How To Tell WHY Your Piston is Destroyed
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- Опубликовано: 4 окт 2024
- How to analyze the failed piston to determine the cause. Why is my piston scored on my chainsaw? Applies to 2 stroke, 2 cycle lawn and garden equipment, including weedeaters, trimmers, leaf blowers etc...
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Learn how to properly fix or repair your own outdoor power equipment if it won’t start, bogs out, won’t rev up, chain or blade is dull and doesn’t cut good, needs sharpened, or simply just runs poorly.
Simple and basic, do it yourself (DIY) tutorials to help you with your broken lawn and garden equipment.
I do my best to teach you how I easily diagnose problems the fastest, quickest and most efficient way.
Whether it be a handheld, two stroke, two cycle engine like chainsaws, weed eaters, string trimmers, grass trimmers, line trimmers, hedge trimmers, strimmers, brush cutters, leaf blowers, or four stroke, four cycle units like lawn mowers, pressure washers, generators, ride on mowers that need parts installed or replaced, I’m your guy.
I’ve been a small engine mechanic for many years so my videos are loaded with tips and tricks that I have learned and want to pass on to you. I want Steve’s Small Engine Saloon to SAVE YOU TIME, FRUSTRATION AND MOST IMPORTANT, MONEY!
If you Google your issue, problem or symptom, you may just see one of my videos pop up! If you have an idea or suggestion for a video, please fill out this form---- www.stevessmal...
Disclosure: This RUclips video is provided for informational purposes only. Steve is a qualified small engine mechanic and is working in an open and fully ventilated shop for the purpose of making this video. Small engines should be operated outside in fully ventilated areas only and it is important that you wear the appropriate safety gear. If you choose to try one of the suggestions made in this video, you do so at your own risk. Please ensure that you take all proper safety measures before attempting any project.
Get new piston kits here--- amzn.to/2kbqoaT
Click here for my website--- www.stevessmallenginesaloon.com/
Click here for my Parts and Tools Store---- www.amazon.com/shop/stevessmallenginesaloon
You can see the "cheat sheet" report in the "community" tab on my channel!
can you do a vid on proper break in of the 2 stroke. Before I ever start a new 2 stroke I pus some 2 stroke oil directly in the cyl. then do heat cycles and then varying loads for the break in. I also use full syn but mix very rich for break in
where is the "community" tab on your channel? I just always watch your new videos via the little bell notification.
Never mind, Steve, I found it. Thanks for your response.
Excellent video Steve, Thank you! Good visual for us on chart examples and close up examples from you with elaboration. THIS is how information should be passed on in a video!
@@kenstaring6257 r dex is Hi hi hi hi hi hi hi hi hi hi hi hi
I'm a retired Echo and Husqvarna certified tech. Of all the small engine repair videos I've watched, yours are the most accurate in my opinion. Kudos!
What a compliment! Thank you so much my friend....
@ myz34 looking to be a small engine technician any info on how to go about doing that would be greatly appreciated I already know the basics well more than the basics but don't know where to start thanks
Watched again for 2nd time trying to get this info to stick as well as sort out the differences. I’ll never need to diagnose such things but it points out a more educated approach to using and caring for outdoor power equipment.
Steve, I have been fixing small engines for 30 years now. Whenever I have a chance to learn something from someone I enjoy it. Great video. Not dry at all. Cheers
Thanks for sharing
@@StevesSmallEngineSaloon does a crankshaft goes bad
Learn about small engines is NEVER boring, Never.
Right on
True you have to love it and enjoy what and why
Tools are high
I wish you could make a course for 2 stroke dirt bike owners. These people warming up their brand new bikes are destroying their $12000 machines then blaming the manufacturer for c***** engines. It's all over RUclips and it's crazy and I see it all the time. As soon as they fire them up they rev the cra out of them. And claim this is how all 2 strokes should be warmed up. Much education is needed in this department. Awesome video thanks
Yessir Steve is great I wish I was his neighbor, not just to get EXPERT advice about my two-strokes but just to sit around drink a beer and conversate. Great video as usual, keep up the excellent work SteveO, your the man!
Thank You...
All good advice, one thing I would add is that any type of piston failure that scores the piston is most likely going to send debris off the piston down in to the casing and end up on the con rod and or main bearings.
Be sure to do a good rinse and flush out of the crank bearings and close inspection and feel of the bearings.
Turn the crank to make sure the main bearings still feel smooth and free of contamination and shine a good lamp and use magnifier to look through the oil slot in the big end of the crank to look for fine flakes or tiny silver colored specks on the big end bearing and try to flush it out.
If you don't then the crank bearings may begin to fail and debris off them and or the bearing cages may end up scoring the piston and then you are faced with doing the crank as well as a second new piston and ring.
This video is nowhere dragging or boring, its actually very, very informative.
I have learned a lot. I'm a typical do it yourself.
After watching this video I decided to disassemble my leaf blower since it wasn't working, removed the piston, it had that varnish tar, I cleaned it really good, lube it put back and my leaf blower it back in business.
Right on Jose! Thank You...
Keep it up STEVE , I have worked on small engines for 42 years and your right on with your instructions! I like beer to!
Thank You...
The piston in the Echo backpack blower I got free had material pulled over the rings but in one spot about an inch wide. As this was my first two stroke project and was meant to sell I couldn't spend much. I ordered a piston kit from the only place I could find it but still have it in the box as I wanted to find why this happened and if I could fix the piston. There was a pencil tip defect in the cylinder that I gently ground away. I used a file to clean up the gouges in the piston and the ring grooves and sanded the rings on glass to get them flat. It pulled over so smooth and fired right up. So much for selling it as I need it now for some odd reason. Thanks again as this is on you like the free Stihl MS 170 I fixed for $20.
Edit: I, once again, wrote a comment way too early but there's nothing I need to change. I'm just happy Echo puts out information like you showed as I have a lot to do and have years of four stroke experience and a week of two stroke.
This was not dry at all this is good stuff and accurate, keep your jets a tad rich and 40:1 mix with quality oil!
I couldn't agree more...
I wish i had a small engine mechanic as knowledgeable as u Steve & as personable! 10 thumbs up
Also,.... warm your saw up.
I've been running Amsoil's Sabre 100:1 mix in my Stihl saws really hard and for years and LOVE it. Way less smoke and lost track of which gas jug was mixed, which one was straight gas and refilled my 1/3 full 1.5 gal woods saw jug with straight gas 2 days in a row. That is, I had a half gallon of mixed gas left in the jug after an easy morning, refilled it with straight gas, cut the next morning and had a half gallon of very diluted mixed gas left in the woods jug, refilled it with another gallon of straight gas and ran the next morning, wasn't till I brought the saw down to the truck the 3rd day and filled it straight from the straight gas jug that the saw siezed up.
@@mattobermiller5041 Uh, yikes! Poor saw that got the straight.
Appreciate the time and effort that you always put into all your videos. This one especially. On the cold seizure failure, the piston needs to expand but the cylinder needs to warm up too. Parts of the cylinder are not subjected to as much direct heating as other areas are. Clearance on the exhaust side of the piston is probably the first casualty of loading up a cold chainsaw. Again, great job on all the videos.
How could this be dry, I had 2 beers watching it!
Thanks ALOT steve!
Im an arborist and by watching you video i learned so much about chain saw. Im gonna share this with every one at work.
You're Welcome...
I had coffee with this (10 AM) and still thought it was interesting!
Already got my beer my friend
Just confirmed what id suspected with a second hand, almost pristine weed whacker i bought... Fuel looked like straight fuel in the tank & it has poor compression..piston is scored to hell so now looking for a new piston & ring to fit..
Great videos Steve.. keep em coming.. 👌👍
Just tore down my WR450F dirt bike after 3 weeks of riding in the dunes. Was still running but was smoking. Sand had made it past the air filter (after all per cautions) - cylinder was polished smooth and there was burnt sand accumulated on top of the piston = full rebuild!
Excellent video. Now I need to take apart my 2 stroke on my ‘83 Yamaha G1 golf cart to determine the cause for the failure. Again awesome video and easy to understand
Good luck!
The cheat sheet is just like a spark plug diagnosis sheet. Jugs instead of plugs. I like. Thanks Steve.
You're Welcome...
Commin from a goped rider, i love your videos, helped me out allot with my goped 46cc engine, thanks.
Cool, thanks!
So many comments! I didn't read them all but I didn't see what caused my issue with an old stihl 032AV. What happened, for whatever reason, my crank to rod bearing came apart and parts of it were sucked up into the cylinder with bad scoring results as you might imagine. Pretty obvious after tearing down but not so much so by looking through the exhaust port. Thanks for your very useful and thorough videos.
STEVE , YOUR A SMART AND FUNNY GUY, LOVE YOUR TAKE ON LIFE.....I,M A COFFEE DRINKER.....STAY AWESOME BROTHER !!
Thank You...
This and your previous vid helped me a lot. I recently picked up a husqvarna 130bt leaf blower off the street, don't start, its compression, bought piston/cylinder kit for 100$!! Thanks!!!
Great to hear!
@@StevesSmallEngineSaloon thx man, i am boycotting china!!! So the best thing I can do is buy individual parts from China in order to limit the amount of money I send to them, like...I bought the piston and cylinder for 100$..but if I bought a brand new blower unit it would have been 250$ so I limited my money going to chinese economy by 150$ !!!!! I figure this is how american manufacturing died... people buying parts instead of whole units... so anyway I'ts also good for environment :) because it costs less on environment to ship a piston/cylinder than a whole leaf blower unit!:):):):):)
Great videos Steve! Well done, educational, a bit of humor included. What more can we ask for? Many thanks for your time and effort to create worthwhile videos. :)
Thank You...and You're Welcome...
My brother brought over dad's old chain saw saying he was having issues with it. Got the muffler off and it shows lean fuel scoring. Love the videos, keep them coming!
Thank You...
Another great video, Steve, thanks! I'd like to add a comment for conversation and or comment regarding mix oil. Living on the coast and many boaters, I know folks who think it's just fine to run outboard two stroke oil for mix oil in their saws. As I understand it outboard oil relies on water cooling instead of air cooling and therefore the temp range of the oil's protective capability is vastly different. So, don't use it!!!
Really a great insight into piston problems . What does a piston look like after a well cared for life but has just reached its projected lifespan . I have a Stihl SH86 which I have had for twelve years , I replace everything but never done a compression check . I watched your video on compression and am awaiting delivery of a cheap pressure tester just to find out pressure .
With your unlimited experience , would piston and rings sort the no start problem , or would I need to replace cylinder as well . After inspection through exhaust port I see no scoring .
Thanks for all your videos , they have kept all Stihl machines humming for a long time .
The detailed info is outstanding , and the beer looks OK too .
Always enjoy your videos! Great to see a Canadian Beer represented ( Kokanee ) for us Canadians who watch all the time!
Thanks for watching!
I like to refer to it as Mechanical Sympathy. Love your small engine, take care of it, follow the correct procedures and it will last. Thanks for another great video Steve, cheers mate.
Thank You...
Brilliant Steve , I run all engines which not run every week with Alkylat fuel 2 and 4 stroke , not with environmental crab from the gas station ! Results : no gum no melted rubber hoses and gasket’s and so on , they just run since 42 years of infrequent usage .
Carburetor adjustment : max rpm and then go rich until the rpm is dropping ! Lean air fuel mixture = high burning temperatures !!
Skål from Sweden .
Awesome taught me a lot. I am 99% sure mine was overheating now, hopefully I can fix the bloody thing now
Right on...
So Frenching awesome Steve ,I'm learning so much from your videos .can't thank you enough ,don't ever stop making these videos !!! Thank you !
Great to hear!
I'm so happy to finally be learning about small engines. Thanks Steve! My Stihl Farm Boss is finally getting some much needed attention. My cylinder looks the overheated one, and yes, I'm surely guilty of cutting with a dull chain. Almost all the scoring is on the exhaust side, but there is also some on the intake side, lined up exactly with the piston ring locator pins. Why would that be?
Too dull or sharpened too aggressively will do the same thing. Brand new Stihl chains can be a little too aggressive for their smaller saws (of course, the wood being locust and requiring almost the entire length of the bar doesn't help either).
i started using blue boat oil mix so far so good I'm using it on a old test weed wacker 😁😁😁
Hi Steve. Thanks for all the videos. I've been a mechanic now for many yrs-thru the yrs a mix of cars and small engines. These days just small engines for a large landscaper in VA (along w/the hustlers and grandstands). Sometimes I like to watch to confirm what I know and sometimes to learn more of what I dont...hence this video. Its funny the cheat sheet is from echo because its the brand I wanted to take on when I had my own shop unless it was a chainsaw where I would go with the stihl. My boss just killled his favorite ms660 so I will print down (in color of course) the sheet and compare to see the cause. I think it ran too lean or too hot or both because the plastic was untouchable above the head and the exhaust side was scored. As far as the oil in my opinion....I'll stay with 36 to 1 all day everyday and unplug those arrestors with the torch verses torching a motor any day! I dont care how good that oil is 50 to1 is just asking for trouble-rediculous. Keep on videoing!!!
awesome, seen the arrow and knew I could not go any further until I found out why. thank you
Glad I could help!
Your stuff is great Steve....especially the Magic washing machine......
One point you didnt fully make on 'cold seizure' in a chainsaw is that the piston expands faster than the heavier cyllinder, especially the exhaust side of the piston...you either left out the cyllinder's role in the warmup, or I didnt hear right....
great vid....so far all my chainsaw compression losses have been leaky seals and carb/air leaks....frying the exhaust side.
Wow! Thank you for giving me (and us) such great info. My step jerk was a logger when I was a child. He taught me the basics of felling, but not the basics of chainsaw mechanics ( I don't believe he new them), so the mechanics have been a mystery to me. Until I discovered you on RUclips! Because of this, and other, videos of yours, I was able to tear down my wife's old husky 40. (way easier than I ever imagined) It had stopped working due to a clogged fuel filter. Fixed the filter, but then it soon started having problems. Thanks to this video I tore it down and found the piston to be worn in the exact way that your video showed when starved of fuel. I am planning to replace the cylinder head and piston. I will look to see if you have a basic "things to replace when rebuilding chainsaws" video. Ps. I loved the "magic Sink". Gives pause to examine our male privilege. Keep up the good work and fun!
Thanks to you Steve and Echo for making that diagram sheet.
Our pleasure!
Excellent presentation!! Getting ready to work on an old 1987 Stihl 011 that is hard to start. Just ordered a compression tester you recommended. Watched all your 6 videos on why my saw is hard to start.....I feel very confident after watching your vids that I can tackle this job!! Thank you!!!!
You're Welcome...
Steve's Small Engine Saloon I did all you diagnostic tests, cleaned carb, 120 on compression test, new gas filter, gas line and spark plug. It runs better than it ever had. I used some premixed 50:1 gas. Any recommendations on brand or ratio gas for this stihl 011 AV? I have always mixed my own with alcohol free gas at a ratio of 50:1... ...it still runs and has good compression so I must be doing something right.
Awesome video Steve. I started rebuilding saws and you need to know why the piston is damaged before replacing.
Great point!
I lived and learned some of these!
Thanks for the video. Helped me diagnose sons dirt bike issue. It is between a lean scenario and overheating, which makes sense, because if lean, there's also heat! This helps as I can figure out it was my mistake with the jetting and needle position on his carb. And also a bit of training a 13 year old that always pinning it is fun, but mucho hard on equipment. Live and learn, thanks for helping with the learning part!
Glad it helped
@@StevesSmallEngineSaloon and today I threw in the new piston and ring, and she fired up and all is good! Now I learned a lesson regarding jetting where the test was first and the lesson came after! Lol
Thanks again!
Thanks Steve. I was able to find both pages of that analysis report online and print them out.
Excellent!
Very beneficial! For pistons scored from the muffler's side. Could it be that the carbon residues are causing that if not cleaned from time to time?
Wow! I had no idea there was a piston on my unit. The wife will be so pleased.
is it pis... going up and down... lol
As long as the compression is good. Haha
Excellent video you are a very good teacher thank you for sharing your wisdom and knowledge I'm 77 years old and you are teaching me so I can keep my saws and small engines going till I'm 90 love your videos keep em coming but I'm only going to stick to Molson Ice and Ezra Brooks burbon 😀
Right on John! Thank You...
Some reason I can't see any comments but I'm happy u made this video finally got a weed eater to run after few years sitting up an it locked up once then I got it loose an was thanking about putting a cap of olive in it cause it kinda has a weird smell off it
Most timely for my situation, I'm in the middle of replacing cylinder and piston on a Sthil 310 based on watching your referenced videos.. Any tricks or tips on getting the 4 torx cylinder bolts out? This is the best channel for this kind of information and it is appreciated.
Long shanked torx
Great video Steve. I live in a house at our local VFW. I main the grounds and lake on property so I try and do my own repairs to save the VFW much needed $. This vid will definitely come in handy
That is awesome!
Everything on the money! Nicely said got problems with 2-stroke dirt bike! Too much heat don't buy cheap oil I found out! Very good topic! Rebuilding bottom end to ride this summer! Thank you for all the good tips!
Thank you!
Thank you so much for making that failure analysis sheet known to me!
It's in the "Community" tab on my channel....
Excellent video!
Wray in Ohio
Awesome! Thank you!
👍Good stuff. Lots of throwaways out there too.
Very good information. Simple misses can be detrimental to your machine. Thanks
Thanks for watching!
Excellent Advise Steve, Great Stuff Boet👍👌
Thanks 👍
Very useful info for my weed eater and chainsaw. Thank you, Steve!
You're Welcome...
Good!!! Morning Steve! !! From new Zealand. Beautiful morning here . It's Sunday hehe. Cool Cheers.👍
Yea me too. A beers not such a good idea though, I just got out of bed.
A kid at work filled up two ts420 chop saws with straight gas a few years ago- both seized within a couple of days tops...the company now buys premixed in 55gal drums.
Right on
Fantastic bud, really appreciate your effort mate,, really enjoyed the video 😁👍🇬🇧❤️❤️
Thank you so much 😀
Steve again another awesome video I've watched in the last week. I've been thumbs up and comments all week and I've shared my knowledge from you with people at the store my customers and so on and I've got to tell you you are the chainsaw God. Thanks so much for all your videos.
You're Welcome...
Awesome as always. Clear and concise.
Much appreciated!
I think you covered most everything. Cheers!
More videos like this please. Very informative
You got it!
A great video! Everyone should watch this prior to operating or owning small engines! Thanks Steve!
Thank You...and You're Welcome...
You put out some very good informative videos, and have helped me on several occasions. Thank you!!
You are so welcome!
Very informative. It missed exhaust side scoring caused by carbon build up in the exhaust port. This can be caused by running far too rich, or rubbish 2 stroke oil, or mixing the oil too rich, or on weed eaters not opening the throttle to give it a good blow through every time you use it.
Something to add is shake it up! Fuel mix that separates is a common cause for a seldom user of random equipment. Thanks Steve
You're Welcome...
Steve's big beer repair. Good info.
Thank You...
A wealth of usefull information in this video, thanks Steve
Glad it was helpful!
Great video by Steve once again. Nothing dry about this. Informative and interesting as always.
Glad you enjoyed it
Just saw the comment below on where to find the Failure Analysis report. Thanks
Right on...
Thank you so much, Steve. I have been operating 'in a vacuum' trying to understand why my rebuild Stihl FS85 seized. I knew it overheated but I was ignorant of the many causes. I failed because I didn't examine the Critical Evidence. 08AUG2018
You're Welcome...
Great job Steve!
Thank You...
Perfect. Great job. I've been working on the same backpack. Just driving me BS crazy. I'm saving this video so I can show my buddy how he killed his backpack
Right on...
Super helpful. My saw looks like it was run under a heavy load with a dull chain or the fins were dirty. It is an Stihl 026 Pro It was a freebie so I was glad to get it. I replaced the piston and cylinder and it runs like a top.
Right on...
Just read your comment you posted 8 months ago. I also have an 026 pro, owned it for over 20 years, really good powerful little work horse saw! definitely got a keeper there. You stole it! Just keep it clean and sharp!
Fuel restriction , lean running, .... don't underestimate the fuel filter, even if you just replaced it. Some of the fuel filters I've been using , specifically 38-9227 from Rotary(503443201 substitute) had loose plastic flashing material and flopping around inside the filter, blocking the filter outlet, causing a "check valve effect". That would certainly cause a lean condition.
Enjoy your video's, BEERS TO YA!!!
Thank you kindly
Good job! Maybe do something about chipped or cracked piston failures.
Also note on the overheating ones,whatever the cause....the wrist pin is discolored.. blued as well. More proof of correct diagnosis.
Wow! Don't know how I missed this first time around. Popped up in my feed, and I thought you changed your branding. 😇 The only thing I would add is a 4-corner seize. As the name implies, four long, skinny marks on each side of the gudgeon pin caused uneven piston expansion. I think it's more common in the 2-wheel, go faster world: Basically a cold seizure caused by not warming up before going WOT. It is often caused by poor clearance/tolerances on mismatched iron cylinder re-bores for one-over sized pistons, and crank/con-rod upgrades. I think it's less common in the lawn/garden equipment world as piston replacements are so often sold a a complete top end kit. Great video! 👍
Right on Stella Love! You might like this video also on 4 corner seizing! ruclips.net/video/8Q3J1cVGByQ/видео.html
Great information, I have a Stihl MS261 C-M which I am told by the workshop that it has overheated, it is just 2 months out of warranty, I can assure you that the fuel/oil mixture is correct as I am very particular about this. Currently they are waiting for an answer back from Stihl, but I guess they will blame me not anything to do with the saw. Stihl website states that as it is a commercial saw, they expect that it should last for 5 1/2 years, I am only using it for domestic firewood, and it has hardly been used, I have been trying to find out if anyone else has had a similar problem, could it be a fault with the saw. Fortunately in Australia our consumer rights are very strong, but I hope that I don't have to go down this path. If anyone knows of this happening to others would appreciate some information to follow up on. I did everything by the book, maybe as you pointed out, could have been an air leak, will be interesting to see what they come back with, but you video gave me an insight into what could have cause the problem, and something to argue on.
Love, love, LOVE you Small Engine Steve!! You're the ONLY MAN i seek advice from for my 2 and 4 strokes!! A girl can't trust just anybody with her power tools!! Thanks for all the information you share with us! I appreciate your knowledge! Always learning something new from you !! SALUTE!!!
Awesome Kara! Thank You...
excellent. Reminds me of my dirt bike days air cooled two stroke failures. Used Bel-ray MC1 or klotz race oil.
James is right on! Specifically designed for high reving,air cooled engines.
On our outboard racing engines, we always check to make sure the plugs are a chocolate brown.
Great video. I just pulled my saw apart, classic lean seizure. It's a real struggle to keep a saw from two-stroking when milling, so you lean it out... In my case a bit too much
Absolutely brilliant !
Many thanks......all the way from London.
Thank You...and You're Welcome...
Very good video always wondered why. That helped clear up a lot of my why questions.
Thank You...
Very educational..love it
Thank You...
That cheat sheet is really cool
It's in the "Community" tab on my channel....
I read an Echo sheet on ethanol gas and it was informative explaining the new gas cans and the funky spouts that everyone hates.
@@heavymechanic2 Where would that one be available?
@@karlrovey Check the Echo website, this was from a year ago
@@karlrovey The location of the sheet, its a little basic but still good info. www.echo-usa.com/Warranty/Learn-About-Ethanol/Ethanol-Fuel-062512.PDF
Very well explained Steve, cheers to that! As usual you always nail it
Glad to help
Thank you for this video! Saved a huge amount of time for diagnoses on a blower.
You're Welcome...
Same problem i have...
My dad use to put Castrol gtx magnatec in fuel sometimes and it didn’t half clean the rubbish out
Omg your video hits mine on the snail
Thank you, thank you! Great instructional video, Steve!
You're Welcome...
Thanks for sharing all important info, very enjoyable to watch & understand.
Our pleasure!
my new go to guy...right on man.
Thank You...
Good job steve
Thank You...