Vehicle Fitment Information
Pistons & Top End
Koso 4V Head Kits for Honda Grom/Monkey
$10.95 - $1,640.95
An ideal engine part to complete KOSO's Big Bore kit. The unique four-valve design increases air flow and performance to provide more power and torque. Features a forged piston, stainless steel 24 mm intake valves, and 20 mm exhaust valves.
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