Well it is a McCulloch 28cc weedwacker engine that I am about to convert for RC use and want to make sure it is ok before I spend the time to do it. It did run prior, but it didn't feel like it had as much power as it should have, at least that is the way I felt it. When I took off the back plate to expose the piston area and turned it over by hand, I heard air seaping by the piston, not sure if this is right or not. Does anyone know what kind of compression I should be getting with this engine? Thanks...