PURCHASE INCLUDES: 1X PISTON. 1X PISTON PIN. 2X CIRCLIPS. 1X PIN BEARING. 1X COMPLETE SET OF RINGS. 1X HEAD GASKET. 2X CYLINDER HEAD O-RINGS REPLACES OEM NUMBER: 5CU-11603-10-00 5MW-11633-00-00 93450-19052-00 93310-218A6-00 5CU-11351-10-00 93210-74316-00 93211-02703-00 PARTS FIT: 2000 - 2013 YAMAHA YZ 250 ( DOES NOT FIT YZ 250F ) Additional Details ------------------------------ Package quantity: 1 Warranty: WARRANTY: This part is covered under a 30 day warranty in case of receiving the part damaged, factory defect, or lost in mail ( does not include if the tracking number shows delivered to the address provided ). Incorrect installation will not be covered by the warranty. Shipping for parts returned for refund is at customers expense. Parts returned will undergo a full inspection before a replacement part is sent or refunded. Please DO NOT alter, modify, remove, change or swap out internal or external parts as they will void the warranty. Please contact us regarding the warranty before sending the part back.