worn rings and or bore. all old worn saws do this, the barrell
expands as the engine warms up and causes low compression
you could probably get by with new piston rings.
Also the carb is connected to the crankcase with a rubber
boot which splitsand allows air in. this causes the engine to
idle very fast. a lot of dismantling is needed to get to the boot.
pumpkin man
March 2007