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Thread: Side cover removal for battery replacement '95 r100

  1. #16
    I can only confirm that my 95 r100rt has the "flat" tool tray and the bigger (28 Ah) battery. Quite frankly, I don't see how the smaller battery would cope in the cold weather, with heavy use of heated grips and having to crank the bigger engine.

  2. #17
    Heated grips pull little current, but regardless, that has nothing to do with the size of starting battery that is needed. It has only to do with how much alternator is needed during use. The larger battery is only an "upgrade" if you need more weight. The new R1200's have an even larger and higher compression engine plus the electrical load during start-up of the fuel pump and fuel injection system. They start just fine with a 14 amp-hour battery. The K1600GT owners often replace the 19AH BMW gel battery with an Odyssey PC680 (18 AH) battery. It starts the big 6 easily and will fit in the small airhead battery tray. I used the PC680 in my R1150 for a decade or so with no issues.

    The smaller battery is fine unless the bike is in horrible tune and you have to smoke the starter to get it running. In my opinion, the airheads only needed the larger battery back when they had Bosch starters (and higher compression). Even then, properly tuned, the smaller battery would get the job done.
    Lee A. Dickinson - Danielsville, GA USA
    Airheads #3480 | Iron Butt Assn. #8914
    1976 R75/6 - 1992 R100RS - 1993 K1100RS - 2013 R1200GS

  3. #18
    Registered User toooldtocare's Avatar
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    Remember, airheads donít have fuel injection, computer controlled ignition systems, or geared-high speed starters. Those things help modern bikes, like cars, start better. Iíve had times that I wished my R1200 had a bigger battery, like cold mornings in the mountains of New Mexico. There wasnít always a lot of cranking power there, even when the bike was new.

  4. #19
    My '86 R80 had the smaller battery at first, but, at my mechanic's suggestions, I opted to replace it with the larger one, and amputate the tool box to allow it. I'll stand corrected as to at least some of the 1000cc bikes, though I think I remember the 1000cc GSes also having the smaller battery. I don't recall my R80 being in a problematic state of tune, but starting it on Wisconsin mornings could, and did, provide a few episodes of "solenoid clacking only" from a bike and battery that were only a couple of years old. Perhaps my 18-amp battery was at its natural end, but my imprecise butt dyno never noticed the extra weight of its larger/higher-capacity replacement, and it solved my starting issues and lasted longer.

  5. #20
    Quote Originally Posted by toooldtocare View Post
    Remember, airheads donít have fuel injection, computer controlled ignition systems, or geared-high speed starters. Those things help modern bikes, like cars, start better. Iíve had times that I wished my R1200 had a bigger battery, like cold mornings in the mountains of New Mexico. There wasnít always a lot of cranking power there, even when the bike was new.
    Note that an R100 has 500cc coming to compression as it cranks. A K1600 has only 266cc coming to peak compression as it cranks.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  6. #21
    My Valeo starter measures 120 amps stalled and settles to about 100 amps while spinning the 1993 R100 motor. Either the 220 CCA of the 18AH battery or the 365 CCA of the larger battery are adequate. If I had a sidecar with a 700CCA auto battery in it, that would work too. If it takes 30 seconds to start the airhead on a cold morning (it shouldn't) then any of these batteries have sufficient reserve capacity. If it is not working, something is wrong. If a 220CCA battery cannot deliver 100 amps, something is wrong. If the bike won't light off in 30 seconds, something is wrong. Maybe a larger battery allows things to be more wrong before it goes click-click-click. I'm sure a large sulfated battery could start an out-of-tune airhead on a winter day better than a small sulfated battery could. But, with a good battery and a tuned bike, you would never know without looking which battery was installed.
    Lee A. Dickinson - Danielsville, GA USA
    Airheads #3480 | Iron Butt Assn. #8914
    1976 R75/6 - 1992 R100RS - 1993 K1100RS - 2013 R1200GS

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