This insert has a higher volume / lower compression ratio, meaning better overrevolution characteristics and more top speed. However, keep in mind that this compromises bottom power reaction. The combustion chamber fits the VHM cylinder head perfectly and is easy to change. The last numbers of the part number are engraved on the insert for identification.
Use in combination with VHM head AA33215
Use the insert chart as a general guideline to select the insert depending on the fuel, track and elevation.
- For use see insert chart table
- Quick to adjust
The insert does not fit into an OEM head, only a VHM cylinder head.
