BMW Cafe Racers - post a pic?

Discussion in 'Airheads' started by Nick Makwell, Aug 30, 2006.

  1. Darbone85737

    Darbone85737 Adventurer

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    [​IMG]

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    Here's my soon to be finished BMW RS 90. Based on a 1974 R90S I was trying to bring the RS54 style to a more modern bike. The front forks are KYB 43 mm inverted units with Tokiko dual piston calipers. The upper and lower clamps as well as the lower fork legs are powdercoated in black wrinkle finish. The calipers are in a Ducati gold. I wanted to stay with spoked wheels so the forks are mated to the stock R90S wheels. Machine work for this as well as the top end rebuild was done by Jimmy Nichols who was BMW factory trained when the /2s were new. He has mad machinist skills. It has Magura levers modified to fit the Kawasaki brake master cylinder and the single throttle cable goes into a splitter to run the Dellortos. Exhausts are custom (the paper cones are patterns from which reverse megaphones will be fabricated). The "Fred Flintsone" rear shock spacers are being replaced with Marzocchi shocks from an early Ducati. The drilled airbox and air tubes will remain stock- That space is problematic to deal with and this bike will be ridden here in Arizona so air filtration is required. Front fender is from a Triumph and will probably be bobbed back a bit at the front, The headlight shell is Lucas with a Harley Davidson halogen lighting unit installed. Wiring is kept to a minimum as I've not fit turn signals or horn. Lighting has quick detach fittings for track days. A Scitsu tach unit will be mounted but no speedo. I'll also be installing a steering damper once I get a chance to ride it a bit.

    The project was funded by selling off the Daytona Orange R90S bodywork, guages and other bits to restorers who didn't mind paying what I thought were insane prices for them. Most parts used to build this came from trades, swap meets and boneyards.

    Hope to have it up and on the road in a few weeks and I may take it to Bonneville and run it just to see how it does.
  2. bill42

    bill42 Old-School BMWs

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    Wow man! This is awesome in so many ways. I love the lowered look and serious front end! Lots of unique details on this bike, which looks like it should have performance to match many modern bikes.
    What kind of metal are your headers made from? Is that titanium?

    One thing for sure- since you started with an R90S, that should take the pressure off the rest of us building cafe airheads as far as BMW loyalists complaining about modifying old airheads!
  3. Leadnuts

    Leadnuts do-over...

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    What is that fork setup, they look up side down? nice looking.
  4. richarddacat

    richarddacat Rollin' and Tumblin'

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    The front forks are KYB 43 mm inverted units with Tokiko dual piston calipers.

    :rolleyes Copied from the post, try again :deal
  5. Airhead Wrangler

    Airhead Wrangler Long timer

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    That is pretty cool. My eye wants a bigger headlight, but it's your bike. Nice work.
  6. richarddacat

    richarddacat Rollin' and Tumblin'

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    Did Jimmy Nichols make the triple clamps or what was used?

    Neat build :thumb
  7. Leadnuts

    Leadnuts do-over...

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    Cool.:huh

    Can we get a shot of the cockpit? pleeeease.
  8. guy152

    guy152 Adventurer

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    I like, nice work mate..
  9. bill42

    bill42 Old-School BMWs

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    Just getting started on my cafe project. Bike started off as an R100RT so it has every optional wire possible coming out of the bucket in like 5 or 6 different holes. The bike will be naked with a smaller speedo gauge so it would look terrible like this as I can't hide all these wires.
    I want to keep stock bucket as I like its quirky shape. Thinking best option is to move the entire wire block to under the tank as others have done in the past. My question is, have you done this? Was it hard to figure out? Looking at all these wires is giving me a headache! Any tips would be greatly appreciated.
  10. KhaoSanMan

    KhaoSanMan Airhead

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    I decided to switch harnesses altogether from a 90's R100 to a R65 which went in conjunction with switching the controls to an older style. If you have the room under the tank (which tank will you be using?) it shouldn't be that hard to fab mounts for the relays etc.
  11. bill42

    bill42 Old-School BMWs

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    I am using the stock tank from the 81 R100. I guess an R65 harness will have a few less wires except the Acewell gauge I am using kind of needs all those wires anyway as it has volt meter, directionals, etc...
  12. skrub

    skrub Been here awhile

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  13. bill42

    bill42 Old-School BMWs

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    Do you mean that you will build an entire new wire harness yourself?
    Is that diagram any different than the basic BMW diagram minus some things like directionals and gauges?
    I wish they gave a pdf instead of that lo rez image.
  14. skrub

    skrub Been here awhile

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    This diagram is much simpler than the factory. Half the ln. ft of wire. I'll cut up the stock harness and reuse some of the longer wire and the plugs for the starter relay and volt reg. The diode board, starter relay and volt reg will be mounted where the air box used to be. I printed the Team Incomplete page and took it to Office Max and thay inlarged it, much better.
  15. Kai Ju

    Kai Ju Long timer

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    How long are the forks and how will that affect cornering clearance ?
    Would you mind measuring from top of the upper triple camp to the center of the axle ?


    Nice job on that bike, btw.
  16. richarddacat

    richarddacat Rollin' and Tumblin'

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    GOOD Grief boy and girls, aren't you reading ALL of the posts??? Pay attention!

    Refer your questions to Darbone85737, IT'S HIS BUILD, NOT MINE.
  17. Kai Ju

    Kai Ju Long timer

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    Sorry 'bout that, seems I quoted your copy.

    So all I have to do now is wait for Darbone85737 to get a chuckle out of our exchange and then answer my questions.:D
  18. Toaster.Tan

    Toaster.Tan Toaster Rider

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    How did you adapt the stem of the triple to the BMW head? Did you press a BMW stem into the lower - or some other way? What was affected: bearings, bearing tension adjuster, top nut? Any photos of that would also help.

    ToasterTan
  19. Darbone85737

    Darbone85737 Adventurer

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    Sorry for the delay in responding. I've been back east for a bit and just returned to Tucson this morning.

    I'll get back soon to try and answer questions. Basically the stem was removed from my R90S and used to replace the stem on the KYB trees. The forks came from a 1989 Kawaasaki ZX7R that I got in a deal when I bought my BSA Gold Star. New tapered bearings were fit and new fork stops added to the frame. The hard part was making the BMW spoked wheel mate with the Kawasaki axle and the dual Tokiko discs. Jimmy did all the machine work and it took a lot of skill and time. I doubt he would want to do it again.

    as far as ride height and rake/trail measurements - The ride height is going to need to be determined once the shocks are mounted. The first issue that became apparent was interference of the front fender with the front engine cover. That's been resolved. The shocks are Marzocchi remote reservoir parts that came from an old Ducati and are being rebuilt. They are 12.5 inches eye-to-eye. Jimmy set up the rake and trail for the new forks but I don't have those numbers right at hand. This is still a work in progress and we're making adjustments as we go while we determine what will work and what won't. The first ride should give us a ton of new information but that will probably be a few weeks out

    Thanks for the interest.
  20. Darbone85737

    Darbone85737 Adventurer

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    The headers are plain steel made with bends purchased at a local hot rod shop. They'll be ceramic coated when finished.

    I used to do pre-1970 BMW restorations. After I finished and sold a 1952 R68 I got bored with it and decided to do something different, I LOVE the rivet counters and "loyalists". After selling off the Daytona orange bodywork and other R90S bits I was left with the basis for this project at no expense. I used the R90S motor for the performance aspects and I think this thing will meet all expectations.