Koso 61mm Big Bore Cylinder Kit Grom 125 - 170cc

Koso Big Bore Cylinder Kit Grom 125 - 170cc & 61mm Includes ceramic coated cylinder, 61mm forged piston, rings, pin, gasket kit and banjo bolts Compression ratio of 11.5 to 1NOTICE: This product is NOT legal for sale, installation, or use on a pollution-controlled vehicle in the state of California. This product is NOT CARB legal. Legal only for racing vehicles in closed course competitions which will never be driven on a public right of way. Not for sale in California. ANY ORDERS FROM CA RESIDENCE WILL BE CANCELLED AND REFUNDED. Emissions Compliance Declaration: QUALIFIED MANUFACTURER DECLARED "MODIFIED PART" Want to unleash all the power your Honda Grom can handle? Koso's 170cc Big Bore Kit is the perfect addition for you! The kit includes a ceramic coated cylinder, 61mm forged piston, rings, pin, gasket kit and banjo bolts. Unlike many smaller displacement kits on the market that reuses bore out OEM cylinder, Koso BBK is made entirely from their own cylinder casting! Oil cooler