Yeah I want to do that once its running. I upjetted the 15 Dellorto to a 57 but it won't start still. My spark is a little whiteish. I can't figure out why this thing doesn't go. I haven't really had time to fiddle with it further. Maybe the spark is too retarded and cool to start the gas/air mix. There is one thing i am worried about. On Derbis, should the piston be arrow to exhaust like everybody else, or is it switched? When I got, a lot of things were backwards and upside downIn the cylinder, and i reversed the piston. Could that be it?