Looks like sticking rings (in their grooves) have caused a bit of compression blow-by on the piston, (common on ms362s) clutch looks okay, what's the condition of the crankshaft stub?
Update... Clutch looks like this.
Yea, It does come off. Quite easily after some wd40. Will take clutch off later and clean it better.Does that red color come off the clutch and springs? Reminds me of brake dust on car rims. A concern I would have is if the previous owner wasn’t super knowledgeable about saws and possibly smoked the clutch. Almost looks like some burnt plastic on the brake cover around the clutch? Could also just be the picture is a little off. I had a guy drop a 271 off and he fried the clutch and blew up the clutch bearings. Needed a new clutch and brake band. Lots of melted plastic.
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I would switch to red armor or Amsoil Dominator and look at that piston again after 10 tanks. I bet it starts to clean up on its own.
The comment about brake dust on the clutch seems pretty close to me. I’ve seen it on some and not on others, so I don’t actually know what causes it. But I wouldn’t worry about it if the clutch works properly
It’s the newer style Stihl saws with the 1 pc cover. Little different than working on the older style where the carb was mounted in the box on the handle. Once you learn the steps and quirks of each model I think they’re easier to work on than the older modelsPlease someone explain, what makes the 261 so hard to work on?
Doing 250s 260s etc in my sleep, almost feel like taking this apart and see for myself