DHM High Compression Stock Bore Piston for 2022+ Honda Grom/ Monkey
About DHM High Compression Stock Bore Piston for 2022+ Honda Grom/ Monkey
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
- Valve reliefs that clear valves up to 27/22 cylinder head valves
- Includes a new base gasket and head gasket
- Includes a NGK CR9E spark plug that is required
- Requires at least 91 octane fuel
- Requires ECU Flash or other Engine Management.