i have a husvarna chainsaw ... i let my buddy use it he mixed 8 oz. oil to a gal. of gas ........ now it wount start at all .fills ruff when u try to start it ........like it gumed up ... pord gas in plug hole ......wont fire .he said it slowed down then quit ......what did it do to it ???????????
Sounds like your buddy seized it up, pull the muffler off and take a look through the exhaust port, any sign of piston damage and it will have to cone apart, possible new cylinder and piston
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Try fixfault.com to fix chainsaws.