2022 Honda Grom Piston / BBK

DH Motoring Stock Bore Racing Piston (2022+ Grom / Monkey)DHM has now produced the first high compression stock bore piston and 149cc Big Bore Kit for the new 2022 Grom/Monkey. DHM took development experience from the previous generation Grom and CRF110 to apply 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.DHM Stock bore 125cc kit increases compression to 13.2:1DHM 55mm / 149cc Big Bore Kit 12.5:1 (Use OEM and supplied BBK Gasket)