DHM High Compression Stock Bore Piston for the 2022+ Honda Grom / Monkey

**Professional install is highly recommended. Ring gaps must be set, and base gaskets must be installed properly. Setup sheet is included DH Motoring Stock Bore Racing Piston (2022+ Grom / Monkey)We've now produced the first high compression stock bore piston for the new 2022 Grom/Monkey. We took our development experience from the previous generation Grom and CRF110 and applied it to the all new Grom engine and have come up with a lightweight, high compression piston that still utilizes the OEM 12mm pin size.  ~13:1 compression 50mm stock bore piston Larger ring and skirt oiling holes than other pistons on the market Larger oil spring to increase oil volume between the oiling rings OEM sized skirt area to maintain reliability Racing piston ring kit with pins and circlips Includes a base gasket spacer and head gasket (you will reuse your stock base gasket as well) NGK CR9E spark plug required  Requires at least 91 octane fuel Requires ECU Flash or other Engine Management (aRacer, etc)