*Fits 2022\ models

Made from the best components available on the market, our 150cc Big Bore kit is the perfect addition to upgrade your performance! The kit includes a black powder coated cylinder, 54 mm forged piston, rings, pin and gasket kit. Its compression ratio of 11.38 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor.

WARNING

THIS IS AN AFTERMARKET PART BUILT FOR RACING PURPOSES ONLY. KOSO IS NOT RESPONSIBLE FOR ANY DAMAGES CAUSED TO THE PARTS, VEHICLE, OR TO YOURSELF AND OTHERS.  ENGINE PARTS ARE NOT UNDER WARRANTY NOR IS COLLATERAL DAMAGE OR COST OF LABOR, IN CASES OF MALFUNCTION.

 Specifications

• Cylinder displacement: 150 cc
• Cylinder material: Aluminum / Black powder coated
• Piston size: 54 mm
• Piston type: Forged
• Compression ratio: 11.38:1
• Kit includes: piston ring, piston, pin, gasket kit and cylinder
• fits Grom® & Monkey® 2022\