MX | ROADRACE | KARTING | MOPED
Tune your engine with our VHM upgrade kit parts! The combination of a VHM piston with 3mm higher position of the piston pin bore and 3mm longer connecting rod leads to less side load on the piston skirt and frictional losses. The results are high performance, better throttle response, more torque and power. All VHM crankshafts are heat treated for strength and durability and can be overhauled many times without losing its rigidity.
When using our VHM piston, use a small end bearing of 20mm width (ProX 21.3206 or Vertex 8-WB111.