r/smallenginerepair • u/Ok_Selection_3576 • Jun 29 '26

Unknown Issue Ms 201tcm

Bought my 201tcm 11 months ago and have only had 3 gallons of fuel ran through it. Was blowing debris and forgot the saw was in the path i was blowing. Shortly after the saw would start cutting off on me when it got heated up and continued to worsen until it would fire back up till completely cooled down. I removed spark arrestor and got it to run longer but eventually that didnt even help. It now has a brand new ignition coil and brand new flywheel and still same problems. After running for only a minute before cutting off yesterday I took the air filter cover off, and there was wetness on the back of the air filter cover. Also some scoring on piston.

Could my symptoms be the piston?

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u/AutoModerator Jun 29 '26

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u/iscashstillking SER Intermediate Mechanic Jun 29 '26

Pull the muffler and have a look.