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 ports are built in, allow for the correct pressure, flow, and function of a oil cooler!
Made from the best components available on the market, Koso's 170cc big bore kit will amaze you!
NOT AVAILABLE FOR SALE OR USE IN CALIFORNIA.
Optional parts for higher performance:
- Large Bore or bore out throttle bodies
- Aftermarket exhaust system
- Chimera Short Ram Intake System
Professional installation is highly recommended!
Engine break-in, aftermarket fuel controller and special tune/autotune is required! Likewise with any major engine modification or bore up kits, it's now considered a high-performance race engine, extra attention and steps are needed to maintain a high-performance engine.
Disclaimer: NO WARRANTY ON RACE ENGINES parts or engine bore up kits. There is no warranty stated or implied due to the unusual stresses placed on these parts and because we have no control over how they are installed and used. Steady Garage will not be held liable for any failure or damage caused directly or indirectly from use of these products or engine. The installation and use of these products or engine shall be conclusive evidence that the user assumes full responsibility for any damage caused directly or indirectly by their use.
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.
This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; does not meet regulations of pollution-controlled roads or highways.