MX | ROADRACE | KARTING | MOPED
The combustion chamber can be adjusted quickly depending on the track and weather conditions, as the inserts are easy to change. The inserts are made of aircraft aluminium for detonation resistance. There are various inserts with different volumes available for each head.
VHM standard insert
The VHM standard insert is developed for the best overall performance.
Besides our VHM standard, we also offer optional inserts with varying compression ratios. With a higher compression ratio, meaning less volume, your engine will have more low and middle range torque. Lowering the compression ratio, which means more volume, will result in better over revolution characteristics. This improves speed on fast tracks.
With a blind insert you are able to machine the inside of the combustion chamber yourself, with your own ideas about the specifications (volume, piston height, squish).
Inserts with a part number ending with an A are blind inserts, for example AE32281-A
Custom inserts to your specifications
Instead of machining your own specifications with a blind insert, it’s also possible to order a custom insert. Hereby we machine the insert according to your requested specifications (volume, piston height, squish, combustion chamber shape). An order form to request a custom insert can be filled and send to your VHM dealer:
You can recognize a custom made insert by the number that’s on the label and which is engraved on the insert. Custom inserts end with a 3 digit number, for example AE32100-043.
Besides the VHM cylinder head inserts we also offer special inserts for certain standard cylinder headcovers. For these special inserts, it’s also possible to order a custom insert according your specifications through this order form to request a custom insert:
MX: GasGas 65cc
Roadrace: Aprilia RS125 APC / APE, RSW125 APC / APE
Moped: Derbi 50cc-70cc, Malossi Minarelli 50-70cc AM6 scooter 7T, 70cc Piaggio and 70cc Polini Minarelli
Karting: Iame 125 screamer, Modena 125, Pavesi 125, TM K9B, K9C, KZ10, KZ10B, KZ10C