3rd Gear Problems 1996 R1100GS

Discussion in 'GS Boxers' started by Ridin'nFishin, Jul 16, 2010.

  1. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    Just bought my first BMW and I love it and I am going to fix it.

    Here I am just a few weeks ago the day I picked it up.

    [​IMG]

    How many people have had the same problems with their GS? I am wanting to see if this is common or not for the 1100 GS.

    I saw this on Anton Largiader’s website: http://www.largiader.com/ and this describes exactly what my bike is doing.




    edit: 2-25-2011
    I hope that others that are newbie's with these old BMW's will find this tread before they do what I did, go into the tranny 2 times before I figured out what the problem was.

    If you have a older BMW, check to see what transmission you have in it. If it is not a M97 start looking for one or be ready to ship the parts to someone to undercut the gears. They skip gears because they are not undercut.

    <!-- / message --><!-- sig -->__________________









    "My bike 'skips' in third gear...
    ...almost like the ignition cuts out momentarily, or some gear is skipping a tooth." You need transmission work. This can happen to any gear, but usually second or third suffers first. People will try to tell you the shock coupling in the transmission is slipping from one position to the next... hogwash. It's not possible. What's happened is that the shift dogs have rounded off and a shift fork is bent. The gear is only engaged by the rounded part of the shift dogs, which let the gear slip off and bear against the fork. That in turn springs the gear back into engagement the next time the dogs line up a fraction of a revolution later. The problem can start with a bent shift fork (from dropping the bike on the shift lever, etc) or with rounded dogs (from too many missed shifts or half-shifts). It can also start from poor initial assembly of the transmission, whereby there was never enough shift dog engagement in a particular gear.
    You can be certain you have this problem if the oil is an iridescent gold color when you drain it. The gold is the surface of the shift fork wearing away; normally there is absolutely no wear on the shift forks regardless of mileage. Thin slivers of metal that you find will be from the edges of the shift dogs.
    Bottom line is, it needs to be repaired. The problem will get worse and you will damage the shift drum. A good rebuild brings M93 and M94 transmissions nearly to M97 spec. Nearly, meaning that the engagement dogs are straight and five out of six bearings are 'clean.' There will still be one open bearing and an M94 will still have O-rings, but neither difference is significant.&#8221;
    #1
  2. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    Maybe some of you could give me some insight on what else I might have to do to my GS or about my current transmission problem.

    I have already changed all the brake lines and bought brake pads, just not installed yey.

    I will be tearing down my bike in the morning and will bring the tranny to a local shop to rebuild for me.

    I don't like my bikes to be down, I want to ride!

    [​IMG]
    #2
  3. Galen

    Galen Been here awhile

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    My 96 GS did this in 2nd gear at 12K in 2000. I had it rebuilt to near M97 specs (BMWNA covered the parts as "good will"), but now it's skipping in 5th gear with only 28K on the bike. Transmission's out and heading to the bench. I'm probably going to attempt to repair it myself this go 'round--when I find some time. But, if I find a good used M97 in the meantime... or a cheap used GS with non-transmission issues (missed a couple local ones a couple months ago)...
    #3
  4. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    Thanks for your input.

    I wonder what else I should change while in there.
    #4
  5. slartidbartfast

    slartidbartfast Love those blue pipes

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    I had a used RT trans in my GS for a while and it did exactly what you describe. I wouldn't suggest you fool with it yourself. Get it to someone who can fix it properly, like Anton.
    #5
  6. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    Thanks,

    I'm going to pull it tomorrow and bring it to a local shop on tuesday. Or do you think it is a specialized thing that I should send it to Anton?
    #6
  7. slartidbartfast

    slartidbartfast Love those blue pipes

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    I think it's a specialized thing. Your local guys MIGHT do a fine job, but why risk it? There are others with good reputation for transmissions but Anton's the first who came to mind. You're adding shipping but the cost might still be lower overall and you'll know it was done right.
    #7
  8. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    I have the parts ordered and I am going to replace the parts myself.

    Here is what it looks like today, transmission on jack.
    [​IMG]

    Here is what the inside looks like. Looks cut and dry simple so I took it farther apart.
    [​IMG]

    The culprit is the 3rd/4th gear shift fork. I can't tell it it is bent or just wore, the wear marks are clearly visible. I ordered parts and will put it back together myself.
    [​IMG]
    #8
  9. slartidbartfast

    slartidbartfast Love those blue pipes

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    Check the engagement dogs on the gears. If they are rounded, it may well happen again soon. I'm sure you don't want to go into the transmission twice unless you have to.
    #9
  10. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    The dogs are in the middle on left and right. The dogs on the right do not look rounded, but they are not as sharp as the ones on the left. It was hard to picture.

    [​IMG]
    #10
  11. switch

    switch Romanian Trailbiker

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    So did you fix it?

    As you noticed, I have a similar problem with 2nd gear. I'm quite curious to see if simply replacing the fork helps.
    #11
  12. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    I'm waiting on parts to come in Monday, then I will put it together.

    I don't know if those dogs are worn to bad on yours ot not, but they are worse than mine. I can barely tell they have any wear at all, so I am going to put it back together.
    #12
  13. Tbone

    Tbone off-ramp slayer

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    Good on you for tearing into it yourself !!!
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  14. Mituk

    Mituk Been here awhile

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    My '96 with 36k miles also does the "skip" in 3rd gear . . . IF I engage 3rd below about 3300 rpm. If I run up to 4800 - 5000 in 2nd, then go to 3rd, it doesn't do it. Not sure why this would matter. So far I've just been very careful with 3rd gear, and spend as little time as possible there.
    But, it's good to know what it will take to fix it. I'll have to pull the transmission this fall and ship it off to Anton. . . . rats . . . .
    #14
  15. GSbiker

    GSbiker new and un-improved

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    +1

    Just take your time and get all the pieces back in the right place. :thumb
    #15
  16. slartidbartfast

    slartidbartfast Love those blue pipes

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    . That's exactly what mine used to do I rode "around" the problem as you described for a year and about 6000 miles but it did slowly get worse and began doing it in second gear as well. The upside was that I learned to let the bike rev and that seemed to cure the pinging problem. I can use 87 octane pump gas most of the time now, whereas when I used to lug it around at low rpm it would rattle like a can of marbles in hot weather, even on premium.
    #16
  17. switch

    switch Romanian Trailbiker

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    If you delay the repair, you'll have to replace more than the fork. The shift drum and sprockets will suffer damage in time. My problems developed over 20k km (~12500miles) from the first symptoms.
    #17
  18. waynegs

    waynegs Been here awhile

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    #18
  19. Mituk

    Mituk Been here awhile

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    "If you delay the repair, you'll have to replace more than the fork. The shift drum and sprockets will suffer damage in time. My problems developed over 20k km (~12500miles) from the first symptoms."

    Thanks for the clue, Switch -- I just shot Anton an email this afternoon asking that same question -- whether it would cause greater damage if I was careful about avoiding situations that cause the skip.

    Not to hijack the thread, but how hard is it to tear everything off to where you can pull the transmission? I do most of my own work, but that looks like it may be a bit more involved than what I usually undertake. If it's all logical piece-by-piece, I'm thinking I might be able to handle it. Lay everything out on a big board, in order as it is taken off . . .
    Let me know what you think!
    #19
  20. GSbiker

    GSbiker new and un-improved

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    The job looks much worse that it is. Just take your time and label the nuts/bolts if you can't remember where they came from. Take pics to refer back to.
    #20