R100R mystic cafe build

Discussion in 'Airheads' started by pommie john, Mar 28, 2019.

  1. pommie john

    pommie john Long timer

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    I bought a load of boxes which are supposed to contain a 1992 R100R Mystic. It's missing forks, tank and seat, but most of the rest seems to be there.
    I'm thinking about a cafe/tracker bike. I'm getting too old for clip ons so the street tracker style appeals.

    I've done a youtube video and I'll be doing more as the build progresses.

    So far, I've fitted a set of GSXR forks after a false start with Hyosung GT650 froks which were rubbish, but their triple clamps fit the Suzuki forks quite well.
    47296395_10218240468345339_4324959817132146688_n.jpg

    I've got a nice seat from a Suzuki TR750 race bike and I was going to modify the subframe to fit it, but I think I might build a new subframe simply because the original Mystic subframe seems to be worth a few dollars on ebay.

    I'm not a professional bike builder so I'm sure I'll be making mistakes along the way and I won't be hiding them so others can learn from my errors :)

    #1
    Cogswell, BMW851, Pezz_gs and 7 others like this.
  2. 2WheelTraveler

    2WheelTraveler backinthesaddleagain Supporter

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    Looks like you're off to a good start.
    :lurk
    #2
  3. isheyesheis

    isheyesheis Adventurer

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    Hi John,
    Great video, looking good already.
    I've a question about the Hyosung triple clamps, what is the offset of them, and the fork bore size for the top and bottom?
    Many thanks
    Stuart
    #3
  4. Boxerbreath

    Boxerbreath 2017.5 GS Black Storm

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    Nice start. Did I hear you say 'street tracker'? What's a street tracker?
    #4
  5. Kiwiabbo

    Kiwiabbo Been here awhile

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    It’s a good starting point with the late model boxer. Why not look to make a nice daily rider with it. Kinda like the mystic was but try an ditch some weight. Not exactly sure what a street tracker migh5 be but pretty sure it wouldn’t have a race seat on it. Do like that style of seat though.
    #5
  6. pommie john

    pommie john Long timer

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    A street tracker is a street legal bike on the style of a flat tracker. There’s a thread in old’s Cool for photos of them.
    #6
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  7. pommie john

    pommie john Long timer

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    It will be suitable as a daily ride, and it certainly will be lighter than the original. I’m trying hard to source a suitable tank. One thing I don’t want is for it to look like a million other cafe racers that have the original big BMW tank.
    #7
  8. pommie john

    pommie john Long timer

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    The Hyosung triple clamps are : lower 54mm, upper 51mm, offset 32mm ( as close as I can measure it) , and the distance between forks centres is 210mm ( again as close as I can measure.

    Edit: The Hyosung clamps have very big lock stops which are square lumps of alloy on the lower clamp. I had to cut them off as they hit the frame gussets. I'll have to drill the lower clamp and bolt some kind of lock stop on there.
    #8
  9. Boxerbreath

    Boxerbreath 2017.5 GS Black Storm

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    Gotcha. Thought was a cafe bike but whadaiknow...
    #9
  10. Manrider218

    Manrider218 Been here awhile

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    Looks Like
    [​IMG]
    #10
  11. pommie john

    pommie john Long timer

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    It's a bit of both really. I'm making it up as I go along :)
    #11
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  12. Kiwiabbo

    Kiwiabbo Been here awhile

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    6158EF9E-2F31-4BDD-942B-73144A4BE546.jpeg ECFE33CC-A3B4-4C5A-9710-6F46B26C2E32.jpeg I used a mono tank, but then I also used a mono frame and modified it to take the paralever. The origonal frame was a little bent. Previous owner had a nice person pull out of a drive in front of him. Front wheel was an egg and the forks steering head all tucked in.
    #12
  13. isheyesheis

    isheyesheis Adventurer

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    Thanks for that John, I've got a pair of 50mm W/P extremes for my G/S and i'm looking for suitable triple clamps (on a budget!) with a good amount of offset, they might be a contender with some shims :thumb
    Stuart
    #13
  14. MrBob

    MrBob Long timer Supporter

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    I'm looking for a speedometer for my 94 Mystic, in case you have one you aren't using.
    #14
  15. lemining

    lemining Adventurer

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    I'm looking for speedometer chrome cover if you are throwing your old one out.
    #15
  16. pommie john

    pommie john Long timer

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    I’ll have a look in the boxes but I don’t think it came with a speedo. I’m away for the weekend. Gimme a day or two
    #16
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  17. MrBob

    MrBob Long timer Supporter

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    I'll keep you in mind.
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  18. pommie john

    pommie john Long timer

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    Sorry guys, no speedo or tacho in the boxes.
    #18
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  19. pommie john

    pommie john Long timer

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    OK, the brake calipers are fitted. I got a pair of Brembos from a friend who's dismantling a 900 Monster. I made a plate from 6mm aluminium which spaces the calipers right in the middle of the discs, but then I wondered if 6mm aluminium is strong enough, so I took it to a local guy who has a water jet cutter. These plates cost $30 each made from stainless.
    I had to decide whether to use Suzuki calipers which would bolt straight on, but needed 320mm discs. That would mean having some discs made to order ( very expensive) or run the BMW discs and make a caliper arrangement to fit them ( much cheaper).

    The gold anodising on the calipers has faded and I'm trying to decide what colour to paint them. The original gold is hard to find in a heat resistant paint. IMG_5045.JPG IMG_5047.JPG
    All through this build, I'm open to comments and suggestions of better ways of doing this.
    #19
  20. Alfons

    Alfons Been here awhile

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    Hello John,

    I am glued to the screen watching this thread develop.
    As regards the brake discs, I remember dimly seeing some Ducati 320mm disc fitted onto a BMW four-hole hub: This required drilling some new holes for the bolts, but apparently the inner diameter of the Ducati disc fitted onto the BMW hub.
    P.S. : I managed to find the picture:
    https://forum.2-ventiler.de/vbboard...Kreuzpeichenrad&highlight=Ducati+Bremsscheibe

    Best wishes from Germany

    Alfons
    #20