CYLINDER HEADS WITH EXCHANGEABLE COMBUSTION CHAMBERS

VHM produces exchangeable cylinder heads for two-stroke engines in motocross and road racing.  With the help of vast experience in two-stroke tuning, VHM develops products of the highest quality.

During intensive testing, both on the racetrack and on the test bench, the VHM head showed better temperature development in the cylinder head, ultimately resulting in a lower overall engine temperature. The explanation of this phenomenon lies in the use of a special aluminum alloy which has very good heat transference.   Another advantage of the material is its resistance to detonation.

The combustion chamber is very easy to change, simply unbolt the cylinder head, the combustion chamber slips out; you slip another in and reassemble. This makes it very easy to adjust the combustion ratio to different circuits and fuels that are used.

While many standard inserts are available, VHM will produce inserts of your special design or you can purchase blank inserts and cut them yourself.  Combustion chambers are available for both leaded and unleaded fuel.

A “HEADSET” sells for $280.75 and consists of a cylinder head, combustion chamber (insert) and the necessary O-seals. 

(V = Volume, PH = Piston Height, S=Squish)

PISTON HEIGHT INSTRUCTION MANUAL

Piston Height Measuring Tool