- New
VHM Cylinder Head Insert ref. AE32255-A for TM RACING MX 300 2015-2025
€70.78
Tax Included
VHM cylinder head insert for TM RACING MX 300 from 2015 to 2025. Each version shows its three key figures: chamber volume, piston height and squish.
The VHM AE32255-A cylinder head insert is designed for TM RACING MX 300 from 2015 to 2025. 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: AE32255-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
- The insert is changed with the cylinder head removed.
- Check that the actual height of your piston at top dead centre matches the figure given for the insert.
- Replace the VHM head O-rings every time you take it apart.
- Check the squish with solder wire before riding.
- 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
- VHM head O-rings : VHM SK33000.VITON · VHM SK33000
- Coolant : MOTUL 1 L · MOTUL 20 L
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:
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
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VHM cylinder head insert for TM RACING MX 300 from 2015 to 2025. Each version shows its three key figures: chamber volume, piston height and squish.
VHM Cylinder Head Insert ref. AE32255-A for TM RACING MX 300 2015-2025
€70.78
Tax Included