VHM Gold Performance Cylinder Head for KTM 125 SX, Husqvarna TC 125 & GASGAS MC 125

The VHM AA33156 Gold Performance Cylinder Head is designed for KTM 125 SX, Husqvarna TC 125, and GASGAS MC 125 2-stroke motocross motorcycles, delivering race-focused performance with improved cooling efficiency and interchangeable combustion chamber technology.

Manufactured from a high-quality aluminum alloy, the head is engineered to provide strong and consistent engine performance under demanding motocross conditions. Its improved internal water duct promotes more effective heat transfer, helping maintain stable operating temperatures during extended high-rpm riding and competition use.

The VHM interchangeable combustion chamber system allows the insert to be matched to the piston configuration without replacing the complete cylinder head. For engines using the OEM piston, the recommended standard insert is AE32257-E. For engines equipped with the VHM 12° piston APKT12511725, the corresponding standard insert is AE32257-026.

This modular design also allows riders and engine tuners to select different combustion chamber configurations according to fuel, track conditions, elevation, and desired engine response.

The head uses O-ring sealing for a precise and reliable cylinder head interface. An M6x8 vent screw and BD36006 copper sealing washer are included and pre-installed.

Finished in VHM’s signature gold color, the AA33156 combines improved thermal management, tuning flexibility, and race-ready construction for competitive 125cc 2-stroke applications.

Combustion chamber inserts are not included and must be ordered separately.

Key Features

• Interchangeable combustion chamber system supports both OEM and VHM 12° piston configurations
• Improved internal water duct enhances heat transfer and helps maintain consistent engine temperatures
• High-quality alloy construction provides durability for demanding motocross race conditions
• Designed to improve engine power and increase resistance to detonation
• Includes a pre-installed M6x8 vent screw and BD36006 copper sealing washer

Technical Specifications