Chung Yang high performance 36mm piston kit. Piston has proper cam and taper for better fit in bore at operating temperatures, resulting in longer life and better ring seal. Improved skirt cutout for increased transfer port flow. Ring is made from nodular iron for durability and longevity. Kit includes piston, ring, piston pin, circlips, pin bearing, and washers. Fits GP290 engines and engines with 36mm big-bore kits or headkits.?