Honda Grom’s big bore kit will give you more power and reliability on the street or track. It includes the cylinder, piston, camshaft, (optional oil cooler & lines and oversize valve kit) and all gaskets.
Honda Grom Big Bore Kit: Unlocking Extra Power for Your Ride
The cylinder is ceramic coated which creates a strong exterior surface and aids in heat dissipation. This helps to make the cylinder stronger, reduces friction (which increases power), allows for tighter tolerances, and runs cooler than standard aluminum cylinders. The 4 valve piston is forged which is a better choice than cast for performance and reliability. The high compression helps with the torque of this kit as well.
This kit is not a drop-in kit and requires machine work for the cases. We highly recommend having a professional install this. It is recommended to use a fuel controller as well to avoid lean conditions and damage. This is for closed-course competition or racing use only. This product may not meet emissions regulations for use on public highways. Consult your local emissions agency before installing this product.