintageEngineRepairs]

Thank you! Just my mobile :)

[@spelunkerd]

@@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 KZbin 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.

[@VintageEngineRepairs]

@@spelunkerd thanks again for the kind words :) yes the iPhone gives good closes ups!

[@davidruiz5383]

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

[@VintageEngineRepairs]

Yes :)