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Thread: RS No Start

  1. #1
    Sir Darby Darryl Cainey's Avatar
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    RS No Start

    My 77 RS ran great on a trip to Toronto yesterday charging all the way at 14+ volts. Parked it for a hour, then no start. just a loud click and volt meter goes to 0.

    Checked the battery connections: OK
    Tried to boost it with a car, same results: click.

    Bump started it to get home, shut it off, still no start?

    It charged OK all the way home 60 miles.

    Relay or starter?
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  2. #2
    Administrator 20774's Avatar
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    Quote Originally Posted by DARRYL CAINEY View Post
    Relay or starter?
    Yes?

    9 times out of 10, it's the battery. Rule it out...have one of the auto parts stores load test it. Or put a voltmeter across the battery terminals and watch the reading when you hit the starter button. That's basically a crude load test. If the voltage drops to 8-9 volts, it's the battery. If the voltage doesn't change, then move upstream.

    The relay is the next easiest to check first and cheapest to replace...I'd start there. Then, move on to the starter.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
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  3. #3
    Sir Darby Darryl Cainey's Avatar
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    Took the battery out to get it load tested today. Will post results later.

    Checked the starter relay, no corrosion did run over the contacts with emmery coth anyway.

    Starter was in the same place I left it

    Called my local expert and was told to check the starter nosecone.
    Looks OK in place!

    Last resort will be to pull it out.
    Ambassador BMW MOA Ontario Canada
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  4. #4
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    single clik on start attempts, or multiple cliks? could be a bad starter solenoid, likely indicated by multiple cliks.
    Ride Safe, Ride Lots

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    Check the big wires for loose connections

    Yup the ground loosens up and the big wire on the starter will do it too, then it does nothing but click and get hot. I have had to address both issues multiple times on my assortment of bikes. If you have an OEM ground wire that connects to the speedo cable retainer bolt you might give some thought to getting a longer ground cable made and running it down to the transmission mounting bolt on the bottom right side.

    Remember the K.I.S. method. Keep It Simple

  6. #6
    Minnesota Nice! braddog's Avatar
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    Are we taking bets here?

    My money's on the battery, all 2 cents of it.
    -----------------------------------------
    Brad D. - Member #105766
    '77 R100RS - Black Beauty (big pipe, baby!)
    '94 R1100RS - Sylvia

  7. #7
    Registered User lkchris's Avatar
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    99% of the time it's the battery.
    Kent Christensen
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    '12 R1200RT, '02 R1100S, '84 R80G/S

  8. #8
    Benchwrenching PGlaves's Avatar
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    If it is the battery (and it could be) I wonder why it didn't start with jumper cables?
    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
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  9. #9
    Sir Darby Darryl Cainey's Avatar
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    Took the battery to the Professional Battery Shop where I purchased it and it passed the load test.

    I kind of figured that out when it wouln't start with a boost.

    I had already checked the cables & grounds.

    The loud single click is comming from the starter area.

    The investigation continues.
    Last edited by DARRYL CAINEY; 09-26-2012 at 07:48 PM. Reason: spelling
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  10. #10
    R100GS, '89 Guenther's Avatar
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    If the thick plus wire to the starter has solid connections on either side it is either IN this wire or, the starter motor itself.

    Small chance the contact in the starter solenoid is "broke".

    I would use a jumper cable and attach the ground wire and hold the plus wire very carfully to the plus on the starter. Be prepared for the spark!!!

    If it turns its the thick red wire or its connections. Otherwise the starter motor.

    /Guenther

  11. #11
    James.A
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    Quote Originally Posted by PGlaves View Post
    If it is the battery (and it could be) I wonder why it didn't start with jumper cables?
    In my experience, a bad battery is like an electrical "black hole". It will suck all the potential out of any jumper set up. If the battery passed a load test, we can move on from there.

    A single loud (as in audible) click is almost certainly the solenoid firing. A relay firing is almost in-audible unless you have your ear right next to it.

    If you're hearing the loud clack but nothing else happens, you might try by-passing the solenoid and jumping directly to the starter motor. You do that by touching a stout jumper cable to the place where the solenoid connection disappears into the starter motor itself. As stated earlier, there might be sparks. I'm pretty sure this is what Guenther is alluding to.

  12. #12
    Sir Darby Darryl Cainey's Avatar
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    Picking up a known good starter today and having mine tested and rebiult if neccessary.
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  13. #13
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    rs no start

    starter brushes

  14. #14
    Sir Darby Darryl Cainey's Avatar
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    Quote Originally Posted by felaw View Post
    starter brushes
    Our friend Jim F traded a know good starter today and I will install it this afternoon.

    Fingers crossed!
    Ambassador BMW MOA Ontario Canada
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    1977 R100RS, (Retired) 1993 R100GS (just getting started)

  15. #15
    Sir Darby Darryl Cainey's Avatar
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    Installed the good starter today.

    Now it turns over, have to button it up now.

    Thanks to all that offered good advice!

    200,000 miles on a bebuilt starter, not bad!
    Ambassador BMW MOA Ontario Canada
    President Niagara BMW Riders #298
    Knights of the Roundel #333
    1977 R100RS, (Retired) 1993 R100GS (just getting started)

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