My -78 RS

Discussion in 'Airheads' started by BrooklynS, Apr 1, 2014.

  1. BrooklynS

    BrooklynS Adventurer

    Joined:
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    Hi there!

    Just before Christmas I found out that Santa decided to reward me for beeing a good guy; thus a 1978 RS took place in my garage. It hadn't been running for about thirteen years, so I of course had to overhaul it. Right now I am thinking about how to copy the restoring thread at a swedish forum, where I have the whole story and quite a lot of pictures too.

    Tomorrow morning it is time for MOT, so right now I am a little bit nervous... :D

    ImageUploadedByTapatalk1396373115.544173.jpg

    At the moment I have a problem with leaking carburators, especially the left one. Totally rebuild with new parts, thats the funny thing. Maybe some dirt from the tank that blocked the floater needle?

    Since I live in the northern part of Sweden, it is still snow and ice here, but the roads are at least dry.

    I'll get back to you soon.
    #1
  2. BrooklynS

    BrooklynS Adventurer

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    Here we go.

    About a year ago, I started to think about a R100RS to rebuild and to get in good shape for driving and maybe some touring. I like the original style, since I read about this bike when it was presented 1976 (as my father bought the magazines Motorrad and Motociclismo).

    This one I found in the middle of Sweden, it had been stored in a garage (aka barn find) for 13 years without visiting the tarmac so there were a lot to do before it came to running shape. 160.000 km on the tacho so far.

    These are pictures from the pickup moment.

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    Krauser bags, oiltemp and pressure meters are professionally mounted in the fairing. Ohlins shocks also.

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    The plan is to start it up, get at battery, clean the carbs, rebuild the brakes (they are stucked), change oils etc.

    More to come.
    #2
  3. airsmith

    airsmith airhead wrench?

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    I have seen small slices of new fuel line from pushing the line onto the carb fitting.. they bounce around above the float needle seat and never drop through into he bowl.. but will stop the needle from seating.. what final drive does your RS have.. my 78 had the taller one that came with U.S. models (felt like a gear taller)..
    #3
  4. BrooklynS

    BrooklynS Adventurer

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    Well, now it has landed in our man cave.


    [
    All rubber parts has to be changed, that's for sure. Brake hoses, gaskets etc.

    The best moral-lifting is to start it, so we started with cleaning the carbs and change the gas hoses. A quick check of the front brakes also took place.



    The electric system works fine, but the battery was almost dead, so we didn't manage to start it. These bikes need good batteries, that was quite obvious!
    #4
  5. BrooklynS

    BrooklynS Adventurer

    Joined:
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    Well, now it has landed in our man cave.





    [​IMG]

    All rubber parts has to be changed, that's for sure. Brake hoses, gaskets etc.



    The best moral-lifting is to start it, so we started with cleaning the carbs and change the gas hoses. A quick check of the front brakes also took place.






    [​IMG]
    The electric system works fine, but the battery was almost dead, so we didn't manage to start it. These bikes need good batteries, that was quite obvious!
    #5
  6. BrooklynS

    BrooklynS Adventurer

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    Long story short now (since my photo server didn't like the linking)



    I'll try to sum up what's done so far:



    Carbs rebuilded with all new parts.

    Brakes rebuilded with all new parts, new DOT4

    New cables to chokes

    New cables to throttles
    New gas hoses
    New fork oil

    New gel battery

    New screen (which I crushed today... :baldy)

    Rebuilded alternator and diod board
    New fairing gaskets (to fork)

    New tires, Michelin Pilot Activ

    New brake hoses

    New hand warmers (remember where I live...)

    Change oil in gearbox to Red Line

    New oil in shaft and gearhouse

    Fixed the "Piranha" electronic ignition, the cables got stuck in the rotor when tuning the carbs...



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    #6
  7. BrooklynS

    BrooklynS Adventurer

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    I think I have the 1:3,0 - 11/33, but you could also have 11/32 or 1:2,91 on demand. It really feels like starting on second gear...
    #7
  8. BrooklynS

    BrooklynS Adventurer

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    Today it went through the MOT without a problem - legal for the next two years! :D

    [​IMG]
    #8
  9. boxerboy81

    boxerboy81 Stay Horizontal

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    #9
  10. BrooklynS

    BrooklynS Adventurer

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    Since it is still frozen here - still half a meter thick ice on the sea outside - I am not able to drive as much as I want... I don't even have the license yet. :y0!
    #10
  11. BrooklynS

    BrooklynS Adventurer

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    Yesterday when driving, the bike began to rattle and the left cylinder was really going bad. The vacuum throttle didn't move smooth and appearently there was a lot of crap in the jets. Again. And both carbs was leaking gas...

    Today I had to clean the carburators again, since they pissed gas and didn't run well. I begin to feel like an expert now, I've rebuilded these carbs eight times now (on different bikes). When reinstallated, it was time for synchronising. I use this very simple rig:
    ImageUploadedByTapatalk1396805239.481669.jpg

    The result was very good. Idling at 950 rpm, almost no vibrations (of course, the common ones), quick response and dry carbs.
    #11
  12. DoktorT

    DoktorT BigBrowedNeandereer

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    Sounds like you haven't yet pulled the tank and cleaned out all the crud. Did you pull the pet cocks? Were they full of crud? Shine a light in the bottom of the tank and see what you got. Don't keep recharging rebuilt carbs with continuing crud from the tank. Any bike that sits for more than 2 MONTHS with todays gas should be emptied and cleaned. and pull the bowls and drain the lines. Do as well replace all the fuel lines before remounting the carbs from hopefully their final rebuilt for a good 40k miles. You didn't say you actually did these things so if you did, good on you, and if you didn't, do get too the heart of the issues.
    #12
  13. DoktorT

    DoktorT BigBrowedNeandereer

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    Do like the whole dark blue metallic. US never got that on the RS. In 79 we did get that dark blue in two tone with light silver metallic. That is the one I loved and got a few years ago.

    I have never seen the extra instruments installed like that on a US machine. The perimeter rings are unique. Are those a factory install for Euro spec?

    A great example to put back in order and enjoy.

    Note: you have the original front wheel which was recalled in the US. Any US dealer will replace that for no cost here. Just clean it and inspect very closely for cracks, and see if your local dealer will replace it there as well.
    #13
  14. BrooklynS

    BrooklynS Adventurer

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    If you look at the spokes you'll see that they are reinforced, this is not the first edition wheels. Thank you for mentioning it anyway!

    The instruments are extra even in Europe.

    I haven't cleaned the tank, but I have extra filters and if course new fuel lines. Will probably clean it anyway. Thanks!
    #14
  15. BrooklynS

    BrooklynS Adventurer

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    Today I went for a ride again. Only about 35 km, as my alternator won't charge as it should.

    After my adjustments the idling is acceptable, isn't it? http://youtu.be/qhbMrSr-j9A

    :)
    #15
  16. BrooklynS

    BrooklynS Adventurer

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    Installed battery charger quick connector.
    ImageUploadedByTapatalk1397413229.582495.jpg

    Red flash means that the battery needs charging.
    #16
  17. BrooklynS

    BrooklynS Adventurer

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    ImageUploadedByTapatalk1397478731.169853.jpg

    Filling up.
    #17
  18. BrooklynS

    BrooklynS Adventurer

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    ImageUploadedByTapatalk1398154881.565865.jpg

    Coffee break, as an eagle was flying low where we sat. :)
    #18
  19. Sunbeem

    Sunbeem Enfant du Paradis.

    Joined:
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    Very enjoyable story, looks like you've done a great job.
    If you find the front brake less than perfect, a good mod is to mount a splitter under the tank, and a 13mm master cylinder on the handlebars. That's what stopped my
    '78 RS from mating with a tractor.

    [​IMG]

    Sunbeem.
    #19
  20. boxerboy81

    boxerboy81 Stay Horizontal

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    I think it's the replacement one already. See the ribs. I hope you've got a new tyre though!
    [​IMG]
    #20