Koso 170cc 61mm Big Bore Kit - Honda Grom & Monkey (128-6)

Want to unleash all the power your Honda Grom can handle? Koso's 170cc Big Bore Kit (MB623002) is the perfect addition for you! The kit includes a ceramic coated cylinder, 61mm forged piston, rings, pin, gasket kit and banjo bolts. Its compression ratio of 11.5 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor. Made from the best components available on the market, Koso's 170cc big bore kit will amaze you! Also compatible with the Honda Monkey 125cc.

***Please Note: You may need to modify your engine case to accommodate the larger cylinder***

*Please note: Compatible with 2014-2021 Honda Grom

• Cylinder Displacement: 169.2cc
• Cylinder Material: Aluminum/Ceramic CoatedCylinder Overall Height: 90.5mm
• Piston Diameter: 61mm
• Piston Type: Forged
• Compression Ratio: 11.5 to 1