cylinder head assy w/o secondary air system SAS for GY6 150cc 157QMJ GY28521

GY6 150cc complete cylinder head with valves suitable for 157QMJ engine types. This cylinder head does not include secondary air system connection. Can be used as straight forward replacement or replacement with heads that currently have SLS / SAS secondary air system. Can also be used on 125cc scooters having 150cc big bore cylinders fitted.

Note: After installation, please always check the valve clearances.