VHM Cylinder Head Insert ref. AE32250-C for TM RACING MX 300 2015-2025

VHM offers this cylinder head insert for TM RACING MX 300 2015-2025. On a two-piece head, the insert (the "dome") forms the combustion chamber. Its volume and shape set the compression and the character of the engine.

Why change the insert?

The benefits:

• Match the compression to your riding and your fuel without replacing the whole head.
• A part machined from solid, to precise dimensions.
• Replace an insert marked or damaged by detonation.

When should you change the insert?

Signs of detonation, leaking O-rings or the wish to change the compression: the insert can be swapped in minutes, with new O-rings.

Specifications and fitting tips

• Manufacturer part numbers: AE32250-C (Version C (27 cc)), AE32250-E (Version E (28 cc)), AE32250-F (Version F (29 cc))

Available in several combustion-chamber volumes: a smaller volume raises compression (more punch, quality fuel essential), a larger one lowers it (smoother engine).

Cross-Mania tip: Fit new O-rings, tighten in a cross pattern to the specified torque and, with a higher-compression insert, use high-octane fuel.

Spare parts and items to plan

• VHM head O-rings : VHM SK33000.VITON · VHM SK33000
• Coolant : TWIN AIR 1 L · MOTUL 1 L

Compatibility

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

Fits:
TM RACING MX 300 2025
TM RACING MX 300 2024
TM RACING MX 300 2023
TM RACING MX 300 2022
TM RACING MX 300 2021
TM RACING MX 300 2020
TM RACING MX 300 2019
TM RACING MX 300 2018
TM RACING MX 300 2017
TM RACING MX 300 2016
TM RACING MX 300 2015