• SSP-G QMB139 50mm PERFORMANCE CYLINDER & HEAD KIT INCLUDES CYLINDER, PISTON, PISTON RINGS, WRIST PIN, CIR CLIPS, COMPLETE CYLINDER HEAD WITH 64mm VALVES, EXHAUST GASKET, INTAKE GASKET, AND CAM CHAIN TENSIONER GASKET WHEN USED IN CONJUNCTION WITH YOUR STOCK CRANKSHAFT THE DISPLACEMENT COMES OUT TO 82Ccc PLEASE NOTE: REPLACES CYLINDER HEADS WITH 64mm VALVES (SHORT VALVE STYLE) PLEASE SEE RELATED ITEMS IF YOU NEED 64mm VALVES UPGRADES TO 82cc CYLINDER BORE: 50mm CYLINDER SLEEVE OUTER DIAMETER: 54.9mm INTAKE VALVE DIAMETER: 23.5mm INTAKE PORT DIAMETER: 20.8mm EXHAUST VALVE DIAMETER: 20.1mm EXHAUST PORT DIAMETER: 18.8mm VALVE LENGTH: 62.3mm (COMPATIBLE WITH 64mm SHORT VALVE STYLE HEADS) DOES NOT COME WITH CAMSHAFT, PLEASE SEE RELATED ITEMS MADE IN TAIWAN

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