Info Needed .. front end swap

Discussion in 'Airheads' started by walkingbear, Apr 17, 2013.

  1. walkingbear

    walkingbear Lets Play Chicken!

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    I know the K100 front end would fit on a R100GS. Will it fit on a R90?
    #1
  2. ericrat

    ericrat Long timer

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    My understanding is, essentially, yes. It is a "straightforward" swap. If you check a site like http://www.allballsracing.com you will find the K75/K100 and the Airhead Rs use the same bearing kit.

    Steering stops, gauge mounting, turn signals, etc all need attention.

    Eric
    #2
  3. KhaoSanMan

    KhaoSanMan Airhead

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    Apr 26, 2009
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    Chico, CA
    I have a K100 front end on the shelf and it would be easy to measure if you need any specifics. PM me if needed.
    #3
  4. gsd4me

    gsd4me 90% bluff

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    [​IMG]
    #4
  5. super-single

    super-single Been here awhile

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    Real nice !
    #5
  6. chasbmw

    chasbmw Long timer

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    That's really nice, it's just fitting the spoked wheel that's the issue?
    #6
  7. Plaka

    Plaka Brevis illi vita est

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    Fitting the blower, the fuel injection and paying for the shocks was the issue. Somebody could have bought a stone stock Ducati for what that thing cost---and the Duck would run the pants off it.

    The K uses a bigger axle, so the wheel has to be able to take that---or the axle modified, which sort of misses part of the point of having the K front end---stiffness.
    #7
  8. gsd4me

    gsd4me 90% bluff

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    I'm pretty sure the Ducati would not still be running almost untouched after over 20 years and 275,000 kilometres. :deal
    #8
  9. Plaka

    Plaka Brevis illi vita est

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    170877 miles on a 90S? First over pistons and a bore job at around 120,000mi. Valve job a little sooner. Transmission work and new rear splines a little later, a clutch or two (three on that thing) in there somewhere. But if you took care of the wheel, head and swing arm bearings they're still going strong but you've replaced there discs---and more than a few rear spokes I'll bet. Ya gotta pay to play and beemers will go a million miles and more, but you replace a lot of stuff along the way. granted you might replace more stuff sooner on the Duck, but it's makeing more power.
    #9