5 speed shift mechanism

Discussion in 'Airheads' started by ME 109, Feb 24, 2013.

  1. Max Headroom

    Max Headroom lost in the '70s

    Joined:
    Feb 19, 2008
    Oddometer:
    521
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    New Zealand
    Hey Jeff, you realise that the crank is now out of warranty?

    Ninety feet or ninety seconds, whichever comes first. It's my special "Golden" warranty for aussies . . . . :lol3


    #21
  2. supershaft

    supershaft because I can

    Joined:
    Sep 9, 2010
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    San Francisco Bay area
    Some people like how the earlier ones shift compared to the later ones. I can't understand why but . . . .
    #22
  3. disston

    disston ShadeTreeExpert

    Joined:
    Mar 22, 2011
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    Silver Spring, Md
    I don't think the shift update is quicker at all. I noticed that it was a longer throw when I put one in. I think the deal with the shift cam that got more pointy is that the roller has less of a tendency to hang up in the middle causing a false neutral. And the improvement of the pawl is supposed to help prevent a broken pawl spring, but apparently doesn't eliminate it completely. I think there is more to it than my simple explanation.

    I don't have that trans in my bike right now but someday it will be back.
    #23
  4. 100RT

    100RT Been here awhile

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    Nov 4, 2009
    Oddometer:
    816
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    N. E. OHIO
    You have the original mechanism thats what my 81 was built with.
    #24
  5. ME 109

    ME 109 Long timer

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    Jun 25, 2009
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    Albury Australia
    Apparently, until mid '81, the old style was factory spec.
    Mine being 9/81 should have the new one.

    Either way, there is the pre 76 neutral switch cam to explain. I did notice that the little weld job had been done to hold one of those cams in place.
    #25
  6. ME 109

    ME 109 Long timer

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    As it turns out that I have the antiquated shift system, I can only surmise that the new mechanism is something to behold.

    I say that because my shifter is as quick as I need it to be. No false neutrals, positive up and down shifts.
    Achieving said affinity with my shifter does come down to almost precise positioning of the shift lever tho'
    #26
  7. 100RT

    100RT Been here awhile

    Joined:
    Nov 4, 2009
    Oddometer:
    816
    Location:
    N. E. OHIO
    My friends 82 R100RT also had the old shift mechanism. I dont know the build date.
    #27
  8. bmwrench

    bmwrench Long timer

    Joined:
    Nov 10, 2006
    Oddometer:
    2,426
    IIRC, BMW began installing the shift kit for the production year 1983. We installed shift kits under warranty in '81-'82 bikes if the customer complained about shifting problems. This is moot as far as the neutral switch is concerned since they used the same neutral switch from 1976.

    It's my opininon that the shift kit was needed because of the lack of flywheel in the '81 and later bikes. I'm not a big fan of the shift kit; it raises lever effort, and I'm lazy.
    #28
  9. spo123

    spo123 Man About Town

    Joined:
    Nov 7, 2006
    Oddometer:
    860
    Location:
    North Shore Mass. USA
    Well, TO ME, from the first pic......I thought the shift "valleys" looked deep.
    Thanks for the responses, as I have also learned.
    I LOVE this place.

    spo
    #29
  10. AntonLargiader

    AntonLargiader Long timer

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    I can see you have the early 3-4 cam, so it takes the old switch.

    I also see what appears to be a 1974 casting date on the shifter frame. I really doubt it sat in inventory until 1981 before being used.
    #30
  11. ME 109

    ME 109 Long timer

    Joined:
    Jun 25, 2009
    Oddometer:
    3,228
    Location:
    Albury Australia
    Well spotted Anton, it does appear to be 74.

    My bike was 12 or 13 years old when I bought it so anything could have happened in that time.
    In the time I've owned it, the tranny has been to a bmw dealer once for what I thought was a bearing spinning in the cover, and twice to the racer/wrencher I mentioned earlier.

    I also doubt the tranny came from a dealer the way it is.

    Thanks all for your input, I've also learned a lot about my tranny in general from you guys.
    #31