KOSO 4 Valve Big Bore Piston and Rings Only Honda Grom 125 – 170cc & 61mm

KOSO 4 Valve Big Bore Piston and Rings ONLY Honda Grom 125 (Cylinder is NOT included)

Replacement 4 Valve Piston and Rings for the KOSO 170cc 61mm bore. No cylinder is included. – Honda Grom 125

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 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; may not meet regulations of pollution controlled roads or highways. Not legal for vehicles registered and use in California.