VHM Cylinder Head Insert blank for KTM EXC 250, SX 250, HUSQVARNA TC 250, TE 250 and HUSABERG TE 250 2007-2016

The VHM AE32129-A cylinder head insert is designed for KTM EXC 250, SX 250, HUSQVARNA TC 250, TE 250 and HUSABERG TE 250 from 2007 to 2016. 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: AE32129-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

• VHM head O-rings : ATHENA M752007300094 · ATHENA M752008300094
• Spark plug : NGK 3520 · NGK 6664
• 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 250 2014
HUSABERG TE 250 2013
HUSABERG TE 250 2012
HUSABERG TE 250 2011
HUSQVARNA TC 250 2016
HUSQVARNA TC 250 2015
HUSQVARNA TC 250 2014
HUSQVARNA TE 250 2016
HUSQVARNA TE 250 2015
HUSQVARNA TE 250 2014
KTM EXC 250 2016
KTM EXC 250 2015
KTM EXC 250 2014
KTM EXC 250 2013
KTM EXC 250 2012
KTM EXC 250 2011
KTM EXC 250 2010
KTM EXC 250 2009
KTM EXC 250 2008
KTM EXC 250 2007
KTM SX 250 2016
KTM SX 250 2015
KTM SX 250 2014
KTM SX 250 2013
KTM SX 250 2012
KTM SX 250 2011
KTM SX 250 2010
KTM SX 250 2009
KTM SX 250 2008
KTM SX 250 2007