DHM 149cc Big Bore Cylinder kit for 2022+ Honda GROM
About DHM 149cc Big Bore Cylinder kit for 2022+ Honda GROM
After over a year of development, the big bore 149cc kit is ready to go! Kit includes:
- 55mm Forged Piston with RK Ring kit
- 55mm Sleeved cylinder
- Base and head gasket set
- NGK Spark Plug
- Two base gaskets included. Use both copper and paper gaskets for pump fuel, use only the copper gasket if you are running race fuel.
- An NGK CR9E spark plug must be used
- Ring gaps must be set during install, we recommend .011" on the upper ring and .013" on the lower ring
- 91 octane is the bare minimum, and 93 is preferred.
- Set aRacer spark advance timing to -6 across the entire table when using pump fuel. Spark angle can be adjusted during dyno tuning.
- Honda injector 16450-KZY-701 is the recommended injector for this kit.