VHM Cylinder Head for HUSQVARNA CR 125, WR 125 1998-2013

The VHM AA33039 cylinder head is designed for HUSQVARNA CR 125, WR 125 from 1998 to 2013. A VHM cylinder head is made up of an aluminium body and an interchangeable insert that forms the combustion chamber. By swapping the insert, you set the engine's compression and character to suit the fuel and the terrain, without modifying the head.

Key features

• Two-piece cylinder head: body and interchangeable combustion chamber insert.
• Compression adjustable by swapping the insert, without removing the cylinder.

Specifications

• Brand: VHM
• Manufacturer part number: AA33039
• Engine: 2-stroke

Who is it for?

• Original head damaged by pinking (detonation), cracked or warped.
• You want to match the compression to the fuel, the terrain or a tuned engine.
• You're after a smoother or snappier engine without changing the cylinder.

Good to know

The insert is chosen to suit your engine and your fuel: a smaller chamber volume raises compression, which may call for a higher-octane fuel. Always check the squish when fitting.

Fitting tips

1. Clean the cylinder mating face without scratching it.
2. Fit new O-rings and grease them lightly so they stay in place.
3. Check the squish (gap between piston and head) with solder wire before riding.
4. Tighten the head in a criss-cross pattern, in several stages, to the recommended torque.
5. Fit a new spark plug and refill the coolant.

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

• Top-end gasket kit : ATHENA M752009500074 · ATHENA M751802262094
• Spark plug : NGK 6801 · NGK 3230
• Coolant : LIQUI MOLY 1 L · TWIN AIR

Frequently asked questions

Can I change the compression later?
Yes: just swap the VHM insert, without removing the cylinder.

Compatibility

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

Fits:
HUSQVARNA CR 125 2013
HUSQVARNA CR 125 2012
HUSQVARNA CR 125 2011
HUSQVARNA CR 125 2010
HUSQVARNA CR 125 2009
HUSQVARNA CR 125 2008
HUSQVARNA CR 125 2007
HUSQVARNA CR 125 2006
HUSQVARNA CR 125 2005
HUSQVARNA CR 125 2004
HUSQVARNA CR 125 2003
HUSQVARNA CR 125 2002
HUSQVARNA CR 125 2001
HUSQVARNA CR 125 2000
HUSQVARNA CR 125 1999
HUSQVARNA CR 125 1998
HUSQVARNA WR 125 2013
HUSQVARNA WR 125 2012
HUSQVARNA WR 125 2011
HUSQVARNA WR 125 2010
HUSQVARNA WR 125 2009
HUSQVARNA WR 125 2008
HUSQVARNA WR 125 2007
HUSQVARNA WR 125 2006
HUSQVARNA WR 125 2005
HUSQVARNA WR 125 2004
HUSQVARNA WR 125 2003
HUSQVARNA WR 125 2002
HUSQVARNA WR 125 2001
HUSQVARNA WR 125 2000
HUSQVARNA WR 125 1999
HUSQVARNA WR 125 1998