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Thread: 1985 K100RS sticking starter!

  1. #1

    1985 K100RS sticking starter!

    Hi all,

    Went out to start my 1985 K100RS and the bike didn't catch immediately, not unusual when cold, but the starter did not disengage, kept chugging away. I turned the switch behind the starter button to off and it still was chugging. Turned the key off and it still was chugging away. Finally grabbed an allen wrench and disconnected the battery ground, which stopped it.

    Is this most likely a stuck relay, which on my bike means a decent amount of work to simply get to as they are under the tank? Or is this a sprague clutch issue in the engine, or a stuck solenoid, or ??

    It was pretty disconcerting. With the ignition switch turned off at least the fuel injection system was not pumping fuel.

    Yeah, Happy New Year...

    Steve

  2. #2
    Liaison 20774's Avatar
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    There's a thread on stuck starters in the K-Bike DIY section:

    https://forums.bmwmoa.org/showthread...arter-stuck-on
    Kurt -- Forum Liaison ---> 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
    Thanks. Found it.

    Seems like a good idea to replace the relay, which is now 35 years old...

  4. #4
    Registered User GTRider's Avatar
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    And charge or replace the battery while you are at it. K-bike starter relay contacts have been known to stick when the bike is cranked on a low battery, and the sticking relay results in the non-stop starter you experienced.

    Best,
    DeVern
    DGerber
    1983 R80ST 1984 R80 G/S-PD 2004 K1200GT w/Hannigan S/C 2010 K1300GT 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

  5. #5
    Dances With Sheep GREGFEELER's Avatar
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    I've had to buy this relay before. This is a common relay and physically and mechanically identical versions are available. Here are my notes about sources.


    2. Stock part is Bosch # 0 332 002 161 which is superseded by # 0 332 002 168.
    b. Bosch relay suppliers:

    3. TV/Tyco makes the same relay with their number: V23232D0001X001-EV-260.
    Greg Feeler
    Ambassador & amateur K-Bike collector, it seems
    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

  6. #6
    Wow, I had no idea this was such a common issue. Never had this on my trusty R65...

  7. #7
    Thanks for the info on suppliers for relays. And, it appears I can replace it by tilting the tank forward instead of having to depressurize, drain, and remove it.

  8. #8
    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by stevenm View Post
    Thanks for the info on suppliers for relays. And, it appears I can replace it by tilting the tank forward instead of having to depressurize, drain, and remove it.

    Correct. You will need an 8mm socket to remove the retaining bolt, and for the cable attachment bolts (or a flat blade screw driver). If you are curious, you can test the old relay to see if it's opened back up as others here have said. I had a battery problem with my K75S a year ago and had two relays stick, but both opened up on their own after cooling down.
    Greg Feeler
    Ambassador & amateur K-Bike collector, it seems
    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

  9. #9
    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by stevenm View Post
    Wow, I had no idea this was such a common issue. Never had this on my trusty R65...
    Very different wiring harness on an Airhead from a K-bike.
    Greg Feeler
    Ambassador & amateur K-Bike collector, it seems
    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

  10. #10
    Quote Originally Posted by stevenm View Post
    Wow, I had no idea this was such a common issue. Never had this on my trusty R65...
    This used to happen a lot with the classic K bikes. Back when I was writing my monthly column Benchwrenching in the Owners News I would get several phone calls every spring after bikes had been parked over the winter. Sometimes I could hear the starter sluggishly trying to crank in the background over the phone. It happened so often that when I wasn't home and the caller said the word starter Voni would tell them it was a stuck relay and to disconnect the ground from the side of the transmission. And to then call back later.
    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/

  11. #11
    Registered User terri1957's Avatar
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    Which begs the question: do you need to periodically replace the relay? My 95 has never had its relay replaced (but I always keep my battery charge since Im aware of this problem).

  12. #12
    3 Red Bricks
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    Quote Originally Posted by terri1957 View Post
    Which begs the question: do you need to periodically replace the relay? My 95 has never had its relay replaced (but I always keep my battery charge since Im aware of this problem).
    Nope. Just keep the battery charged and stop cranking if it cranks slow. A proper running K should start within a second or two. To continue cranking just runs the risk.


    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  13. #13
    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by 98lee View Post
    Nope. Just keep the battery charged and stop cranking if it cranks slow. A proper running K should start within a second or two. To continue cranking just runs the risk.


    Greg Feeler
    Ambassador & amateur K-Bike collector, it seems
    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

  14. #14
    Quote Originally Posted by 98lee View Post
    Nope. Just keep the battery charged and stop cranking if it cranks slow. A proper running K should start within a second or two. To continue cranking just runs the risk.


    plus many +++++
    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/

  15. #15
    I think it also may have something to do with heat. With a fully charged battery and a new relay, bike started up just fine. Went for a ride, shut off the bike. No problem. An hour later took the bike out again, started right up, stopped bike. After 10 minutes went to start again and the starter motor stuck on again, turned off key, still chugging away. Turned key back on, bike started, but I don't know if the starter was still energized. Rode bike home, turned off key, still chugging, disconnected battery ground strap. Measured battery- 13.16 volts. Let the bike cool off for several hours. Touched battery ground to case, nothing. Connected battery ground, bike started right up, and shut off properly.

    Will the updated relay, with the microprocessor circuit to prevent starter from sticking, bolt into my 1985 K100RS without modification?

    Thanks
    Steve

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