*NEW* 2005-2018 Yamaha YZ125 VHM Performance Upgrade Kit

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  • Regular price $1,765.97


Yamaha YZ125 Full Performance Kit

Increase Overall Performance and Power Delivery of your Yamaha YZ125 with the VHM Kit.

Kit Includes:

-VHM High Inertia Crankshaft with a +3mm conrod

-VHM 53.95mm 12 Degree Flat Top Piston 

-VHM Cylinder Head with Special Insert for use with 12 Degree Piston

*Important note
When using our VHM piston, use a small end bearing of 20mm width (ProX 21.3206 or Vertex 8-WB111.

*These kits are made to order, please allow 1 week to ship

VHM Cylinder Head with Special Insert for 12 Degree Piston

The world famous golden VHM head with exchangeable combustion chamber is specially developed for optimal power output during the whole race and has an improved water duct. It's manufactured from a high quality alloy and O-rings are used for the sealing.

Use insert AE32100-

  • More engine power
  • Better heat transference
  • More resistance to detonation
  • Exchangeable combustion chambers available

This insert with 11.00cc volume is the VHM standard for Yamaha YZ125 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 AA33077

  • Best overall performance
  • Quick to adjust
  • Good resistance to detonation
Part number AE32100-C
Type VHM standard
Volume [cc] 11.00
Piston height [mm] 0.00
Squish [mm] 0.90
Piston crown shape Flat top 12°
Bore Ø54

VHM High Inertia Crankshaft with a +3mm conrod

This VHM crankshaft is designed with a +3mm longer conrod. It also has a much higher inertia for an improved handling and performance and a better balance percentage for less vibrations. You'll notice the high quality, as the runout is within 0.01mm and it can be rebuild many times without losing the strength and stiffness.

  • Better mid and top over revolutions
  • Better handling
  • Higher corner speed
  • Longevity and accuracy
  • Less vibration

Must be used in combination with a special piston for +3mm longer conrod and 20mm wide small end bearing.

Link: Crankshaft high inertia 3mm-conrod

VHM 53.95mm 12 Degree Flat Top Piston 

This +3mm conrod piston is specially developed for a maximum performance gain. It must be used in combination with a +3mm longer conrod. This piston is 100% CNC machined from high quality material and has a non-circular profile. They stand for high performance, longevity and keeping high performance during it's lifetime.

  • High performance
  • Inside coating and special Z-clips
  • Longevity
  • Keeps high performance during lifetime

This piston needs a clearance of 0.05mm! Must be used in combination with a +3mm longer conrod and 20mm small end bearing.

Link: Piston kit