Upgrade your Honda Grom with the Koso 170cc Big Bore Kit, designed to significantly boost engine power and throttle response. This kit features a high-quality ceramic coated aluminum cylinder for durability and heat dissipation, making it suitable for demanding riding conditions. The 61mm bore combined with an 11.5:1 compression ratio forged piston and ring kit delivers increased horsepower and torque, providing a more exhilarating ride. A top end gasket kit and banjo bolts are included for a comprehensive installation, ensuring proper sealing and performance.
Designed specifically for Honda Grom models from 2013 to 2020, including the MSX125 Grom, MSX125 Grom ABS, and MSX125A Grom ABS, this kit is perfect for riders seeking to maximize their bike’s potential. The kit requires premium fuel for optimal performance and is intended for race use only in California, with a waiver available for legal use. This upgrade transforms the standard Grom into a more responsive and powerful machine, ideal for both street and track enthusiasts looking to customize their ride with reliable and proven components.

Features:

• Ceramic coated aluminum cylinder: Enhances heat resistance and durability

• 61mm bore, 11.5:1 compression ratio forged piston/ring kit: Increases engine power (premium fuel required)

• Top end gasket kit and banjo bolts: Complete installation package for proper sealing and assembly

• Designed for Honda Grom models from 2013 to 2020: Including 2014-2020 Honda MSX125 Grom and ABS variants

Fitment:
2013 Honda MSX125 Grom
2014 Honda MSX125 Grom
2015 Honda MSX125 Grom
2016 Honda MSX125 Grom
2017 Honda MSX125 Grom
2018 Honda MSX125 Grom
2018 Honda MSX125A Grom ABS
2019 Honda MSX125 Grom
2019 Honda MSX125A Grom ABS
2019 Honda Z125 Monkey
2019 Honda Z125A Monkey ABS
2020 Honda MSX125 Grom
2020 Honda MSX125A Grom ABS
2020 Honda Z125 Monkey
2020 Honda Z125A Monkey ABS