Vhm Cyl. Head Nsert Cr500r `89-01 51.00 +6.20 2.50

This insert with 51.00cc volume is the VHM standard for Honda CR500R 1989 - 2001 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 AA33121 Best overall performance Quick to adjust Good resistance to detonation This insert does not fit into an OEM head, only a VHM cylinder head.