As low as $222.00/mo with or . (Pay in 4 interest-free payments)
KOSO 4 Valve Cylinder Head — High-Flow Performance Upgrade Upgrade your Koso 170cc Big Bore kit with the KOSO 4 Valve Cylinder Head. Engineered for increased airflow and combustion efficiency, this 4-valve design delivers noticeable gains in both power and torque for Honda Grom® applications fitted with the Koso big bore kit. Key Features High-flow 4-valve layout for improved intake and exhaust efficiency Forged piston included for enhanced strength and durability Stainless steel valves : 24 mm intake and 20 mm exhaust for reliable performance Specifically designed to fit the Koso 170cc Big Bore kit Optimized combustion chamber for increased torque and throttle response Important Notes Legal: Not legal for use in California on pollution-controlled vehicles; race use only in California — waiver available. Installation: Requires the use of an iridium spark plug. Professional installation recommended to ensure correct tuning and fitment with the Koso 170cc kit. Ideal for riders seeking a reliable performance upgrade for track or off-road competition, the KOSO 4 Valve Cylinder Head pairs seamlessly with Koso big bore components to unlock the engine’s potential.
Not legal for use in California on pollution controlled vehicles, race use only in California - waiver available.
Requires the use of Iridium spark plug
The 4 Valve Head Kit features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust valves. Only fits Koso 170cc big bore kit.
or 
. (Pay in 4 interest-free payments)
