Boosted3g
ArboristSite Lurker
I was losing some compression and had a suspected oil tank leak so today I rebuilt my ms361. I installed a new oem piston and rings and upon inspection of the original piston it is cracked on exhaust side of the pin on both sides. The crack is light and I can't open it up with pressure. The pin was also very tight and took some work to push out. I'm glad I didn't cheap out and replaced everything but if I was just reringing I might have missed this. This was the first this saw had been apart so could hours have caused this? The saw was smoking a bunch before the tear down but the case gasket was in rough shape and it was sucking bar oil. It was run for about a tank in this condition. Saw has only seen motomix for years and only has a muff mod. Has always run, started and idled perfectly. Is there a such thing as spark knock on a 2 stroke that may have beat it up?