Roll,

I was getting about 6500 rpm with a 16x6 pro zinger. I would like to find a 25cc, as this one does not have much in the way of compression. Maybe I can swap the cyl's since I have so much work in the crankcase on this one already. I'm gonna look around today, see what else I can find cheap. I saw the Nville guy with the 35.00 shipped powerheads on ebay, but he says some are FL's and some are some other model..I want to make sure I get the same bottom end, since I need a light engine on this project, and for above reasons. Is there a different crankcase on some of thier models, or are they all the same, provided they are the 4 bolt rear cover?