Seller notes

100cc / 81cc CYLINDER HEAD WITH 64mm VALVES INSTALLED FOR MOTORS WITH 50mm CYLINDER BORE * CYLINDER HEAD* 50mm BORE* VALVE LENGTH: 64mm* OVERALL HEIGHT: 59.60mm* INTAKE PORT DIAMETER: 18mm* EXHAUST PORT DIAMETER: 18mm * EXHAUST BOLT HOLE SPACING: 50mm* INTAKE BOLT HOLE SPACING: 45mm *PLEASE BE SURE THAT YOUR OLD PART IS 64mm VALVE LENGTH. IF NOT THIS PART WILL NOT WORK FOR YOUR BIKE* FITS SOME MODELS OF JONWAY, JMSTAR,ROKETA, SUNL, TANK, PEACE, GATORAND MANY OTHERSSHIPS FROM SHELBY, NCJ1...

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