DOMA Expansion Chamber for HUSQVARNA TC, TE 250, 300, KTM EXC, SX 250, 300 and GAS GAS EC, MC 250, 300 2023-2025

DOMA offers this expansion chamber for HUSQVARNA TC, TE 250, 300, KTM EXC, SX 250, 300 and GAS GAS EC, MC 250, 300 2023-2025. On a 2-stroke, the pressure wave reflected by the pipe helps fill the cylinder: the shape of the cones decides whether the engine pulls low down, in the midrange or at the top end.

Why change the expansion chamber?

The benefits:

• Replace a dented pipe: even a small dent changes the power curve.
• Choose an engine character to suit your riding.
• A clean new pipe, with no leaks at the welds or joints.

When should you replace the expansion chamber?

Dented or cracked pipe, broken mounting brackets or mixture leaking at the joints: replace it, the loss of power is often obvious.

Specifications and fitting tips

• Manufacturer part number: 100434

Cross-Mania tip: Fit new gaskets and springs and check that it touches neither the frame nor the radiator.

Spare parts and items to plan

• Exhaust gasket : ATHENA M753004400094 · ATHENA S410155012002
• Spark plug : NGK 3035 · NGK 2305

Compatibility

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

Fits:
GAS GAS EC 250 2025
GAS GAS EC 250 2024
GAS GAS EC 300 2025
GAS GAS EC 300 2024
GAS GAS MC 250 2025
GAS GAS MC 250 2024
HUSQVARNA TC 250 2025
HUSQVARNA TC 250 2024
HUSQVARNA TC 250 2023
HUSQVARNA TC 300 2025
HUSQVARNA TC 300 2024
HUSQVARNA TC 300 2023
HUSQVARNA TE 250 2025
HUSQVARNA TE 250 2024
HUSQVARNA TE 300 2025
HUSQVARNA TE 300 2024
KTM EXC 250 2025
KTM EXC 250 2024
KTM EXC 300 2025
KTM EXC 300 2024
KTM SX 250 2025
KTM SX 250 2024
KTM SX 250 2023
KTM SX 300 2025
KTM SX 300 2024
KTM SX 300 2023