Got a demon i'm fighting on a pm850 mac i bought on rip me off bay for $225 that now i have about $575 in it - so now after going through the whole saw tearing it down to the block buffing the carbon off the piston the combustion chamber , reasambly , replacing all rubber mounts oil pump clutch cleaning the sand out of the gas tank replacing the fuel line fuel filter air filter pulse line and the intake boot and rebuilding the carb - neverthless i got bit bad - now i have a great running saw BUT with all i have done i have a very and i mean very small gas leak from around the carb - i have checked the needle and seat and the fuel inlet and the fuel hose does not seem to be leaking .... so any ideas???? it will even leak when it sits in the shop cold