Blue Line GY6 Cylinder Head 57mm | 157QMJ 150cc Engines moto Complete rear drive assembly for

Complete rear drive assembly for all GY6 125/150cc based transmissions found on many Chinese-produced scooters

and 171cc BBK applications

Note: For off-road use only

it is allowed to expand and retract more uniformly than a single piece disk

Blue Line GY6 Cylinder Head 57mm | 157QMJ 150cc Engines moto Complete rear drive assembly forReplace 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