+1Looks as if the cylinder base and crankcase mating surface had an air leak at the base on the left side. Heat failure started on the exhaust side as that is where most of the heat is. Piston top shows good combustion for some of it's life. Curious if cylinder bolts broke on left side or came loose. I'm no expert or detective 4 sure.
Nicely spotted, but I doubt you'd wouldn't notice the saw running lean to that extent.Looks as if the cylinder base and crankcase mating surface had an air leak at the base on the left side. Heat failure started on the exhaust side as that is where most of the heat is. Piston top shows good combustion for some of it's life. Curious if cylinder bolts broke on left side or came loose. I'm no expert or detective 4 sure.
brain dead...………..
This has been fun so far...but here's the story
This 371xp belongs to a gentleman well into his 70s. He cuts firewood for a group of guys who donate it to the less fortunate. The saw was originally given to him by a mutual friend of ours, and when it first came into my possession he wanted it looked over and ported. I gave him a smoking deal on the port work and fixed some other minor issues. I used a 268 pop up piston(meteor) and only worked the exhaust/muffler. He didn't need IMO anything over the top but still this saw easily out cut a stock one. Couple weeks later he brings it back. Piston was all chewed up and I found that one of the crank bearings tossed a cage out and chewed it up. So I tore it down and rebuilt the whole thing back in November. I only charged him for parts. Being he's volunteering his time for charity I figured I could too. Now a couple weeks ago or maybe longer he called me saying the saw was hard to start when cold. But after that would fire right up. I told him I would have to adjust the tune in person. Then he calls me this weekend saying he was cutting with it and it just quit running. Compression felt so so. He brings it in and the first thing I do is inspect the piston, then proceeded with pressure/vac testing. Pasted the pressure/vac test with flying colors. Took the carb apart and it's clean. Checked the high jet settings and it was at most 3/4 turn out. Fuel looked like it had oil in it. Aside from many of the bolts holding this thing together being loose(no surprise its a husky) nothing critical was loose and everything appeared to be good. Oh and one last note he had a 32" on it, chain was fairly sharp.
So does this look like a lean issues from user error? That's what I'm thinking. IMO if you want or like to run ported saws you should be well versed in chainsaw maintenance and tuning. I adjust the tune of my saws every time I cut with them.
Flywheel side case half was replaced. Which is the reason its colored different.I noticed the flywheel side case half appears discolored in the photos (when looking down thru the cylinder mounting area). Due to heat? Think it has anything to do with it? Is that the side with bearing issues?
Lol you think I could remember what I set the high jet at for a customers saw I haven't seen since November? 371 never had limiter caps.What caused lean? 3/4 Hi seems a little lean. What did you have it set at? No limiter cap let it adjust itself?
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