This insert with 11.40cc volume is the VHM standard for Yamaha YZ125 and is developed for the best overall performance. 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 indentification.
Use in combination with VHM head AA33203
Use the insert chart as a general guideline to select the insert depending on the fuel, track and elevation.
When using VHM cylinder head in combination with VHM CDI (CD020422), please use the second insert chart.
- Best overall performance
- For use see insert chart table
- Quick to adjust
This insert does not fit into an OEM head, only a VHM cylinder head.
