R1100GS - gearbox problem - 2nd gear on deceleration

Discussion in 'GS Boxers' started by switch, Jun 7, 2010.

  1. CHANGELING

    CHANGELING Adventurer

    Joined:
    Aug 15, 2006
    Oddometer:
    301
    Location:
    Hungary Central Europe
    When I rebuilt my M97 I replaced all bearings.FAG bearings do work out cheaper but there is one bearing from the output shaft front if I remember well which is a BMW only !! Prepare to bend over and be shafted.

    http://www.advrider.com/forums/showthread.php?t=287650

    Is my thread from years ago with bearing numbers. The good news is that if you get the shimming spot on it will shift like never before.
    #21
  2. switch

    switch Romanian Trailbiker

    Joined:
    May 7, 2009
    Oddometer:
    678
    Location:
    Eastern Europe
    Thanks for the tip. I followed it and...


    ...the conclusion: I got my bike running again.


    I took an M94 box with spotless gears and shafts but a broken frame mount. I bought new bearings for all but the big BMW bearing. That was well within service limits so I decided to keep it. Part numbers, for M94 shafts in an M97 case: 2x 6205, 1x 6204, 1x 6304, 1x 6303.

    So right now my bike's got an M94 tranny, rebuilt to spec. It shifts ok (pretty much like before except it now finds all gears and stays there), no improvement. No more skipping or clanking in 2nd gear.

    For anyone interested, I've got M97 shafts with good gears - if anyone needs them gimme a holler and we can work things out. All damage was on the 2nd gear fixed cog and the 4th gear mobile cog. Shift forks and selector are toasted.
    #22
  3. Tbone

    Tbone off-ramp slayer

    Joined:
    Dec 29, 2003
    Oddometer:
    4,373
    Location:
    Tampa
    You guys that tear into these transmissions are my heroes..
    #23
  4. CHANGELING

    CHANGELING Adventurer

    Joined:
    Aug 15, 2006
    Oddometer:
    301
    Location:
    Hungary Central Europe
    Excellent news. Sweet riding your bike.
    #24