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Thread: Possible emergency, or am I being a wuss?

  1. #16
    Macrunch MCrenshaw's Avatar
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    While you have the tank off take a few minutes to check the coils and the resistance. You don't mention if you have points or converted to electronic but setting the valves and checking points never hurts. Having said that, all of the above suggestions have merit and a good going over is always a good thing.

  2. #17
    MOA #24991 Pauls1150's Avatar
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    All of the above, plus:

    Even a brand-new condenser can be NFG...
    Older points + condenser may show the symptom of pitting on one side of the points and buildup on the other side, but newer parts won't show this.
    Also make sure the wire from the points cavity isn't getting mashed where it feeds through the square grommet.

  3. #18
    Registered User lmo1131's Avatar
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    I dropped the bowls, and they both had some fine, -incredibly- fine, rust powder in the bottom of the bowls. I flushed them, and flushed the float valves, and put everything back together. No change.
    You didn't mention if it was on both sides.

    I had this happen on the right cylinder of my /5. It turned out to be a plugged main jet. Easy to check too.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  4. #19
    Registered User lkchris's Avatar
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    If you have a tang bag, verify that it's not sealing the area around the gas cap. It has to breathe so that fuel can flow.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  5. #20
    Rally Rat
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    both sides had the rust powder in the bottom. I've got the tank bleeding out, and it looks to be flowing pretty freely.
    ... worried that this might be electrical.

  6. #21
    Jack Ethridge
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    Stumbling

    Quote Originally Posted by James.A View Post
    If it gets to the point of annoying or slowing up the trip then you owe it to yourself to check out a few of the issues raised by our fellow airheads. In my Iowa instance, I was able to get home with only an occasional stumble. I found that the rubbing block where the points ride against the cam had worn enough to knock about .004 of gap out of the equation. This with about 1000 to 1500 miles since the last tune-up.

    The clutch started slipping as well, but that's a whole other story.

    On the fuel delivery side, if you typically ride with one petcock open, try using both. This assumes that the fuel crossover is plumbed in.
    This happened to my 83 R100RT. I was advised to pull the tank and unplug,clean a plug back every electrical conection I could and spray contact cleaner in the ones not unpluged. This was 4/5 years ago and no problms sence.

  7. #22
    Rally Rat
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    Opened the tank. Found lots of red dust and chunks of tank liner. Cleaning that out as best I can.

    Pulled a plug. Red/brown caked on stuff. Possibly fused rust? Replacing. Coil crossover is clean and tight.

  8. #23
    Rally Rat
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    ok, just got back from test run.

    1.cleaned tank/filters as best I can. Apparently ethanol gas is eating the previous liner. So, a replacment is forthcoming.

    2. new plugs.

    3. cleaned out carbs with carb spray.

    Results.

    Still missing, but less freqency, and less severity/duration.

    I suspect my problem is electrical. Anyone know where I can get points/condenser for a 1977 r75/7 in Austin, Texas?

  9. #24
    Registered User lmo1131's Avatar
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    The only thing I found.

    Lone Star BMW
    10600 North Lamar Blvd
    Austin, TX 78753
    512-451-7979
    800-729-3807

    Next closest is

    ALAMO BMW
    25600 IH-10 W
    SAN ANTONIO, TX 7800
    (210) 828-5511

    Boxer By Bruce is up in Pantego (Dallas/Fort Worth)
    Bruce Davidson
    (817) 265-8065
    3620-4 Graves Blvd.
    Pantego, TX 76013

    edit -

    No substitute ignition parts show up in the MOA Resources & Links page.

    My /5 had similar symptoms when one of the OEM BERU (metal type) spark plug caps failed due to trapped moisture causing the internals to corrode. I replaced them with NGK LB05FP caps. They were like $4 at a local bike shop. Instant fix.

    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  10. #25
    Rally Rat
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    those are, IIRC, 5k ohm resistor caps, correct? I thought they were supposed to be 1k ohm. I'm running 1k ohm vw beetle caps. 1.99 ea.

  11. #26
    Registered User lmo1131's Avatar
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    yes, they ARE 5 ohm (and they are supposed to be) :-)


    Strike that....
    the BERU caps are 1 ohm. My /5 however runs fine on the 5 ohm NGK.

    See > http://faq.f650.com/FAQs/PlugCapsnCoils.htm
    Last edited by Lmo1131; 03-07-2013 at 12:06 AM.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  12. #27
    Rally Rat
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    I was under the impression that points based pre 1979 ignitions required a 1k ohm resistor cap.

    It's what's specified in the book( clymer manual), and it's what came off the bike origionally.

    It's also recommended by 'Snowbum'.

    link - http://bmwmotorcycletech.info/sparkplugs.htm

    details about half way down.

    the points and condenser were replaced about 1000 miles ago. I -think- that the problem might be that the coils have never been replaced, and may simply have reached that point in thier life where it's time to replace. but first step will be checking the gap.

    dammit, I wish I was home, where my tools are.

  13. #28
    Registered User lmo1131's Avatar
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    see my edit...
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  14. #29
    Rally Rat
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    yay, deuling edits....

  15. #30
    Administrator 20774's Avatar
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    Quote Originally Posted by Roguetek View Post
    I was under the impression that points based pre 1979 ignitions required a 1k ohm resistor cap.
    Beginning with the /6, certainly the late /6, the caps were all 5K ohm. The early /5s had the 1K ohm caps.
    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!

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