Universal Parts GY6 Cylinder and Head Kit 6-Tooth Sprocket The A12 works even better

The A12 works even better when paired with a performance head (larger valves)

"description": "Standard starters often struggle to turn over engines with increased displacement

Silver steel tubing

While it shares the same high-performance design as the factory original (Genuine #C21510010004)

Aluminum 7/8" Handlebar

Universal Parts GY6 Cylinder and Head Kit 6-Tooth Sprocket The A12 works even betterUniversal Parts Cylinder and Head Kit for 150cc GY6 4 stroke engines. Includes cylinder, piston, pin, circlips, rings, head gasket, base gasket and chain tensioner gasket. Please choose from 57. 4mm bore or 61mm bore from the drop down menu. *You may need to modify your engine case to accommodate the larger cylinder. Please Note: 61mm kit does NOT fit 161QMK 200cc engines! Bore: 57. 4mm or 61mm, choose in the drop down menu. Overall Height: 90mm