Buckin's 266 stopped running good again!! I FOUND THE PROBLEM!!

[@CosmosMBTS]

Same problem rebuilding a Stihl FS85R with new piston, rings, pot, base gasket delete, muffler mod and new aftermarket carby. The new aftermarket carby was stuffed out of the box, even pulled it apart re-kitted it and still the same. Finally pulled a Stihl carby off a known working FS85 and BAM!!! it ran and tuned.

[@passagecreekbees348]

I have rebuilt all kinds of carbs in my life time fr 70 years and they still get me every now an then.Good job on that one.

[@kennyking6325]

Friends, We have just watched a true professional. Lets learn our lesson the easy way today. Thank you, Kenny

[@jordanmarg1791]

"Friends dont let friends run aftermarket carbs" I would buy that T-shirt. LOL

[@DaveyBlue32]

This channel needs this shirt designed! I’ll definitely buy a couple of those for a couple TreeFiddy Boy’s!!!

[@mlyniecm]

My 255 started doing this last weekend cutting fire wood and after passing a p/v test I was very stumped. Great video

[@InyoTim]

Thanks for the video Tinman. A frankenvarna I just finished putting together out of spare parts was showing the symptoms of what I thought might be an air leak. After watching this video , I pulled the new aftermarket carb and reinstalled the original Walbro with a new kit. Saw runs fine now. 👍

[@shapeshifter7753]

Tinman! Thanks for your persistence during this build and your willingness to share👍now... Can we see it in the wood already😁

[@SupermanJH68]

I went through 3 carbs rebuilding a Husky 460 this winter. Finally broke down and got an original Husqvarna carb. Thank you for this video and the lesson review. Great work, and excellent support for problem saws.

[@johnarnettsways.8758]

I love it. Finally a man that can trouble shoot instead of just throwing parts at it. We have enough parts guys. Great job troubleshooting sr. Have a great day. God bless.

[@jasonpeters4867]

Great video Tinman, love the throttle response of that saw it's awesome, can't wait to see it cuttin wood.

[@rchighfield1]

Appreciate the first hand experience shared, got a Husky backpack blower constantly needing adjustments, AM carb at the start of spring, gonna rebuild original before doing anything else. You can’t argue with results! Or at least I don’t. 😂

[@codymcfalls21]

this came just in time for me. I should have the rest of the parts to complete my 266xp today and these have help me prepare for anything.

[@shaner67]

Yeppers Tinmaaaaan, friends don't let friends run after market carbs.. You and I have discussed this topic over email before. Stick with a good OEM Tillison in this case. Nice build and so happy to hear it rumble along.. All the best to you always, Slant'e

[@toddkummet934]

This is a very good Video to see. Learn something today. NO after market carbs will ever touch my saws.

[@Aldo2m0r04]

I had a similar problem with a Castor C40, but in my case it wouldn't start at all. After trying everything I could think of, I thought the carb was bad. So, from 3 Tillotson HU's I made one. Since then, i did not have any problems.

[@topnotchtreeservice5542]

I jus assembled a ms261 and struggled for three days back and forth. Replaced crank seals impulse as well as intake boot. Was ready to pull my hair out. Then I got to looking at the new carb that had been put on previous to me getting the saw to work on. It was a Chinese brand carb. Not gonna give the brand. (Aftermarket). I then decided to tear down and rebuild the oem carb. Put it together saw now tunes and runs perfect. I no longer will run the aftermarket carbs and coils or intake boots

[@davidbulich1254]

I agree, I learned the hard way aftermarket junk ain't worth wasting my time

[@stevetheriault4164]

ZING BP BBP BP BP BP BP I LOVE IT ,KEEP UP THE GREAT SOUND EFFECTS TINMAN ,GLAD YOU GOT IT UNDER CONTROL BUDDY,MY FRIENDS 028 STIHL CAUSED ME SOME GREIF LAST YEAR ,TOOK ME 3 DAYS TO GET HER FIGURED OUT ,,GREAT JOB TAKE HER EASY TINMAN BE SAFE BUDDY

[@harry8506]

Many years ago I bought a Mcculloch PM480, it was hard to star from day 1, I sent it back under warranty and it came back exactly the same. I checked everything, out of desperation I removed the muffler to see if there was a restriction, it was clean. I started it with no muffler first pull, put the muffler back on and never had a problem starting it again.

[@lonnievalencia5487]

Great video, on patience, persistence, thanks for sharing some of your knowledge with us. congratulations on not flinging the saw against the wall out of frustration, great job!!!

[@simpleman4224]

Great advice!Great video! Thanks for sharing buddy! 👍👍👍👍🇺🇸🇺🇸🇺🇸🇺🇸🙏🙏🙏🙏

[@4550andre]

Brother espetacular work you do with this Chanel ….i learn a lot in arborist site and other but this work is another level …now a prática 61 on moding and a stihl 044🙏😉👍 Thanks Brother Andre Campos Oporto Portugal

[@5150powder]

Its true as true. I put an aftermarket carb on my 044, just because I had it laying around and thought hey let's see. I was sure my saw had a leak.. just would not tune at all. Terrible. Put my OEM carb back on. Instantly back to business as usual. I was so relieved. And learnt a good lesson.

[@SonOfLiberty1984]

I always have the need to go out to the shop after these vids. I too have sang the aftermarket carb blues.

[@poparamiro]

Great video! 2x G366, one best AM carb i seen, holds tune, everything perfect. The other G366, each day different tune... airleak simptoms....

[@logman6656]

Hi tinman iv been away hopefully I can catch up .I had a bad coil gave symptoms got new one all good

[@TheScoundrel70]

I just had a strange one with a Husky 55. Very similar symptoms. I was getting random leaks around every one of the copper pipes going into the carb body, but they would come and go depending on whether the saw had run, cold start, warm day, cool evening, ... the most thermally temperamental glitch I've run across on any kind of engine. It would tune, then it wouldn't. It would idle, then it wouldn't. It would start, then it wouldn't. I ended up putting JB Weld around the base of every one, and it now seems to behave, but I have no confidence in how long before some other quirk presents itself, so I told the owner to watch for a donor saw, or buy a factory carb. The saw wasn't new to him so he was surprised to find out it wasn't a factory carb. He had a case of sticker shock seeing what a new carb would cost to put on his free saw.

[@dandube6171]

I rebuilt a husky 51 using an aftermarket carb you nailed 100% the symptoms I was getting I rebuilt the original and the song runs like a top

[@MrHuntermikey]

Thanks for telling it like it is Tinman.

[@nathancannon2235]

Carbs are the brain to a engine especially small engines

[@bobcat7541]

Time is money. Short cuts always take longer. Aggravation kills. Thanks for sharing 👍

[@ronmorris367]

I agree with you about the after market carburetor. I bought a s&s clone. Bottom line you get what you pay for. I put the s&s og back on much better.

[@JoeRainis156]

Tinman I have to say this is one of your best video’s you have put out. It shows that you want your subscribers to rally understand the importance of troubleshooting and eliminating the obvious before you solve the real problem. Well done!

[@lisashier5568]

We knew you would! We had no doubts Tinman!

[@sundial6919]

Your tutorals are sone of thest on utube and know you will continue to grow in saw expertise and and to get straight to the simplicity of conveying thorouh easy explanation for us to easily understand the 1st time instead of rreaching other vids to read between the lines to finaly undèrstand .keeo up the good work and growing

[@jamiedalluge9472]

Jst went thru that on a 268xp. Had a brand new china carb when I bought it and ran erratic. Threw a good used 272 carb on off a parts saw and runs like a champ

[@marknash7113]

Too many of us have lost days fooling with the aftermarket carbs and thinking it must be something with the tune or a leak. Be honest. How many of you have thrown a saw in disgust? Thanks for the info and the statistical failure rate of these pos carbs. Got an 020 that I bought an aftermarket for. I'll rebuild the original instead. Thanks for saving me alot of hassle!

[@waynetetley584]

Tillotson transformed my Stihl 045. Great video. I'm with you on that

[@lsohweldfab6575]

Awesome sauce brother, being familiar with engines but not the particulars of a saw I really appreciate all the information. Blessings brother 😇

[@charleswilson577]

Would love to know how you pressure and vaccum test. Great videos.

[@DaveyBlue32]

I’ve had great luck too... but I’ve done some research from the supply. The crap diaphragm is the issue I believe so I always keep a couple kits ( Hyway brand because they have supplied the Stens line with decent aftermarket parts for years... Hyway has pretty decent quality control... I love the “fish gill muffler and I’ll be stealing that

[@lloydholt6511]

Just a few of the Problems I’ve experienced with aftermarket offshore carbs include: Throttle shaft bores drilled off center/oversized Jet bores drilled off center/oversized/undersized Casting porosity Jet screws not concentric/ screw threads on different centerline from point of adjustment screw Bent throttle shafts used in oversized throttle shaft bores And I’m sure there are more. If they make tuning an automotive engine unpleasant I’m sure that you chainsaws would be more sensitive to these issues. Just the findings of an old man rambling along.

[@TonaldDrump686]

Likely why my only aftermarket HS260 won’t lean out properly.

[@Indeewoods]

Yep same experience here with various aftermarket product. It’s like brake cables for atv’s or dirtbikes or e brake cables for vehicles. Aftermarket never work they are to long or to short. Had a chance to buy an aftermarket carb for an MS250 recently but read about all the problems. Bought an oem and it works great. You get to know what works and what doesn’t in the aftermarket world.

[@KainKustomGarage]

Excellent diagnosis sir!

[@williamcolon3647]

Great video Tinman I am 💯 with you on this aftermarket carbs. Sometimes, even when you can tune them to run half way decent there not even close on the H. L. Jets as the OEM carbs.

[@tinstaflxp5890]

FWIW I have found it better to get cheap (Ebay, etc.) kits and rebuild carburetors (that have spent a long time working well) than to just get a new carb (often even than to get a "parts" OEM / dealer carburetor). Many times, for just an example, the metering side diaphragm has gone stiff (e.g. from alcohol in fuel) and all the other things about the carburetor (needle valves / "jet screws", etc.) will go right back to working fine. Basically these are just little cubes with a pump side and a metering side (and pump flaps that don't work at some point, and the screen that gets clogged with stuff that made it past the fuel filter somehow... I have even had a carb that clogged because there was a coating on the welch plug that softened, turned to goo and clogged the carb). Figuring out a carb that has been badly made, mis-drilled, hole in hole not centered properly, bits of metal leftovers, not-flat mating surfaces.... is -- to me -- a harder challenge than dis-assembly, cleaning, examination and install of distinctly serviceable parts (nothing 'questionable"... diaphragm stiff, but since you can't see a hole in it... or you doinked the spring putting in the lever that operates the needle... etc.)

[@wg4405]

The Mom and Pop Lawnmower Shop that is a Stihl Dealer down here on the Gulf Coast of Texas that I deal with has told me and we have discussed it many times that Stihls don't like after market carbs at all .They have told me it's hit and miss if you do put a after market carb in a Stihl . I've tried after market carbs on the Stihl 4 stroke weed trimmers I have and they don't like them at all ( had to get OEM for them ). I've had good luck with after market carbs on Echo's though .

[@lawrenceharris4704]

Stihl owns Zama Carbs, which are made in China.

[@shelbywilson114]

Tinman in my opinion this is the best video you have made to date. I work on two strokes as a hobby. Very informative ty

[@shelbywilson114]

And I agree. Don't buy aftermarket carbs whatsoever

[@tinmanssaws]

Thankyou for the kind words

[@sebastianleicht]

That's my thought too. Some of them work, some of them leak. I found that there are surfaces on pump-side where the diaphragm is seated directly to the block are to rough as well as on the cylinder side. Sometimes they are not straight (or is it "plain" in englisch?) I always rip everyrging of and Sand that surfaces. Sometimes the threads of the H and L screw bores are (... 🤬...) than a drop of locktide fixed the issue (may work or not) in one case they drilled the thread for the fastening screw of the metering side cover so deep and in an angle, that they did hit one of the bores inside the carb so it sucked air there. Sometimes after cleaning them in sonic i found metalchips from drilling in the water. I dont like the aftermarket carbs and only work on them if there is no orig. available or a friend asks me for help (in that case it is a question of honor and i'm taking it as a competition 😇) Nice work tinman, I can't wait to see that saw ripping wood! Thanks for sharing!

[@luddy2009]

Couple questions for you Tinman: 1. What's your favorite saw of all time? 2. What would be a good saw to build/port/etc to run a 36" bar for felling and firewood? Looking for something that will take a beating.

[@Brian-my3gd]

Went through 3 aftermarket carbs and multiple pressure/vac tests on an 026 before I broke down and bought an oem walboro for like half the value of the saw.

[@retiredwelder]

Nice job. Your really doing a wonderful job doing this. Your helping so many people. Your so comfortable in front of the camera explaining things now. Wicked proud and happy for you and how far your channel has come. You Tin Knockers are good people lol. I worked with hundreds of them at the shipyard. All great people. You should see some of the work they do on ageis and zumwalt destroyers. Talk about moving air!! Hehehe. Have a great day bud. As always WORK SAFE 😎😎

[@thebustedwedge1141]

Very interesting! I was leaning more towards the exhaust not being open enough after the port work. Lol. I would’ve never guessed the carburetor was wacky. Great video as always Tinman! 🤙

[@trevscoins1353]

That’s a nice 266xp tin man nice job

[@Mooseracks]

Just subscribed...I respect and enjoy the way you explain things...HAMMER IT HOME....LOL

[@jimmyanderson2609]

Jimmy J here in Tennessee. I ran into a problem very, Very similar to the one on aftermarket carbs but mine was All OEM stuff and guess what the culprit was? ----- The Doggone Tank Vent.!!! I about pulled my darn hair out before I realized what was actually behind it all. Just thought I'd give another scenario of a problem similar about idling and losing its tune real quick like. Yall take care out there!

[@CharlesBrisco]

I've had it be hit an miss on aftermarket carbs I try to stay oem when I can but somtimes you can't then I buy 3 or 4 at a time so my odds are better at geting a useable one lol she sounds mean I can't wait to see it in some wood

[@scottfritz2231]

I would question the quality of the metal that the aftermarket carbs are made of. An example I've had is cutting threads on pipe and tightening fittings on the pipe. I've had good initial seal no leaks days weeks later with variety of temperature changes I've got a leak.

[@kevinmaxam2414]

Great info and vid. Be safe and be careful.

[@jeffreyrubish347]

With puzzles like this who needs Sudoku? 😉

[@jimmyanderson2609]

BTW, the symptoms are actually quite opposite but sound kinda the same. The saw seems to be more lean than on the rich side but has a distinct characteristic, besides loosing its tune constantly, it'll run fine for a while and you turn it off and set it down and guess what,? It will barely start or maybe not at all. Check yalls "Tank Vents" also on a crazy tuning problem like Tim just talked about to make sure it will let air Into the tank to replace the fuel that has been used. Some are hard to find but about all of them are a form of check valve. Mostly what is called a "duckbill valve". (a very small valve) It only let's air back into the tank one way. TIm, that was a Great video! I love watching your channel. I've learned a whole bunch on a whole bunch of different topics but I just had to tell about a similar problem I had that drove me Nuts! 🤪 I swore you were going to say the tank vent was stopped up as I watched the vid but you are Absolutely Right on "Afterbirth" parts! 👎 THEY SUCK!!!!! 🤮 TAKE CARE and I'LL SEE YA MY FRIEND!!!!!!!!🙏🏻🤚🏁💯😎👍

[@byrontjrcooley1857]

I've seen aftermarket carbs leaking air around supply lines.ive put jbweld around lines and the carb start working fine.

[@ChippyOutdoors]

Had one pulling air at the butterfly shaft, stumped me for a few min when I was looking for it

[@SOHN32]

Try using the block of carb. See if you can put a genuine husky rebuild kit in it. See if maybe that help fix the issue. There needs be a way fix the junk stuff some how. Specially if aftermarket the only way get parts. That or I like have a go at it when I get around to playing with the saws also.

[@whatnowstinky]

Ooooo a future 385 build! As i have a 385 i haven't been game to port i am very much looking forward to that one.

[@wichywoo]

could the aftermarket problem be poor quality diaphragm and pump gasket which may distort or stretch over night once fuel has been through it ?

[@StevenLettsPerformance]

Yep all my life I work small engines very rarely have I gotten a good aftermarket carb.

[@aldredske6197]

Hi Tinman!!😀😀 One of my ms460s acts the same way as that saw was. It has a OEM carb on it and has been rebuilt. Once you get it adjusted properly it will run okay for a few minutes and then it's back to being all over the place. It has had new seals put in it and it passes the pressure and vacuum tests. I'm wondering if my OEM carb has just crapped out.

[@tonymayhew191]

I have a 330 homelite that is in awesome condition! I found out why when I started disassembling it. It appeared that someone had broken off the end of a thread tap in one of the holes that mounted the carburetor to the manifold. It wouldn't allow one of the carburetor bolts to go down far enough to tighten one side causing an air leak! Some unfortunate customer bought the saw new and never got the chance to enjoy his purchase and got frustrated with it and threw it on the shelf and joined the hee man homelite haters club for the rest of his life! I have also seen where they ran a reemer bit into the bore of the carburetor and it smeared aluminum across the tops of the two holes on each side of the throttle plate that meter the vacuum for the low and high speed jets! And all they would have needed to do is do a little research and learn about the piece of equipment they owned. Enstead, I come along forty years later and since I have a bit of knowledge about chainsaws and carburetors get to enjoy the chainsaw that they worked there ass off for back in the seventies!And as fortunate as I am to own the collection I have of these vintage chainsaws, It saddens me to think that the poor man who happened to get the unit with a flaw right from the factory never enjoyed his purchase and was never a lover of that brand of chainsaw again im thinking.

[@brucewatson1217]

Hey 10 man do you have a video how to vacuum test that’s all? Sure would love to know how to do that because I have a Saw it keeps running lean on me and I want to make sure it’s not a fuel issue with the fuel line let me know what you think about this comment I appreciate everything you do for us because you have helped me more than you know thank you buddy keep up the great work thank you for helping me your friend Bruce from the USA sure would like to come see your side of the country one day !!!

[@ChippyOutdoors]

2 for 2 failures on AM carbs that was enough for me

[@fearlyenrage]

info: The clone carburators dont use high quality gaskets materials. They swill up or shrink thats why they are not relayable. Same with the rubber tubes, high quality is key here and to research those plastics had cost a fortune. Thats why there is a fabrication secret in makeing them. There is a very good reason for high price, quality runs.

[@sundial6919]

My brand newg372 blue china doll exhibits these symtons strsight outta the box have diligentl loked for air leaks . It must be the carb . I raise needle lever slighty and it helps but underlying problem seems to be defected flaps on pumps side pules side of carb , very thin and cheap thin looking ** also need to check tank VENT but dont know where it is

[@Banjoandguns]

I had a brand new 2020 372 xp act like this I caved and took it to the mechanic they replaced the carb and it works fine

[@LoneWolfFirewood]

I tried an aftermarket carb when I built my 395xp and same thing, COULD NOT get it to tune. Spent the $130+ on the correct OEM and I got it tuned in minutes.

[@markqueen4201]

tinmam, I have a Homeliten super xl what would it cost me to get it freshened up not a screemer but just a good reliable saw,I allways loved this saw

[@michaelwhiteoldtimer7648]

i see why i might be havin trouble keepin my saw running, have to adjust the carb everytime i use it

[@tracedavis4007]

Aftermarket carb is what killed my 288xp last time.

[@daninuesca3801]

Hey Tinman, got a Jonsered 670 champ that has a272 oem cylinder that's woods ported with.a pop up piston and an aftermarket proline 390 carb with impulse line installed on the isolator block. This thing has an Acher 36" bar & a full comp chain & this BEAST dials in at 26500 W.O.T. on the tachometer! Nice work buddy! Stay kind everyone! Mahalo, ALOHA from Maui!👌🤙🏾😎

[@daninuesca3801]

Also has buckshot Muffler 😲

[@ToddAdams1234]

WOW, 26.5K will surely blow out your crank bearings. Was that an accidental number or do you have it WAY lean, and what is the RPM in the wood like?

[@daninuesca3801]

@@ToddAdams1234 i got numbers from Kevin Lavanway..I also bought a 670 from Ronnie Lamb that has 272 oem cylinder thats been woods ported,go check it out. Didnt time it wood..

[@daninuesca3801]

@@ToddAdams1234 Thats my first ported saw..

[@jensenwilliam5434]

Thank you!!

[@stanleybennett8879]

I have a carb. that the welch plugs don't fit right! and it run like your saw!

[@grifonks]

The usual issue with these old oem carbs is leaking welsh plugs or bad main nozzle check valves. I put 385 carbs in ported 372's

[@stuartramage5933]

Nice job tinman . I have a 268xp would u consider porting this saw for . Is that something u would do stu

[@kyleandrews1713]

Hey guys Kyle in Calgary have a wonderful day!!!

[@claytonshowalter4457]

Great video Tinman keep up the good work

[@bentwedgestanleybrand5818]

Hello from Piqua Ohio

[@sundial6919]

You mentioned everything but fuel tank vent if dont open creates vacuem and supresses ful flow to carb

[@mikahakkinen5651]

carburetors can be very straings sometimes.last week a get a saw,the customer says it would not idle. ok a test thesaw and tune it.it did run ok.next day the man coming back it would not work. well a did change the diapgram and clean the carburetor,still not working.then a did change the carburetor and works fine again.and this was pretty new husqvarna saw.

[@ozdatman]

Good video. You know we are going to see that price though, and the mouse will hover over the buy it now button. Hopefully Tinmans words will come to us before the checkout does. Cheers mate.

[@tinmanssaws]

Hahaha yep

[@treharneable]

I use am carbs on some saws. They seem to get better with time oddly enough. My theory is that there is milling debris in them that needs to work itself out or somewhere, I have a few carbs now, 4 I think, that are cheap Chinese carps and all work quite well. Not at first but after a week or so they seem to sort themselves out...all of them. Really weird I know but my experience

[@jonathanhall136]

Good work Tinman.

[@sundial6919]

My g372xp dont have air tight seal around metering jet screws but remedied that by splitting fuel hose and peircing around needl an using sprin tension to hold in place

[@richardmiller4104]

Have you tried doing a fault find on them carbs. Try an oem carb kit on the aftermarket carb body and run the aftermarket kit in a oem body and see if its a poorly manufactured body or kit?

[@mikeluckett602]

Bad carb body material ,the heating and cooling cycles shrink and expand the orifices in the carb so the settings are never the same.make the carb body out of 6160T6 or a better material. Hope that helps.great video thax.M

[@smalltownwrenches4477]

great video Tinman ! as always very informational and great tips! keep the videos coming! just curious did you tear carb down and notice anything? did dirt happen to make it in there ?

[@thomasgronek6469]

Agreed: I bought an aftermarket carb which seemed to work okay so I bought several more as needed for other saws, , ,, After being completely frustrated with each one, I put on a working used Walbro, it ran GREAT, ALL THREE [aftermarket junk] went DIRECTLY into the TRASH, immediately. I will NEVER buy, or use an aftermarket carb again.

[@joelnash5692]

Sounds alot like needle valve height trouble with that after market carb. Either the height needs to be played with /diagram is to weak or even meter lever spring is to weak.

[@ironwoodworkman4917]

This video is just one reason @Tinman is the Man :-) Good work friend and Thank You for the info.

[@pantigersizzle5761]

Tinman, could it be the springs?

[@billnlori3149]

Are there oem carbs that are better or worse?? Zama, Tillitson (sp?), Walboro?? I've been fighting with a newer John Deere saw made in Italy with a Zama. Can't get a new carb.

[@willsmith1988]

same with my carb idle screw would self adjust

[@olivierj.2435]

Tinman, did you measure/set up pop-off pressure on this carb ?