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Thread: 1978 r100s

  1. #1
    Registered User godfather's Avatar
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    1978 r100s

    The R90 I was looking at sold so now I plan on looking at a 1978 R100S this week.

    Less than 2000 miles on tires (metzeler lazertec) fresh tuneup and liquids end to end.
    It has BMW side cases (no cracks no leaks). Newer brake pads with SS lines.
    80,000 miles all original except heated grips and new taller wind shield on the S fairing.
    1/2 " x 1.5" dent in tank near the right side of the tank.

    Since I am not familiar with the R100S, are there any inherent issues I should be concerned with, or any specific areas to check out. I do know about the basics of looking at any used motorcycles, just curious about this particular model.
    From the photos it looks like the clutch adjuster at the lever is out quite far, so it may need a clutch.

    Any pros or cons about the 78' R100S are appreciated.

    Thanks in advance.
    Attitude is everything!
    1978 R100/7
    08' V-Strom 650 great light weight tourer

  2. #2
    Administrator 20774's Avatar
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    Nothing particular to consider with a '78. Eventually it will need a top end...80K is starting to get close to that time for at least considering it. Ask about valve clearances...how have they held up between checking? If they've been closing up quickly within each 5K miles, it's getting to be that time. Ask about other maintenace such as transmission splines (if it needs a clutch, he's probably not been inside there) and wheel splines.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
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    I doubt that the clutch cable adjuster at the handlebar being adjuster out (taking up slack) is an indicator of clutch problem. It simply could be, and is most likely the case, that the adjuster at the back of the trans. just needs adjusted "in" (taking up slack) and the handlebar adjuster can then be adjusted back in to compensate for it.

    Or...the cable could simply be stretched.

  4. #4
    Registered User lkchris's Avatar
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    If you had an R60/5 you're fairly familiar with this R100S as it's simply evolutionary changes and a combination of small handlebar and fairing that make it a specific model.

    The real changes to Airheads came in 1981 and they make the previous versions farm equipment in comparison. Light flywheel/easy clutch, brakes not under tank any more, no-adjustment-required calipers, electronic ignition, nikasil cylinders. Prices for these are often pretty close to those for early /7s and the old models are overpriced when they are.

    Here, for example, is a random ad (just hit my email) for a fabulously better Airhead than a '78 R100S, and if the price of the latter isn't something in the range of 1/3 of this it's overpriced. http://marketplace.ibmwr.org/ads/view/id/213881
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  5. #5
    Registered User blackbeauty's Avatar
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    100s

    Godfather,

    The bike you're talking about in Grand Rapids, Bob sold the bike to me on Friday last week. I sent him a check and picking the bike up in a couple weeks. The clutch was replaced at 55k and the spline was taken care of at that time. The tank will be stripped, dent removed, relined and painted along with the scratched fairing and faded cowling. The paint job on this two tone is expensive. My neighbor has the exact same bike.
    There is another nice 1983 100s conversion from a RT after I ran the Vin
    With a Corbin seat near you, too.








    QUOTE=Godfather;896315]The R90 I was looking at sold so now I plan on looking at a 1978 R100S this
    week.

    Less than 2000 miles on tires (metzeler lazertec) fresh tuneup and liquids end to end.
    It has BMW side cases (no cracks no leaks). Newer brake pads with SS lines.
    80,000 miles all original except heated grips and new taller wind shield on the S fairing.
    1/2 " x 1.5" dent in tank near the right side of the tank.

    Since I am not familiar with the R100S, are there any inherent issues I should be concerned with, or any specific areas to check out. I do know about the basics of looking at any used motorcycles, just curious about this particular model.
    From the photos it looks like the clutch adjuster at the lever is out quite far, so it may need a clutch.

    Any pros or cons about the 78' R100S are appreciated.

    Thanks in advance.[/QUOTE]

  6. #6
    Registered User blackbeauty's Avatar
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    1983 100s

    Godfather,

    This is a really nice bike, too. It's not too far from you and the only concern is it was converted from a RT based on vin. If you want a bike to ride that looks great, this is a better bike. I just was crazy enough to want to restore either a 90s or a 100s. My neighbor won't ride the identical bike with me due to what people will think..

    http://grandrapids.craigslist.org/mcy/3986702702.html

  7. #7
    rsbeemer 22600's Avatar
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    What Kurt said

    I only have about 48k on my '78 and not much adjustment left on the valves......time for head job. Then again, I had over 80k on my '80 r100rs Euro Mdl. and plenty of adj. left and never had the heads off since new.

    DW
    1978 R100rs MOA#22600 125cc Kymco
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.

  8. #8
    Registered User godfather's Avatar
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    [QUOTE=blackbeauty;896379]Godfather,

    The bike you're talking about in Grand Rapids, Bob sold the bike to me on Friday last week. I sent him a check and picking the bike up in a couple weeks. The clutch was replaced at 55k and the spline was taken care of at that time. The tank will be stripped, dent removed, relined and painted along with the scratched fairing and faded cowling. The paint job on this two tone is expensive. My neighbor has the exact same bike.
    There is another nice 1983 100s conversion from a RT after I ran the Vin
    With a Corbin seat near you, too.



    That is/WAS the one. I talked to Bob this am and he told me he is waiting for a deposit this week.
    Best of luck with it.

    M
    Attitude is everything!
    1978 R100/7
    08' V-Strom 650 great light weight tourer

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