VHM Cylinder Head Insert for KTM EXC 125, SX 125, SXS 125, HUSQVARNA TC 125, TE 125 and HUSABERG TE 125 2007-2016

The VHM AE32128-A cylinder head insert is designed for KTM EXC 125, SX 125, SXS 125, HUSQVARNA TC 125, TE 125 and HUSABERG TE 125 from 2007 to 2016. On a VHM cylinder head, the combustion chamber is an interchangeable insert (or dome). Changing the insert changes the chamber volume, and therefore the compression ratio, without modifying the head: you adapt the engine to the fuel, the terrain and your riding.

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: AE32128-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?

Since 1995, VHM has been designing racing engine parts for two-strokes: cylinder heads with interchangeable inserts, combustion chamber inserts, crankshafts and connecting rods. A specialist brand, used to fine-tune an engine's power without transforming it.

Spare parts and items to plan

• VHM head O-rings : see the selection
• Spark plug : NGK 2707 · NGK 3006
• Coolant : LIQUI MOLY 1 L · TWIN AIR

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:
HUSABERG TE 125 2014
HUSABERG TE 125 2013
HUSABERG TE 125 2012
HUSQVARNA TC 125 2015
HUSQVARNA TC 125 2014
HUSQVARNA TE 125 2016
HUSQVARNA TE 125 2015
KTM EXC 125 2016
KTM EXC 125 2015
KTM EXC 125 2014
KTM EXC 125 2013
KTM EXC 125 2012
KTM EXC 125 2011
KTM EXC 125 2010
KTM EXC 125 2009
KTM EXC 125 2008
KTM EXC 125 2007
KTM SX 125 2015
KTM SX 125 2014
KTM SX 125 2013
KTM SX 125 2012
KTM SX 125 2011
KTM SX 125 2010
KTM SX 125 2009
KTM SX 125 2008
KTM SX 125 2007
KTM SXS 125 2008
KTM SXS 125 2007