At DMG Motorsports, we present the KOSO 4 Valve Cylinder Head, an ideal engine part for completing the KOSO Honda Grom Big Bore kit. Its unique 4-valve design is built to increase airflow and performance for riders seeking more power and torque.

Features:

• Designed for the KOSO Honda Grom Big Bore kit
• Only fits the KOSO 170cc big bore kit
• Includes a forged piston
• Features stainless steel 24 mm intake valves and 20 mm exhaust valves
• Requires the use of an Iridium spark plug
• Not legal for use in California on pollution-controlled vehicles; race use only in California, with waiver available

Fitment