Koso 4-Valve Head Kit
Looking for more power and torque out of your Grom? The Koso 4-Valve Head Kit is designed specifically to complete the Koso Big Bore Kit. This cylinder head features a 4-valve design, allowing for increased air flow and performance. You will also find a forged piston, stainless steel 24 mm intake valves, and 20 mm exhaust valves.
Specifications and Options