HONDA CRF50 CRF50F XR50 XR50R, Z50, TOP END CYLINDER REBUILD KIT 39mm Cylinder, Piston & Gasket TOP QUALITY OEM REPLACEMENT. Replaces Existing Cylinder Assembly, Just replace and ride again. 2004-2008 Honda CRF50F 2000-2003 Honda XR50R 1969-1978 Honda Z50A Mini Trail 1979-1999 Honda Z50R 1986 Honda Z50RD 1988 Honda ZB50 Honda C50 - Unmatched reliability and performance from high-tech materials. - Manufactured to exacting standards so the engine can be rebuilt with total confidence. - . - Direct oem replacement. - Please see image before ordering to avoid mistakes. - Best value for money. - ORO products are a high quality replacement part and carries our guarantee of your satisfaction. - Easy to install but if unsure please use a professional Cross Reference Numbers Only: CYLINDER 12101-GB2-000 GASKET 12191-GW8-682 12191-GW8-683 GASKET, CYLINDER HEAD 12251-GBJ-003 RING SET, PISTON (STD) 13011-GBZ-702 PISTON (STD) 13101-GBZ-701 PIN, PISTON 13111-GB2-000 CLIP, PISTON PIN 13115-001-000 94601-13000 Part No. 56-K211.KIT.STD