This insert with 11.20cc volume is the VHM standard for Yamaha YZ125 for hard ground tracks 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 identification.

Use in combination with VHM head AA33203

• Best overall performance for hard ground tracks
• Quick to adjust

This insert does not fit into an OEM head, only a VHM cylinder head.