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    VHM Cylinder Head Insert blank for YAMAHA YZ 250 1999-2027
    VHM Cylinder Head Insert blank for YAMAHA YZ 250 1999-2027

    VHM Cylinder Head Insert blank for YAMAHA YZ 250 1999-2027

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    €72.90
    Tax Included
    Bajo pedido, plazo confirmado en 24 horas.

    VHM cylinder head insert for YAMAHA YZ 250 from 1999 to 2027. Each version shows its three key figures: chamber volume, piston height and squish.

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    Bajo pedido, plazo confirmado en 24 horas.

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      The VHM AE32021-A cylinder head insert is designed for YAMAHA YZ 250 from 1999 to 2027. The insert forms the combustion chamber of the VHM head. Its volume sets the engine's compression: a small volume gives more bottom end and mid-range, a larger volume keeps the engine smoother and longer-revving.

      Key features

      • Each version shows its three key figures: chamber volume, piston height and squish.
      • Change the compression without machining the head, to suit the fuel and the terrain.
      • Part number engraved on the insert.
      • Fits VHM cylinder heads only.

      Specifications

      • Brand: VHM
      • Manufacturer part number: AE32021-A
      • Engine: 2-stroke

      When to change the insert?

      • Switch to a different fuel (98 or race fuel with a higher octane rating).
      • Engine knocking (pinking) or running hot: compression too high for the fuel.
      • You want more torque on tight or sandy terrain.

      Change the insert when you change fuel or type of riding, or if the engine pinks. The insert's three dimensions (volume, piston height, squish) must match your engine.

      Fitting tips

      1. The insert is changed with the cylinder head removed.
      2. Check that the actual height of your piston at top dead centre matches the figure given for the insert.
      3. Replace the VHM head O-rings every time you take it apart.
      4. Check the squish with solder wire before riding.
      5. Tighten the head to the recommended torque, in a criss-cross pattern and in several stages, then fit a new spark plug.

      Why VHM?

      Founded in 1995, VHM specialises in racing engine parts for motocross, road racing and karting. The brand started out with cylinder heads featuring interchangeable combustion chambers, which became its speciality, and then developed crankshafts, connecting rods and gasket kits.

      Spare parts and items to plan

      Frequently asked questions

      Will it fit my original cylinder head?
      No: VHM inserts only fit VHM cylinder heads.

      Which version should I choose?
      Choose according to your engine and fuel.

      Compatibility

      Check the exact model and year of your bike in the list below before ordering.

      Fits:
      YAMAHA YZ 250 2027
      YAMAHA YZ 250 2026
      YAMAHA YZ 250 2025
      YAMAHA YZ 250 2024
      YAMAHA YZ 250 2023
      YAMAHA YZ 250 2022
      YAMAHA YZ 250 2021
      YAMAHA YZ 250 2020
      YAMAHA YZ 250 2019
      YAMAHA YZ 250 2018
      YAMAHA YZ 250 2017
      YAMAHA YZ 250 2016
      YAMAHA YZ 250 2015
      YAMAHA YZ 250 2014
      YAMAHA YZ 250 2013
      YAMAHA YZ 250 2012
      YAMAHA YZ 250 2011
      YAMAHA YZ 250 2010
      YAMAHA YZ 250 2009
      YAMAHA YZ 250 2008
      YAMAHA YZ 250 2007
      YAMAHA YZ 250 2006
      YAMAHA YZ 250 2005
      YAMAHA YZ 250 2004
      YAMAHA YZ 250 2003
      YAMAHA YZ 250 2002
      YAMAHA YZ 250 2001
      YAMAHA YZ 250 2000
      YAMAHA YZ 250 1999

      VHM
      AE32021-A

      Specific References

      Click on your bike to see all compatible parts.

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      VHM Cylinder Head Insert blank for YAMAHA YZ 250 1999-2027
      VHM Cylinder Head Insert blank for YAMAHA YZ 250 1999-2027
      VHM Cylinder Head Insert blank for YAMAHA YZ 250 1999-2027
      VHM Cylinder Head Insert blank for YAMAHA YZ 250 1999-2027
      €72.90
      Tax Included