3rd Gear Problems 1996 R1100GS

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

  1. Kawidad

    Kawidad Long timer

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    If you do a hybrid M94/97 do you have to change other things in the driveline? Isn't it a different driveshaft to accommodate the different/changed M97 hybrid? And, would that lead to differences in the FD or subparts?
    #61
  2. papanovember

    papanovember Been here awhile

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    No...the shafts are the same size/length and the input shaft gear looks/is the same...the M97 gears were manufactured differently, but they are the same ratio and interchangeable shaft wise, at least that's what it looks like to me and what my research has turned up...But I will not have the final results from my rebuild for another month or so...but I will post. I just need to find an alternative, for measuring the end float on the shafts, without buying the BMW shim plate:cry.
    #62
  3. hoss18

    hoss18 Been here awhile

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    I have a hybrid 94/97 gearbox in my R1100GS. It was created by necessity...The rear housing of my M97 gearbox broke at the frame mount and I couldnt find a rear housing from a M97, the only secondhand housing I could find came from a M94. The only difference is the end bearing that sits in the rear housing. On the M97 its a closed bearing and a larger external diameter than the M94 open bearing - however both have the same internal (shaft) diameter. Its been in a year now and shifts great.
    #63
  4. papanovember

    papanovember Been here awhile

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    Hey Hoss18, Glad to hear it is working for you. Did you reshim or just use your old shims after you replaced the case?
    #64
  5. Poway

    Poway SHED (Shit Head)

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    Thank you for info on the BMW technique on shifting. It's made a big difference already. Hopefully I'll get a longer life on my tranny, than the previous owner. 58,000 miles tranny life for an expensive bike, is disgusting!
    #65
  6. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    Got lucky and found a M97 transmission, picked up today with 33xxx miles on it, seems to be in good condition. I drained the oil and it looks ok, very little signs of fork wear.

    I beleive I am going to install it wthout opening it up and checking it out.

    What do you think?

    I do plan on fixing my M94, this will be a temp to ride for a while and I will find out how good it is, if it does not skip in 2nd gear, its good. Fingers crossed.
    #66
  7. slartidbartfast

    slartidbartfast Love those blue pipes

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    Unless you plan on selling the M94, I'd suggest just storing it somewhere dry and riding with the M97 - If it's OK to begin with, it will probably outlast the rest of the bike.
    #67
  8. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    I agree.

    I will get it going and see how the M97 works, if it does not skip or anything else, I will ride it. I did read somewhere the the input shaft on the M97 is a weak link and was told 2nd gear is not undercut.
    #68
  9. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    Got it back together today and took it for a little ride. Everything seems to be in working order, it really shifts good and so far stays in gear. I only road about 20 miles, just enough to check it out. No noises, shifts are clunky and sturdy. I got a good M97. :D
    #69
  10. switch

    switch Romanian Trailbiker

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    How would you compare the M97 to the M94? More noise, less noise? That is, ignoring skipping.
    #70
  11. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    The M94 seems to shift eaiser and smoother, I beleive this is because the gears are not undercut. When shifting the M97 you can feel the the gears go into place and stay there. You have to be more direct when shifting the M97, it feels like you have to feel your way around the gearbox, but when shifting it feels solid. No noise unless you shift to slow then it grinds. It does work better when you have a little pressure on the shifter before pulling the clutch. I can tell the M97 has undercut gears.

    I only rode about 20 miles, but it does feel better over all.
    #71
  12. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    GS is fixed now, M97 is the trick or get yours undercut. Bruno will do it, nice guy, told me exactly was wrong with my bike and what it would take to fix it.
    #72
  13. Dan Cãta

    Dan Cãta Long timer

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    That's why I just got an M97 gearbox for my '96 RT :D Just in case...

    Dan.
    #73
  14. UncleMark

    UncleMark Been here awhile

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    I put in an M97 a couple of weeks ago, and it is great. The only glitch is if I shift weakly, I can hit a false neutral between second and third. I had to swap out a cracked front case on the transmission I got, but I found that pretty easy. I did the best I could to measure the clearances, and ended up using the original shims.
    #74
  15. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    I hope that others that are a newbie 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.
    #75
  16. RAL88

    RAL88 Marineboy

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    This thread has been a great help. I just picked up a '95' R1100GS with 15,000 miles on it. Having heard about the transmission I also found a '99' M97 with 13,000 miles on it.

    I do all my own work on my bikes and rebuilt the transmission on my '96' R1100RT.

    Since the bike has been garaged sinced '98' I will be going through it with a fine tooth comb and this will include a spline lube. Would the recommendation be to change out the old M94 with the M97, Run the M94 until it has a problem and then put in the M97 or swap out the weak input shaft of the M97 with the input shaft of the M94 and then put in the M97.

    Any insight would be most helpful.

    Thanks,
    #76
  17. Grok

    Grok Long timer

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    :lurk
    #77
  18. def

    def Ginger th wonder dog

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    Sorry for the delay in replying....

    Any name brand GL-5. The moly will help reduce the wear on the forks.
    #78
  19. RAL88

    RAL88 Marineboy

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    I put Moly powder in my tranny and final drive. I found a temp drop of about 20 degrees and the shifting is easier. I just picked up Tungsten disulfide which will go in on the next oil change.
    #79
  20. Ridin'nFishin

    Ridin'nFishin Been here awhile

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    I do all my own work also, saves money that way. I started to tear the M97 apart and do the input shaft change like you mentioned. I talked to Bruno and he told me to put the N97 in and run it. I may keep the M94 tranny for a later rebuild, but then I may sell it or part it out. I did put new seals in the M94 on the first go round.

    It is up to you and what you fell like doing and the time frame you have to do the swap. If you have the time, change it out. Changing the input shaft, that is up to you.

    #80