Re: low compression
If your definition of low compression is 60 or less, then no matter what the cause, you will need to remove the head.
Low compression ratio can be caused by a broken ring, broken head gasket, or stuck rings. Piston rings almost never wear in 2 cycle engines.
Usually, when rings stick in their grooves, the piston skirt and cylinder will show damage and aluminum wipe-off. If that is the case or if the ring is broken, the piston will need to be replaced.
If you are only showing 15 or so pounds lower than the other cylinder, then the rings may be stuck due to carbon build-up. A decarb treatment may help.
If you are showing zero pounds compression ratio, then the piston is destroyed and must be replaced.
There are NO replacement pistons available for that engine, standard or oversized, however, some late model Force 40 HP pistons MAY fit. BUT----For all the fuss and bother, if the piston is damaged, unless you are emotionally attached to the engine, sell it for parts
