Scoring on exoust side can be carbon issue, but mostly when I see it here they run hot/overheat.
Overheated saws is usually run lean or has a air leak if they were properly adjusted at time of scoring.
Something as easy as a bad fuel line with a tiny hole in it can do the trick. Crank seals is...
Can't find it. Now that I think of it I am not sure what mfg the parts had I got.
I ask next time I call were they get them.
If you search there is hits on it in Gurgle..
Not necessarily. I have seen more with sprockets than rim. 3/8 and 1/4 was not available here in rim at one point.
I changed some to Oregon drum and rim.
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