44 thoughts on “Scored Piston and Cylinder on a Chainsaw

  1. Hey Steve man I've been having so much problems with the Stihl 4mix bad cranks after two years of heavy usage commercially also timing gears breaking and Stihl will not cover this this year alone we had 4 fs90 trimmers with bad cranks and cracked block and we don't have none of these problems with our echo equipment we have trimmers and blowers going on 8 years and still going strong only problems we have with echos are having to put new carbs on them after two years and we use good oil we use echo oil and Stihl oil sometimes husqvarna Xp and 89 octane so Steve what do you think what is going on with Stihl we are here in MIAMI and I've been told that the heat here is so intense and humidity that is causing these problems and I see a ton of them in shops for repairs I love Stihl but they are just not lasting us we've had to stick with echos they just are way more reliable for us.

  2. Hey Steve! Do you have any general approach for handling a seized chainsaw? I have read putting Kroil or PB Blaster in the jug via the spark plug hole or the exhaust port, letting it sit for a day or so. Love to know your thoughts.
    Thanks!!!

  3. Very good explanation just had mine pouland pro taking apart same exact thing of what you are talking about. Can you give me and advice of what to buy next should I get the same brand or other brand what you think about that.

  4. Steve seeing new major brand leaf blowers homeowner version. only have one piston ring, that can't last long, seeing any come in for repair, only MTD models still have two piston rings and the reviews on them aren't so great ether. just scraped my mtd had gulling just like you showed in your video

  5. Steve another GREAT VIDEO. THANKS AGAIN FOR TAKING THE TIME TO MAKE SUCK COMPLETE :clear :easy to understand even for me. Lol. I think you’re the best on all of you tube. SERIOUSLY I DO. HAVE YOU EVER WORKED ON ANY OF THE BRIGGS ALL PLASTIC CARBS YETT. I WOULD LOVE TO SEE A VIDEO ON CLEANING AND REBUILDING THEM. THEY ARE ALL PLASTIC CARBURETORS. THANKS AGAINN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  6. Geat vid. Stay away from Stihl 261. My Stihl 261 broke down crankshaft after only 3 years of cutting firewood. Stihl said it was my fault because I didnt use the Stihl oil and alcylat gasoline! 026 was a much more robust saw and I had one for allmost 20 years and used shell oil and 95 gas mixed 2%. Not happy with the Stihl 261 and Stihl support.Warranty dont count if you dont use Stihls own oil or alcylatgas

  7. You have saved me a ton of money and headaches, and your videos are very entertaining. You also introduced me to Buckin's channel. Thanks Steve! You are a great man!

  8. Hi, I have a Stihl 029 Super with 115-120 PSI compression. It runs and revs high but doesn't seem as strong as once. Can I replace just the rings or should I do entire piston with rings/ Is Meteor from Italy a good brand?  Thanks

  9. Steve! Like the videos. Big help. Pistons look good on my 2 saws. Stihl ms 250 and husqvarna 41. Neither is running right. Going to keep watching your videos. Thanks

  10. I have run a couple of Poulans, (smaller ones)  seemed like they were always kind of hard to start(even new)…  Sell that guy a good used Stihl, you'll have a friend for life….

  11. awesome stuff Rick ,OH i mean Steve , not supposed to mention him ARRRH ! my question steve is , when the piston is scored , does the cylinder always gets damage as well or can it be saved sometimes?

  12. Great job and presentation, but four strokes need compression also if the valve seats are toasted or the cylinder is scored the engine will have low compression and will have low power or won't run. I don't need to tell you just shouting out. Keep the vids comming love them very informative.

  13. Great video! You should be a Vocational school instructor. My Dad HAD a beautiful Jonsered chainsaw he bought in 1976, we ran it until the 90's, until he loaned it out and yes, the borrower ran straight gas through it, ruined it. I loved that old saw. I was pissed! I grew up using it. We don't loan saws out now. Lol!!!

  14. steve i need your help. i just thought i fixed this saw but idk i guess now. the compression maxs out at 135ish holds it. i have spark. the carb is good. the piston and cylinder are new. what the hell is going on!!

  15. Now this is interesting. The first piston that ran without oil is uniformly scratched across the entire 1/2 of the piston – where the rings are seized. In the damaged piston just before the vid ends there are huge vertical scorings – do you know what caused the failure in this last example? It's as though it ingested something or began to tear itself apart and that action caused the deep vertical scoring. The second example is very different from the first.

  16. Question Steve ?
    i am rebuilding a Briggs 250cc snow engine
    15c105-003-f8
    NEW VIRGIN BLOCK <STD New piston , new rings , new rod, new crank
    the Aluminum cylinder looks Shiny , NO CROSS HATCHING
    should i hone it ????
    or just slap together ( reassemble )

  17. Sorry but if a scorn piston is "not worth fixing", you need to buy a BETTER saw. The average cost for a NEW cylinder/piston is like $100…..and Used is like $30, lol.

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