Exhaust leaks and lean mixture?
Posted: Tue Jul 12, 2016 8:07 am
Still tracking down that overheated and seized piston, and looking at mixture. The engine had an old over-reused copper gasket ring at the exhaust nut and a smallish ( 1/8 x 1/2") hole rusted in the pipe about 8" from the exh nut. How prone are 2-strokes to pull air into the exhaust during the scavenge part of the cycle and lean the mixture out? I keep looking and keep coming up with zilch.