I have a polini B cylinder (with only about 25 miles on it, and no, this is not justin cuperblasto's siezed one) and a brand new A piston (ring, wrist pin and all that jazz included.) I'm willing to trade this plus patented cuperteen blast technologies ancient polini porting secrets for a Derbi motor, perferably running, complete and awesome. Prefer local but willing to ship and cater to the rest of the country. Just let me know what you have and offer up. Pics coming soonish.