This insert has a higher volume / lower compression ratio than our VHM standard insert, 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 to the insert for identification.
Use in combination with VHM head AA33217 and VHM 12° piston APKT06521722 and OEM base gasket 0.70mm + extra base gasket 0.20mm
Use the insert chart as a general guideline to select the insert depending on the fuel, track and elevation.
- More top
- Best for hard ground/enduro
- Quick to adjust
- Good resistance to detonation
Raise cylinder with 0.20mm. This insert does not fit into an OEM head, only a VHM cylinder head.
