Smokey 90
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#2
I'd take the exhaust pipe off and soak it in kerosene or naptha for a few days.You'd be surprised how much oily residue these 2 stroke pipes and mufflers accumulate over the years. I'd get a new head pipe gasket if you do and also check for any carbon build up around the exhaust port.I've had to chip out chunks before. Pumps were pretty much set at the factory. If it's running ok,then the pipe is all I'd mess with.