This insert with 8.40cc volume is the VHM standard for Yamaha YZ85 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 AA33041
- Best overall performance
- Quick to adjust
- Good resistance to detonation