Blue Line GY6 Cylinder Head 57mm | 157QMJ 150cc Engines scooter cc Speed Rating: 58P (93mph)

Speed Rating: 58P (93mph)

Intake Lobe: 26

Part Number: 0300-0044

barring manufacture defects or shipping damage

Maintain factory-standard handling and ride comfort with the Vee Moto VRM-217 Street Tire (120/70-10)

Blue Line GY6 Cylinder Head 57mm | 157QMJ 150cc Engines scooter cc Speed Rating: 58P (93mph)Replace a cracked or worn cylinder head on your 150cc engine with this Blue Line OEM spec 57. 4mm cast aluminum cylinder head. Includes pre installed valve seats and valve guides. Compatible with 157QMJ engine families using GY6 A block engines used in the vast majority of carbureted 150cc Chinese manufactured scooters, ATVs, and go karts. Features OEM spec cast aluminum construction 57. 4mm bore diameter Pre installed valve seats and valve guides