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  1. #1
    Join Date
    Jul 2009
    Location
    Australia
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    1,031

    Default Vintage MX Bike Silencer End Cap

    The silencer of a two stroke MX bike needs to be packed with fibreglass to keep the sound down and the horse power up.
    Back in the early days the silencers were welded shut so making them throw away. But with a little effort we can rebuild them.

    First cut the end off trying to make the cut as straight as possible.

    Ji
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    Grip it and Rip it

  2. #2
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    If there is any packing still inside remove it.
    Wear a face mask and wet the fibres first then place old packing in a sealed plastic bag.
    This old packing will be dead from oil and carbon.

    Ji
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    Grip it and Rip it

  3. #3
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    I went down to my local ali shop and purchased tubes that were as close to the diameters as possible.

    Ji
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    Grip it and Rip it

  4. #4
    Join Date
    Jul 2009
    Location
    Australia
    Posts
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    Default

    Cut the tubes to the right length and turn or sand to fit.
    Bevel all edges for ease of fit.

    Ji
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    Grip it and Rip it

  5. #5
    Join Date
    Jul 2009
    Location
    Australia
    Posts
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    Default

    Cut and shape the seperator plate and fit.

    Ji
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    Grip it and Rip it

  6. #6
    Join Date
    Jul 2009
    Location
    Australia
    Posts
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    Default

    TIG weld up the internal tube.

    Ji
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    Grip it and Rip it

  7. #7
    Join Date
    Jul 2009
    Location
    Australia
    Posts
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    Default

    TIG weld up the external tube.

    Ji
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    Grip it and Rip it

  8. #8
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    Drill and tap threads in the new end cap to fix to silencer body.

    Ji
    Attached Images Attached Images
    Grip it and Rip it

  9. #9
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,892

    Cool

    Thats some nice work. Must be nice to have a local ali shop as i have to order my alum online...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  10. #10
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    Hi Aametalmaster,
    Thanks for the kind words.
    We have three ali shops within 20km.
    They sell 6061 T6 pretty cheap too.

    Ji
    Grip it and Rip it

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