Owned this for a couple years, didn't know squat about saws when I got it. (Still don't honestly) The good news is I got it for a great deal, its pulling 135psi, runs great and has cut a lot of firewood for me. Starts on the 3rd pull, Idles well at all angles, was given a clean bill of health from a local stihl dealer soon after purchase (thanks a lot) I've only ever run 91 octane ethanol free w stihl HP oil at 50:1, god knows about the guy before me. I think I remember him saying he ran 40:1 but not positive about that. Air filter wasn't perfect but not filthy, replaced immediately after I bought the saw. It was also set a little lean when I got it, I retuned, didn't think much of it til I started getting into this on a more serious level. I assume it was too lean/cheap or stale gas/crap oil but again don't know anything for sure. Haven't done any leak tests. Anyway, what would you do? Did i catch it early enough to possibly save the piston or more importantly cylinder looks to me like the scoring is on both intake and exhaust side above and below the piston. Eff.....
Edit looks like pics were downgraded severely I can email originals to anyone interested. Can't really feel the grooves w a fingernail or pen cap but it def ain't right either.
Edit looks like pics were downgraded severely I can email originals to anyone interested. Can't really feel the grooves w a fingernail or pen cap but it def ain't right either.