- New
DOMA Expansion Chamber for FANTIC XE 125, XX 125 and YAMAHA YZ 125 2022-2026
€242.90
Tax Included
DOMA expansion chamber for FANTIC XE 125, XX 125 and YAMAHA YZ 125 from 2022 to 2026. Handmade in Calais, France.
The DOMA 100424 expansion chamber is designed for FANTIC XE 125, XX 125 and YAMAHA YZ 125 from 2022 to 2026. On a two-stroke, the expansion chamber isn't just a pipe: its cones send back a pressure wave that fills the cylinder better at the right rpm. Its shape gives the engine its character, and a dented pipe costs power.
Key features
- Handmade in Calais, France.
- 1 mm raw steel, laser-cut parts, pressed and then welded on a jig.
- Developed on the dyno and on the track.
- Works with the stock silencer or a Doma silencer.
Specifications
- Brand: DOMA
- Manufacturer part number: 100424
- Engine: 2-stroke
Who is it for?
- Stock pipe dented or cracked after a crash.
- Looking for more response and more power.
Good to know
Competition use only: this pipe is not road-legal.
Fitting tips
- Reuse the stock connecting O-rings if they're in good condition (not included), or fit a new exhaust gasket.
- Offer up the pipe without forcing it, fit all the mounts, then tighten.
- Warm up the engine and check for leaks at the joints.
- Check the colour of the spark plug after the first few rides.
Why DOMA?
A French workshop based in Calais since 1992, Doma Racing designs and handbuilds two-stroke expansion chambers and silencers. A 125 world title in 2000 with Grant Langston and original equipment at KTM: a brand run by two-stroke enthusiasts.
Spare parts and items to plan
Frequently asked questions
Do I need to change the silencer?
No: the pipe works with the stock silencer or a Doma silencer.
Is it road-legal?
No: for competition use on closed circuits only.
Compatibility
Check the exact model and year of your bike in the list below before ordering.
Fits:
FANTIC XE 125 2025
FANTIC XE 125 2024
FANTIC XE 125 2023
FANTIC XE 125 2022
FANTIC XX 125 2025
FANTIC XX 125 2024
FANTIC XX 125 2023
FANTIC XX 125 2022
YAMAHA YZ 125 2026
YAMAHA YZ 125 2025
YAMAHA YZ 125 2024
YAMAHA YZ 125 2023
YAMAHA YZ 125 2022
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DOMA expansion chamber for FANTIC XE 125, XX 125 and YAMAHA YZ 125 from 2022 to 2026. Handmade in Calais, France.
DOMA Expansion Chamber for FANTIC XE 125, XX 125 and YAMAHA YZ 125 2022-2026
€242.90
Tax Included