Tune your bike with the same VHM high performance parts as used by many previous World, European and National champions!
Tune your engine with our VHM upgrade kit parts. Again, a +3mm concept! The connecting rod has a length of 110mm+3mm=113mm which need to be used with our VHM +3mm piston. The head, insert, piston and conrod can be topped with a VHM CDI unit for optimal power!
Important note
When using our VHM piston, use a small end bearing of 20mm width (ProX 21.3206 or Vertex WB111).
Dyno test Yamaha YZ125 2022 with VHM head and insert
Mounting video VHM CDI
Update your old(er) YZ125 to match the new 2022 concept with this VHM upgrade kit! +3mm longer conrod, high inertia crank
Tune your bike with the same VHM high performance parts as used by many previous World, European and National champions!
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.
The VHM crankshaft AK20192-1 is sold out and out of production.
You can use the OEM crankshaft YZ125 2005-2021 and replace with 102+3=105 mm length conrod (Prox 03.2221)
Important note
When using our VHM piston, use a small end bearing of 20mm width (ProX 21.3206 or Vertex WB111).
Upgrade kit parts explained
Dyno sound Yamaha YZ125 2021
Dyno sound Yamaha YZ125 2021 GYTR
Cylinder head mounting
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info@vhm.nl
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