Race Head – Larger valves (now 25/22mm) and better flow for increased performance. Also has bigger cooling fins. Includes all necessary parts and comes assembled! - 52mm piston with rings, pin, & clips. - High performance race camshaft (for the Race Head only) - Head gasket kit. - Intake kit for the race head - will match the race had much much better than intakes intended for the stock head. This kit is for upgrading 88cc bore kits with a stock head to the Race head. You should have your existing cylinder honed (unless its new) prior to installing this kit. We recommend purchasing a high volume oil pump kit (available in this section). Works on the 1988 and newer bikes with an existing 88cc kit.