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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