Standard 9:1CR. Perfect for a stock rebuild. These cast type pistons are well known for their low expansion rate. They have a substantial lower price than OEM forged pistons. Note: Each piston includes one wrist pin and two wrist pin clips. Piston rings must be purchased separately. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.