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Thread: 2000 R1100RT: Coil or HES?

  1. #1
    Aspiring Profligate jeff488's Avatar
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    2000 R1100RT: Coil or HES?

    142k miles.
    This is a friend's bike.
    Died on the road. After cooling a bit, it restarts and runs for about 45 seconds.
    Pulled the coil and noticed a very slight bulge and a separation where the epoxy joins with the edge of the black plastic body of the coil.
    Secondary coil read 7390 ohms; primary reads 1.75 ohms. Used two different VOMs.
    AFIK, it should be 15k and .5 ohms, respectively.

    Am I on the right track thinking the culprit is the coil?
    Also, should we rewire the HES as long as we are in there?

    TIA,
    Jeff
    '04 Silver R1150RT "Big Oel". '05 Yellow KLR 650
    '00 Red Suzuki Bandit 600
    '65 Allstate/Puch 250 twingle
    "I just want somewhere to ride and food when I get there."

  2. #2
    Registered User roger 04 rt's Avatar
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    While both are possibilities, I would check the volume of fuel flowing in the return line to the tank to make sure you don't have a leaking hose in the tank.

    If all is well with the pump filter and hoses you'll have about 2 liters per minute flowing back to the tank at idle.
    RB

  3. #3
    MOA #24991 Pauls1150's Avatar
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    The internal tank line is certainly a very strong possibility (they do have a history), and when were the two fuel filters changed; but any physical distortion of the ignition coil makes it highly suspect regardless of the resistance. Can you compare it to a new one at the dealer's? They're difficult to test under actual "operating conditions" unless the failure becomes total.

    And yes, an older 1100 deserves upgraded wiring, even if it's not the present "Root Cause" - it soon will be...

  4. #4
    OldBMWMaster JDOCKERY132445's Avatar
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    All of the above

    A bike that old is due to have all those components replaced. It is much easier to do it in the garage than on the road.
    Jerry Dockery
    309 N. 3rd. Ave.
    Kure Beach, NC 28449
    1996 R1100RT main bike & 1985 K100RS...too fast to believe.

  5. #5
    Aspiring Profligate jeff488's Avatar
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    OK, I got a better look at the wires to the HES at the connector.
    Complete toast. THe insulation is crumbling off all the wires. So that's one mystery solved.
    We have decided to replace the coil as well.
    Plus, while we have the tank off, we'll do the internal hoses.

    I'm still curious about the coil resistances and why they are so out of tolerance.
    Perhaps this has caused a mis-firing at times.
    My buddy did say that his mileage has dropped to about 34 mpg recently, and I'm guessing that's related.

    Anyway, my buddy is looking on line for an HES that's been rebuilt and a coil from Beemer Boneyard perhaps.
    Suggestions are appreciated.
    Thanks,
    Jeff
    Last edited by jeff488; 03-17-2014 at 04:10 PM. Reason: spelling
    '04 Silver R1150RT "Big Oel". '05 Yellow KLR 650
    '00 Red Suzuki Bandit 600
    '65 Allstate/Puch 250 twingle
    "I just want somewhere to ride and food when I get there."

  6. #6
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by jeff488 View Post
    142k miles.
    This is a friend's bike.
    Died on the road. After cooling a bit, it restarts and runs for about 45 seconds.
    Pulled the coil and noticed a very slight bulge and a separation where the epoxy joins with the edge of the black plastic body of the coil.
    Secondary coil read 7390 ohms; primary reads 1.75 ohms. Used two different VOMs.
    AFIK, it should be 15k and .5 ohms, respectively.

    Am I on the right track thinking the culprit is the coil?
    Also, should we rewire the HES as long as we are in there?

    TIA,
    Jeff
    FYI the BMW Shop Manual has a coil specification mistake that has been copied in every manual I've seen. It states 0.5 Ohms for the primary. It's usually higher than that...
    For the secondary the BMW manual states 13K Ohms for the secondary but should be 7.5K Ohms.

    So what you measured on the secondary is bang on. This does not mean it will perform properly under load though and many have been fooled by that. If it's cracked or bulging I would definitely replace it. Probably put new wires in at the same time since they are probably just as old. Euromotoelectrics sells coils and a good wire set for a decent price.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  7. #7
    Registered User m_stock10506's Avatar
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    Jeff, I sent you a PM.
    Michael Stock, Trinity, NC
    R1100RT, R100, R60/6

  8. #8
    Aspiring Profligate jeff488's Avatar
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    Quote Originally Posted by m_stock10506 View Post
    Jeff, I sent you a PM.
    Thanks. One back to you.
    '04 Silver R1150RT "Big Oel". '05 Yellow KLR 650
    '00 Red Suzuki Bandit 600
    '65 Allstate/Puch 250 twingle
    "I just want somewhere to ride and food when I get there."

  9. #9
    Aspiring Profligate jeff488's Avatar
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    Update

    My bud has ordered the HES plate assy, coil, and plug wires from euromotoelectric.
    Should be here by Thursday.
    We might have it operational by the weekend.

    As Johnny would say "More to come".
    '04 Silver R1150RT "Big Oel". '05 Yellow KLR 650
    '00 Red Suzuki Bandit 600
    '65 Allstate/Puch 250 twingle
    "I just want somewhere to ride and food when I get there."

  10. #10
    Aspiring Profligate jeff488's Avatar
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    All parts installed and the bike was ridden today for about an hour with no issues.
    Always nice when a plan comes together.

    Thanks for the input.
    Jeff
    '04 Silver R1150RT "Big Oel". '05 Yellow KLR 650
    '00 Red Suzuki Bandit 600
    '65 Allstate/Puch 250 twingle
    "I just want somewhere to ride and food when I get there."

  11. #11
    Registered User roger 04 rt's Avatar
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    Jeff, Nice job. Everyone should have a friend like you. RB

  12. #12
    Aspiring Profligate jeff488's Avatar
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    Thanks, that's very kind, but my buddy did the dirty work. He's learning fast.

    I and another friend supplied the guiding harassment, not to mention his big, beautiful shop as
    I didn't have room for another bike.
    '04 Silver R1150RT "Big Oel". '05 Yellow KLR 650
    '00 Red Suzuki Bandit 600
    '65 Allstate/Puch 250 twingle
    "I just want somewhere to ride and food when I get there."

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