• New
    DOMA Expansion Chamber ref. 100309 for YAMAHA YZ 125 2005-2021
    DOMA Expansion Chamber ref. 100309 for YAMAHA YZ 125 2005-2021

    DOMA Expansion Chamber ref. 100309 for YAMAHA YZ 125 2005-2021

    Review (0)
    €466.90
    Tax Included
    Bajo pedido, plazo confirmado en 24 horas.

    DOMA expansion chamber for YAMAHA YZ 125 from 2005 to 2021. Handmade in Calais, France.

    Quantity :
    On order

    Bajo pedido, plazo confirmado en 24 horas.

    Wishlist
    Write your review

      The DOMA 100309 expansion chamber is designed for YAMAHA YZ 125 from 2005 to 2021. 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: 100309
      • 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

      1. Reuse the stock connecting O-rings if they're in good condition (not included), or fit a new exhaust gasket.
      2. Offer up the pipe without forcing it, fit all the mounts, then tighten.
      3. Warm up the engine and check for leaks at the joints.
      4. 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:
      YAMAHA YZ 125 2021
      YAMAHA YZ 125 2020
      YAMAHA YZ 125 2019
      YAMAHA YZ 125 2018
      YAMAHA YZ 125 2017
      YAMAHA YZ 125 2016
      YAMAHA YZ 125 2015
      YAMAHA YZ 125 2014
      YAMAHA YZ 125 2013
      YAMAHA YZ 125 2012
      YAMAHA YZ 125 2011
      YAMAHA YZ 125 2010
      YAMAHA YZ 125 2009
      YAMAHA YZ 125 2008
      YAMAHA YZ 125 2007
      YAMAHA YZ 125 2006
      YAMAHA YZ 125 2005

      DOMA
      100309

      Specific References

      Click on your bike to see all compatible parts.

      Write your review

      No customer reviews for the moment.

      Write your review
      DOMA Expansion Chamber ref. 100309 for YAMAHA YZ 125 2005-2021
      DOMA Expansion Chamber ref. 100309 for YAMAHA YZ 125 2005-2021
      DOMA Expansion Chamber ref. 100309 for YAMAHA YZ 125 2005-2021
      DOMA Expansion Chamber ref. 100309 for YAMAHA YZ 125 2005-2021
      €466.90
      Tax Included