Haha, funny thing. I've been working on one too. Seems that the 650 watercraft pistons work great in mine. As for a base gasket, I called psi and they said it's a 20 thousandths gasket and suggested to cut my own with the right gasket material (which I did and seems to well so far) Other than that, Im not sure it would work on a stock crankcase because part of psi's "genesis kit" was to bore the crankcase and weld the crank. I wish you luck. Finding parts is a pain. I have a couple pictures of mine if you would like to get an idea? I also have carb specs for it (39.5 mm overbored roundslides)