Results 1 to 15 of 27

Thread: Help Troubleshoot

Hybrid View

  1. #1
    Registered User Manitou_Commando's Avatar
    Join Date
    Mar 2008
    Location
    Manitou Springs, CO
    Posts
    74

    Help Troubleshoot, Please?

    OK, 1988 R100RS, 81,000 relatively troublefree miles. It's white if that matters.
    A few days ago, my bike was reluctant to start in 45 degree weather. Previously it would start in the coldest weather, even 20 degrees. So as the day warmed up, it started right up at about 55 degrees. Three times in the last few days, after starting and about 1/2 mile down the road, the engine dies. Just dies. And it doesn't start right back up immediately.
    Has gas, has a battery that is always on a tender. Plenty of ability to turn over the engine.

    Here is a kicker before someone tells me it's grounding out. After that one time per outing when it dies and it warms up. it does not die which makes me think it's not electrical.
    What defies logic is why both cylinders die simultaneously which does make it seem electrical in nature. Snowbum's carb page states that my reported symptom is characteristic of needle and jet wear. Dying shortly after starting.

    Anyone have a similar experience?
    Rick

    It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. A. Lincoln

  2. #2
    Registered User kentuvman's Avatar
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Posts
    868
    Have you tested your coil?

    My '82 R65LS had the oem grey crack-o-magic coil notorious for cutting off electricity at the exact wrong time - especially in rain.
    Ken Tuvman
    Excelsior, MN
    K75s, R65LS, R60/5

  3. #3
    Registered User Manitou_Commando's Avatar
    Join Date
    Mar 2008
    Location
    Manitou Springs, CO
    Posts
    74
    This is New Mexico. We haven't seen rain in months. It's a Dyna coil and not OEM.
    Wer it the coil, the symptom would not abate after warming up.
    Rick

    It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. A. Lincoln

  4. #4
    Registered User
    Join Date
    Dec 2007
    Location
    Reno, NV
    Posts
    1,962
    Are you getting spark? Don't do the grounding to the head thing with your electronic ignition, that will likely make matters worse. Use an inductive timing light or in line plug checker. They both fire sinultaneously.
    Both the ignitor on the frame and the "bean can" are heat sensitive. if you are getting no spark, the ignitor is vastly cheaper. But I have had 3 bean cans, but only one ignitor, die in past 5 years.
    I vote this is electrical issue.
    Jiggle your key in there when it won't restart, it is possible your ignition switch innarrds are disintegrating. Ditto the kill switch.

  5. #5
    Sir Darby Darryl Cainey's Avatar
    Join Date
    Mar 2003
    Location
    Fenwick, Ontario Canada
    Posts
    2,140
    When is the last time you adjusted your valves?

    I know on my bike if it won't hold an idle I reset the valves and all is good.
    Ambassador BMW MOA Ontario Canada
    President Niagara BMW Riders #298
    Knights of the Roundel #333
    1977 R100RS, (Retired) 1993 R100GS (just getting started)

  6. #6
    Minnesota Nice! braddog's Avatar
    Join Date
    Jun 2003
    Location
    Twin Cities - MN
    Posts
    1,914
    About 3 years ago, I had a similar problem, but not so much with starting. The bike would just stop, sometimes at very inconvenient places. Sometimes it would start right back up, sometimes it wouldn't. It was losing spark. There was an issue with wiring. I couldn't sort it out, but my mechanic did. He ended up replacing a wiring harness. The old one had been hacked and spliced so many times, that it was really the best option.

    I'm thinking this is less related to the actual ambient temps and more related to some electrical problem. It's a 25 year old motorcycle, wires get stretched and corroded over time. Electrical/spark issues have cropped up mutliple times over the years on my 36 year old RS. I've owned this bike almost 13 years now. In that time, I've replaced the starter, the battery (twice), wiring harness, left handlebar switchgear, horn relay, starter relay, and other minor wiring issues. I've also replaced the plug wires and plugs, but that was more of just doing maintenance.

    Good Luck, you've got some troubleshooting ahead of you, me thinks.
    -----------------------------------------
    Brad D. - Member #105766
    '77 R100RS - Black Beauty (big pipe, baby!)
    '94 R1100RS - Sylvia

  7. #7
    Registered User Manitou_Commando's Avatar
    Join Date
    Mar 2008
    Location
    Manitou Springs, CO
    Posts
    74
    Quote Originally Posted by DARRYL CAINEY View Post
    When is the last time you adjusted your valves?

    I know on my bike if it won't hold an idle I reset the valves and all is good.
    I have not lately adjusted the valves. Perhaps that is next.
    Rick

    It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. A. Lincoln

  8. #8
    Registered User Manitou_Commando's Avatar
    Join Date
    Mar 2008
    Location
    Manitou Springs, CO
    Posts
    74
    Quote Originally Posted by jforgo View Post
    Are you getting spark? Don't do the grounding to the head thing with your electronic ignition, that will likely make matters worse. Use an inductive timing light or in line plug checker. They both fire sinultaneously.
    Both the ignitor on the frame and the "bean can" are heat sensitive. if you are getting no spark, the ignitor is vastly cheaper. But I have had 3 bean cans, but only one ignitor, die in past 5 years.
    I vote this is electrical issue.
    Jiggle your key in there when it won't restart, it is possible your ignition switch innarrds are disintegrating. Ditto the kill switch.
    Actually, I timed it with a light last week.
    Rick

    It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. A. Lincoln

  9. #9
    Monza Blue 1974 R90/6
    Join Date
    Dec 2006
    Location
    Delaware
    Posts
    427
    Quote Originally Posted by manitou_commando View Post
    Actually, I timed it with a light last week.
    I was thinking valves, same as Darryl, but since you mentioned timing ... did you check the timing, or check and change the timing?

    Barron

  10. #10
    Registered User
    Join Date
    Dec 2007
    Location
    Reno, NV
    Posts
    1,962
    Quote Originally Posted by manitou_commando View Post
    Actually, I timed it with a light last week.
    I meant, is there spark when this occurrence happens, and you can't get it started? Issues with the ignitor, bean can, or especially ignition switch can appear and disappear seemingly randomly. It makes no difference if you had successfully adjusted timing recently, where the failure event is somewhat random. If you take an inline spark checker with you, you can check for spark right after it dies and won't start. Then you can eliminate, or focus on, your electrics.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •