Cylinder head assy, GY6-63cc.-Ø44mm.

Performance Cylinder head assy 63cc.

Fit for the GY6 50cc 139QMA/139QMB 4-stroke engines.

Include springs and valves.

• Cylinder Bore Ø: 44mm

• Inlet valve Ø: 18.5mm
• Outlet valve Ø: 16mm