Piston Rings


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...



Re: Piston Rings

Hi,Dan! You'll be alright when you install the rings.Have you done that before?I always slightly hone my cylinder with a brake hone and WD-40 and check for an inordinate amount of wear before installing a piston,but some guys don't recommend honing or ridge reaming.Be careful getting those rings in there.They probably have to have the ends set over a pin or something.This is why you need the manual.You only get one chance to do it right,so if you're not sure,get qualified help.Pat attention to what ring goes on top and if it has a cheater edge to compensate for a ridge at the top of the cylinder wall.Read instructions carefully.BYE!

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