I got the new piston on the Cady engine, but it does not have piston rings yet. I tested the pressure inside of the engine by using a pressure gauge hocked up to the spark plug hole. When I measered the pressure it was only about 40LBS. per square inch. Can anyone tell me what the normal amount of pressure should be for this 50cc engine. How much more pressure would piston rings give? And also how much more power? The rings are on the way, but I just want to know what they will do...