Big Bore Kit 170cc Hon

Unleash all the power your Honda GROM can handle with the Koso 170cc Big Bore kit.
Features:

• Ceramic coated aluminum cylinder
• 61mm bore, 11.5:1 compression ratio forged piston/ring kit (premium fuel required)
• Top end gasket kit and banjo bolts
• Not legal for use in California on pollution controlled vehicles, race use only in California - waiver available