Find out here why most Stihl chainsaws leak bar oil; kzread.info/dash/bejne/pKBhm7KniLCqe5c.html Watch my video on how to replace an oil line on a Stihl ms170/180 here; kzread.info/dash/bejne/g52tuq-RfbvQiqg.html

That's just amazing that it was still pulling almost 150 lbs of compression. Speaks volumes of the quality and craftsmanship of Sthil

We learn from our mistakes. It is refreshing when people admit to mistakes so others can learn.

Hello sir, I also work as a mechanic, I have learned by looking at you, but I do not have the tools as much as you, I do the great work of someone else.Thank you sir, I am from India, Himachal Pradesh, I am from Kullu Manali, I have seen every video of you, love you sir, keep making such videos thank you

@donyboy73

3 жыл бұрын

greetings from Canada!

@HimBoys

3 жыл бұрын

@@donyboy73 Thanks you sir ji ❤️❤️🙏🙏🙏 lot of love

@micanopykracker902

2 жыл бұрын

This guy is the shit huh??? He knows his business👍🏻👍🏻👍🏻 cheers from florida

I wish I could see this saw being rebuilt! Gosh, I would donate $5 at least to watch a 1 hour video on you doing a rebuild!

@donyboy73

3 жыл бұрын

really?

@andrewford80

3 жыл бұрын

Me too. Sign me up for the rebuild

@Paradise_Arms

3 жыл бұрын

Likewise

@billbkr32ify

3 жыл бұрын

Seen that alot in weed eaters. The cylinder expands when it gets hot and there goes your compression. Did you check the compression when it was hot? Bet it would of dropped half of what it was cold. Great video

@SuperJamster1

3 жыл бұрын

@@Paradise_Arms Me Three!

I have fallen for the “hang” test myself only to pop the muffler once home to find exactly the same thing. Great video!

Oh boy I hope we get to see a rebuild in this chainsaw. Looking forward for it. 👍👍👍👍

That is amazing. I guess that advice would be beneficial for really any piece of lawn equipment. Most people don’t run used equipment long enough for any symptoms to show up. Thanks Dony! 👍👍

@donyboy73

3 жыл бұрын

absolutely, have a great weekend!

Great advise, Pull the muffler and check the piston and rings. I think the high compression came from the tremendous power in your pulling arm. Somehow you are converting pure brut strength into high compression. Keep the videos coming, still learning.

Came from Buckin's channel, awesome advice! Thanks for sharing, God bless

Hey Don, thanks for this advice! I´ve never seen a defective like this hole in the piston jet... Incredible that this saw was running. Greetings, Stefan

Great tip Donyboy. Removing the muffler tells the story. Previously my shop has wasted alot of time trying to find the problem. Now it's our policy on 2 stroke equipment to remove the muffler before doing anything. Amazing how much compression that saw in your video had. I used to go by that before, but not after watching this video. Thanks for the advice. Great following your videos 👍

@donyboy73

3 жыл бұрын

good idea Robert!

@em4703

Жыл бұрын

That wear is still not normal, even with thousands of hours of run time, the wear should be slow and a "smoothing" and thinning out of the piston skirts. Scoring should not happen if piston and cylinder is properly lubricated. It got that way either from the airleak making it run lean on fuel, or the gas-oil mixture didn't have enough oil. I would never put 50:1 in 2 strokes, only 40-32:1. I care more about longevity than what the environmentalists say.

I have the ms 460 magnum ive had it 15 years i only had 1 time it didnt start i changed the plug it never misses a beat

Great advice that I would never have thought of.

It's happening to me with my 2 stroke snowmobile this winter. Nice video thank's for the advice.

In 50+ years of working on saws of all kinds, I've never seen 1 with a hole in the piston but I have seen more than 1 with the piston dimpled/cracked from using an impact with a metal piston stop before. 1 other thing not related directly to the saw is the wear & tear on your shoulders from 50+ years of yanking on 'em especially the stout ones.

Same occasion with my Homelite CSP4518! Apart from the hole thingy... Awesome compression, new spark plug, new carb membranes, but when I removed the muffler... The absolute chaos in there!!!

Another top notch video. Never a wasted second; always informative.

Great video. Big diesels can also seem healthy and not show excessive blow by... until they get up to operating temperature.

Always learn when watching a pro...thank you.

I knew this would be a hit! What a crazy sight to see!!!

after seeing all the scoring and the hole in the piston its amazing it still even runs

Awesome Don! Thanks for making and posting this video. Another great example of why to remove the muffler. I can't believe the saw actually ran, with the piston and rings in that shape!!!

@donyboy73

3 жыл бұрын

I need to listen to my own advice lol!

You are right - annual checks on well used saws are a must. That is why I have a Mighty Vac. I just finished building a 372 and it did not run for the first time without passing a leak down test. I have found one of the worst places for leaks on Stihl saws is the connection between the boot and the carb. I usually crank up my saws and spray break cleaner in this area to make sure it is still sealed. I like the system used on the 372 better than the loose coupling on the Stihl which is dependent to much on nut tension. And the condition of the boot.

@donyboy73

3 жыл бұрын

absolutely!

I had no idea that a chainsaw, and I guess pretty much any small engine, needs this kind of in depth checking and maintenance! I bought a Poulan Pro PR5020 that I still haven't used, but I'm going to have to remember this! Check for air leaks, cracked intake boot, loose cylinder bolts, etc. I'll have to learn how to do all of that. Do you have a video on this; the whole procedural annual check? Thanks for being you!

Absolutely fascinating! Thank you for the continuing education, Don! 👍

@donyboy73

3 жыл бұрын

Glad you enjoyed it!

Thanks for making this video very helpful and educational.

This is awesome advice. Thank you for sharing. 👍🇨🇦

Wow that is a massive beast of a saw. Looks a bit like the huge (German?) one my father in law has (has also done the firewood business, as well as doing IT for a small engine shop, saw was a gift from the owner's family after the owner passed, was apparently set aside to give to him for years). Interesting to see another cause of "runs badly when warm". Just fixed my leaf blower in the fall, had stripped crankcase screws. (And finally replaced the disintegrating asbestos exhaust gasket with one that won't give me cancer - amazingly that piston looked ok) Great video!

@turogkane5826

2 жыл бұрын

You can get even stronger Saws form Stihl :D but you dont want work withe that the full day :D the mostly used withe long swords for cut down trees than a smaler one to remove the branches

AND THE HITS KEEP ROLLIN'!

I really liked the way you showed how to troubleshoot that problem. You videos are such a pleasure to watch because you kearn so much. Good stuff.

The best advice vid ever about buying used chainsaws.

Wow I didn't see that one coming good job brother thank you once again

That was an awesome explanation, thank you Donny boy.

Good idea that I will use from now on..Thanks Donny ...

Thank you for the great information.

Great video. Thanks for all the knowledge!!!!

@donyboy73

3 жыл бұрын

thanks, have a great friday!

Very interesting and good advice. After everything the guy replaced, my experience would have gone straight to worn crank seals, of course a leaking jug gasket would have presented itself when diagnosing the situation. I would never have considered pulling the muffler and inspecting the piston, especially when you have good compression. I learned something new today and I am not afraid to admit that I can add that to my 30 odd years of learning and knowledge. Thank you for sharing that information with us.

The fuel ignited in the crankcase and blew a hole in the piston, Stihl is known for this issue, but I'm amazed it still runs 😂

Great advice, thanks Don!

Thank you for excellent advice! Once again I have learned potentially money saving tips from your videos.

This was great information, and a practical lesson on diagnosis. Seeing that piston reminds me that internal combustion is a frickin' miracle at times! Best wishes from Ottawa.

@donyboy73

3 жыл бұрын

unreal eh?

Thank you for the good advice.

@donyboy73

3 жыл бұрын

thanks, have a good weekend!

OK The hole in the piston surprised me. Great demo. I can't believe it even ran. I have made the same mistake.

@donyboy73

3 жыл бұрын

same here!

WOW! Amazing it worked that good.. Also in glorious 4K :)

You really should listen to that Don fella, he has a lot of valuable experience.

Hi Dony, I have a Solo chainsaw that runs great when it's cold then runs badly when it's warmed up. I'm pulling the muffler. Thanks for this video.

Unbelievable !! Amazing that it ran. I have had carbon scored saws act that way. But never had one that ran looking like that. Awesome video !! 👍

@donyboy73

3 жыл бұрын

thanks Michael!

diagnosing my old 441 magnum /arctic firewood saw and this video really showed what to look for first . on my teardown the crank seals are exposed and are worn out next i am no going to taking off the muffler to see if there is a problem in the cylinder and then deciding if a reseal /repair /rebuild is needed as it is around 20 years of seasonal use with only clutch system parts ,bars ,chains ,filters, plugs. not sure the new ones are actually the way to go vs the cost of rebuilding what has been a basically trouble free saw 🤔

Awesome information thanks for the tip ! Wow a hole crazy !

@donyboy73

3 жыл бұрын

insane isn't it, this saw has paid itself many times!

Wow ! Excellent advice Don....Merci beaucoup !

Thanks for the video don!! You help me a lot with your knowledge!!

@donyboy73

3 жыл бұрын

Glad to hear!

Awesome tip!! Thanks Don!!

Great tip. Thanks

Thank you for the insight! I have a weed wackier that may have the same issue! I will look.

A most valuable vid for the consumer. Will save viewers from buying junk.👍

Great advice about taking off the muffler.

@donyboy73

3 жыл бұрын

I should have done it right from the start!

Excellent work. Thank you.

@donyboy73

3 жыл бұрын

Many thanks!

Excellent advice!!!

Great video Don! I was betting on the crankshaft seals or the cylinder bolts being loose. Just goes to show how you can’t be too careful when buying a saw. Wow I can’t believe that piston was in that shape with that compression reading. Crazy. 👍

@donyboy73

3 жыл бұрын

I couldn't believe it either so it really threw me off and I wasted so much time on it!

Good vid. Got an MS441 and really like it.

amen! first thing I do to EVERY saw I service. also, if the saw is 20+ years old, automatically gets a pressure vac test. you can throw new carbs, filters etc at them all day and if they're sucking air, you're wasting your time

Great advice. Thanks!

@donyboy73

3 жыл бұрын

thanks Richard, have a great weekend!

Great info, thanks mate!

Yes, lots of videos covering ongoing saw maintenance but you quickly listed several things to check (air leaks, etc)I don’t normally see included. Maybe warrants another video. But then again I’m now rethinking saving myself time, money and frustration by not spending lots of money on pressure gauges and the rest. Can’t believe I’m saving this, but the writings on the wall, time to get a battery powered model. Money saved not buying tools would easily cover getting into a new battery and charger system.

I'm glad you made this video cause I naught a husky 262 last fall and iv been having a lot of trouble getting it to run it's got compression but I looked at the exhaust side a few weeks ago and it's scored pretty bad. It was suppoaably just rulebuilt with new piston and rings and carb may be new aswell but cylinder is one. I believe I don't know how it got so scored the gas i put in was super rich

I've got a 441c thats 10 years old and alot of firewood and chainsaw milling behind it. It's still running ok,but when I tuned it up this spring I checked the compression and it's down to 130psi. It's still got some life left in it but I'd love to see a rebuild video on it for when the time comes. I'd be torn between a $399 oem top end or a meteor kit for $150.

Thank you!!

Hi Dony, that confirms that compression test, manual by hanging (or with manometer), is not reliable, except when the saw falls easily, so rings are dead or oval cylinder or both. It often happens that piston and rings are scratched even with a good test . So you are right : we must take muffler off!

I had a similar problem with Jonsered 2156 piston was bad burned, but chainsaw run exelent. Great video. Pozdrav

never ever seen that. but it makes sense. my initial thought and it could be as well on an older saw is a case pressure leak. with the hole in the piston until the piston drops below the exhaust port it would vent case to exhaust. thus lower pulse pressure and reduced fuel. one thing to note on the compression guage- husqvarna in their manuals want you to use their guages. the hoses are shorter (like really short and smaller volume). first they only want 3 pulses to get the reading and second it eliminates a lot of pulling. any guage if you pull long enough will give you a maximum compression but with fewer pulls it makes compression loss from worn rings and cylinders into consideration.

@donyboy73

3 жыл бұрын

good info, thanks!

Thank you Don!

Nice lesson learned donnyboy!

Thanks Don

Good advice I allways take muffler off first thing to check 2 stroke

Good advice!!

Good tip dony 👍🏼

West Coast Muscle Saws has a video on this very issue. Excellent stuff.

Awesome video just flat wonderful!!

Great video Donyboy73!!

What a video! Now that's my man; super super tip when buying a used chainsaw. So, I consider myself lucky 'cause I bought 2 and they're running just fine.

Awesome video!!!

Great vid!

amazing, I'd have guessed pulse line

I spray all the areas that normally leak with break cleaner while the saw is running. If you have a leak the saw will stop dead when you spray it around an area that is leaking. I spray the carb and boot area, the base gasket flange and the oil pump and flywheel sides. The last two will check the crankcase seals. If anything is leaking, the saw will stop, immediately, so you will know what is leaking. This saves a lot of time pressure testing the saw with a Mighty Vac.

Excellent advice buddy 👍

@donyboy73

3 жыл бұрын

thanks David!

Well done.

That is surprising that it had that good of compression with the piston and sleeve in that condition. You give some good tips as well donyboy!

@donyboy73

3 жыл бұрын

yes I couldn't believe it ran like that!

D @ D. My diagnosis was completely wrong. I was visualizing bad ignition coil, after it heated up. I used Sthil 440 at work a lot, loved it. Can't afford one in my retired years, but I've been happy with poor man's Echo Timberwolf 590. :).

@donyboy73

3 жыл бұрын

your echo is a good saw

@SuperJamster1

3 жыл бұрын

@@donyboy73 Indeed!

I went to buy a couple saws and asked ahead of time if I could pull the mufflers. No problem in fact one saw was scored and I got it for next to nothing. But I have had sellers refuse so ask before you take a long trip to see a saw because not all sellers will let you take it off. The honest ones will. Great video. Simple things first!

@donyboy73

3 жыл бұрын

good tips Ken!

@wingerrrrrrrrr

2 жыл бұрын

Is it recommended to change the gaskets when removing and reinstalling the muffler?

@KensSmallEngineRepair

2 жыл бұрын

@@wingerrrrrrrrr only of they are leaking

Our shop had a 441 come in with a larger piece of the skirt missing and it ran as well. It wouldn’t idle, but it will run at full throttle.

Nice catch, always go with your gut

I'm still wondering how it had good compression! Was the muffler partially blocked off from running it with a cracked intake boot? That's amazing. I just got through working on a blower that wouldn't run & i thought it was a carb issue so i was taking it apart & while doing so i saw that the intake was loose & that was the problem. But yeah its not always the carb @ fault! Thanks Don for your vids, Always good info & helpful.

@donyboy73

3 жыл бұрын

muffler was not blocked, I think it still ran because Stihl has 2 piston rings instead of one like some husqvarna saws!

Good diagnóstic stihl

Excellent video 👍✔️✔️

My chain saw is corded electric since I only use it about once every 10 years. Stihl is a good brand gas chain saw.

Sometimes scoring on the exhaust side can be from overheating due to either the spark arrestor being clogged, or running the saw with a dull chain.

Awesome tip sir!!Now a question ,Do you or any other viewer have a gas tank ,Handle assembly for an older Stihl 066 saw,I need one for my old saw real bad and cant find one.I will check back on the comments.Thank you !

@donyboy73

3 жыл бұрын

no i don't, check ebay

That there is a good marketing tool for stihl. My goodness that thing should have even started let alone cut...i actually bought a used Husky...exact same thing happened to me . I knew my mix was right I cut maybe 2 hours with it and then I checked your video and Steve pull that muffler and it was and it was scarred up . I didn't have a dime-sized hole in the Piston but it still ran kind of..but still have good compression I couldn't understand it..would you rebuild that saw??? Seems like it would be worth it.... great video Donnie

Gud 1 Dony 👍🏼