We have the ONLY big bore piston kits available for the Ruckus/Metro engine. The price is $ 380 shipped anywhere in the continental U.S, Canada, Europe & Asia extra. Ask for shipping cost .They include the piston wrist pin, circlips, head gasket and all gaskets and seals needed for the engine teardown. YOU need to machine your engine making the final product a 60cc. These pistons are high compression and coated, full racing, forged pistons by WISECO. Available in two versions: 2 valves for the Ruckus and Japanese zoomer and 4 valves for the European zoomer.