Bringing 74 R90S back to life after sitting 30 years

Discussion in 'Airheads' started by _cy_, Sep 30, 2011.

  1. disston

    disston ShadeTreeExpert

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    A nice combination in the stable. I personally wouldn't have minded any changes to the R90S but I guess it will be better off with minimal changes. And yes everything, pretty much, so far is transferable. I think you are getting more juice, electricity, but you may want more again. Not sure how much a G/S has but I don't think any of the Airheads are really modern in this respect. Still it might be enough for you.
  2. _cy_

    _cy_ Long timer

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    G/S already has a few improvements designed for RTW travel. front forks re-valved, sprung and front brace added. etc. etc. every bearing and seal including motor (pistons balanced to 1/10 gram) and transmission internals has been done.

    shipper just picked G/S this morning... about 7-10 days to me. can't wait!!!

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  3. disston

    disston ShadeTreeExpert

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    Congradulations ! You are a very lucky man.

    Charlie
  4. _cy_

    _cy_ Long timer

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    arrived in Tulsa last Friday in a semi trailer designed specifically for hauling motorcycles ..... battery was almost dead. charged battery, engine fired right up ..

    rode 12 miles without tags, figured I'd better wait until Monday until title is transferred with new tags. pretty happy with the G/S! ... much lighter than R90S.


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  5. WU7X

    WU7X The Old Fart

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    Congrats! It really is a beauty!
  6. _cy_

    _cy_ Long timer

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    first little outing to Pawhuska Ok from Tulsa ... about 120 miles round trip

    just outside of Barnstall, OK .. home town of Clark Gable
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  7. Xcuvator

    Xcuvator Justa Venturer

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    Nice looking bike and weather. Did you spend a week there?
  8. _cy_

    _cy_ Long timer

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    testing Aerostich Roadcrafter for water worthiness. a bit unfair since I scrubbed suit hard with soapy water before dousing with a full stream of water. results after 15min of scrubbing and dousing with water... soaked inside.

    will try water only next time

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  9. Wirespokes

    Wirespokes Beemerholics Anonymous

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    You're supposed to waterproof the suit every now and then. Sounds like it's time! :wink:
  10. Airhead Wrangler

    Airhead Wrangler Adios Mexico

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    No matter how well you waterproof them aerostich + rain = soggy crotch (eventually legs too)
  11. fishkens

    fishkens Long timer

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    +1 The zippers simply aren't waterproof. The suit could be more waterproof but that would compromise the easy entry/exit, although I do believe they're now using more water resistant zippers seen on mountaineering gear.

    From their site:

    Waterproofing Zippers?

    The Roadcrafter’s unique zipper arrangement can become a source of water entry in extremely wet conditions. To dramatically improve performance in severe conditions use either a wash-in water repellent or hand seal these areas: 1) Stitching and knit zipper fabric around both underarm zips; 2.) The knit zipper fabric along the right leg zipper; 3.) The stitching and knit zipper fabric along the left leg zipper from two inches above the bottom of the Velcro flap, to below the knee.
    Wash-in repellents like Nikwax TX Direct® penetrate everywhere during laundering. In addition to improving breathability in wet conditions, they minimize leaks around zippers. Seam sealing products like Seam Grip®, should be thinned enough to completely soak into the fabric, thread, and stitching. (Use Cotol® or toulene.) Apply sealant to both the knit zipper fabric and the stitching.
  12. sdpc2

    sdpc2 Just another Rally Rat

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    Greg is known for having some really nice G/S's over the years.... and i've never even met the man. But i seriously considered buying a bike from him a few years ago...
  13. _cy_

    _cy_ Long timer

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    G/S in front of Frank Loyd Wright Price Tower yesterday
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  14. _cy_

    _cy_ Long timer

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    Leaky Bing carb fix on R80 G/S ... tried everything else without success.
    it was time to replace the seat. removing seat by carefully following below method requires no heat.

    use a 24 - 5/16 tap then screw same pitch bolt into now threaded brass seat.
    use a nut with ID larger than seat for a spacer. then simply turn nut to pull out.

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    easy does it when making initial pull. taking apart several times to inspect pull is coming out straight.

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    use a brass drift to gently tap new seat in

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    correct float height setting. float level with edge of bowl.

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  15. disston

    disston ShadeTreeExpert

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    Thanks Cy,

    That's the first time I've seen this explained so clearly and with pictures. Nice operation.

    It is pretty amazing they can leak I think and not show any deformity. Was that also your experience?
  16. _cy_

    _cy_ Long timer

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    yes... tried everything multiple times ... changed out to new floats, new needle, tried different float heights, new float bowl gasket, etc.

    it'd hold for awhile like overnight, then start leaking again ... it was time for a new seat
  17. Duckmeister

    Duckmeister midlife crisis@64

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    I too am bringing back to life a 74 S model. In the event that you need to resto the guages,I can recommend Terry Vrla in Oregon. He goes by "Wirespokes" on this site. Great job,very fair price. Best of luck with your Beemer...
  18. _cy_

    _cy_ Long timer

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    working electronic ignition yanked on R80 G/S

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    these little lovelies are in it's new home (one spare beancan with points)
    fired right up with static timing ... double check with timing light tomorrow.

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  19. chasbmw

    chasbmw Long timer

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    This looks like a very early 90/s with the solid discs, if it is likely that the calipers are 38MM (if they are not marked with a 40, then they are 38s).
    My dual 38s work very well with a 13mm handlebar master cylinder, so i suggest the smaller the better if you want more poweful and responsive brakes.

    Charles
  20. chasbmw

    chasbmw Long timer

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    with an early R90S like yours it is worth running an earth wire from the front indicators back into one of the earths in the headlamp.