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Thread: new exhaust for the R!

  1. #1
    Join Date
    Apr 2009
    Location
    Parker, CO
    --
    607

    new exhaust for the R!

    wooooo


  2. #2
    Join Date
    Apr 2009
    Location
    Parker, CO
    --
    607
    where does the big O ring seal that came with the springs go? Thanks!

  3. #3
    Join Date
    Apr 2011
    Location
    minnesota
    --
    57
    i dont have any idea, BUT HOLY MAN THAT LOOKS SWEET!!!!
    What year r?

  4. #4
    Join Date
    Apr 2009
    Location
    Parker, CO
    --
    607
    1986 I'll post up a pic when I get it done, for now, I got a before pic:


  5. #5
    Join Date
    Jun 2010
    Location
    House Springs MO
    --
    5,496
    The oring is used on some of the aftermarket cylinders to seal the exhaust flange to the cylinder. Looks like a nice clean original R. Make sure you jet it properly after the pipe. Way back in the day I actually had to lean my bike out a little, when I want from stock to the FMF pipe.

  6. #6
    Join Date
    Jul 2005
    Location
    Ontario, Canada
    --
    457
    Quote Originally Posted by bkm View Post
    The oring is used on some of the aftermarket cylinders to seal the exhaust flange to the cylinder. Looks like a nice clean original R. Make sure you jet it properly after the pipe. Way back in the day I actually had to lean my bike out a little, when I want from stock to the FMF pipe.
    i second this about leaning it out.... alot of people believe you would richen it, not true, some mods do require richer jetting and some require leaner, a pipe is one of the leaner ones!
    that'll wake her up man!!!! ya should get a Boyesen Rad Valve too!!!
    '85 ATC 250R
    FMF Fatty & Power Core
    Boyesen Rad Valve
    38 PWK A/S
    K&N w/PF (next purchase)
    LSR +4 Axcaliber axle
    LSR Duel row bearing carrier
    DuraBlue Anti-fade (to be installed)
    13/36 sprockets
    '85 ATC 250R
    Parts trike (maybe future build?)

  7. #7
    Join Date
    May 2010
    Location
    Ripon, Wisconsin, United States
    --
    861
    Im at 900 feet elevation and I went up 2 on the main and one on the slow jet with pump gas all stock except reeds with the FMF.
    ]1986 ATC 330R
    1985 ATC 250R vintage PSI racing ported motor
    Get your replacement ATC 250R decals and custom Big Bore #'s here http://shop.3wheelerworld.com/catego...=2&pagegroup=1

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