Yes, I know its a bigger PAW, but if yours has been apart, it might be a good idea to make up a gasket set from some stiff paper, so i copied the picture to give you an idea of where to locate the gaskets. Below the needle valve assembly is an "O" ring, check it present and in good condition, the cranckcase back screws into the crankcase and it has a thin paper ring gasket and the base of the cylinder liner also has a thin paper gasket between it and the crankcase. The smaller non R/C engine only has 2 paper gaskets as shown in the picture