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
24mm intake and exhaust ports with M6 threads
Fits 157QMJ and 152QMI 125cc/150cc GY6-A engines
Does not include studs or bolts — see SKU 155-1 bolt set
Valve cover gasket (SKU 1100-1224) and cylinder head gasket (SKU 1100-1226) sold separately
Specifications
SKU: 1100-1225
Overall Height: 60mm
Bore Diameter: 57mm (57.4mm)
Intake Port Diameter: 24mm
Exhaust Port Diameter: 24mm
Port Threads: M6
Valve Seats: Pre-installed
Valve Guides: Included
Country of Origin: China
Compatible Engine Codes
Fits 157QMJ-based 150cc engines with the following codes:
GY6 157QMJ Engine Codes
157QMJ
JJ157QMJ
1P57QMJ
BN157QMJ
Other QMJ models
Don’t see your engine code? If your engine is a GY6 150cc with a 57mm bore, this head is likely compatible.
California Prop 65 Warning: www.p65warnings.ca.gov
