Question about 1991 BMW K 1

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Bike stops after 30 minutes of riding.

1990 model BMW K1 with 105,000 km. The following problem only appears in warm weather, around 23 degrees celsius or above. Below this temperature the bike operates normally. Bikes starts and operates normally for about 25 minutes then begins to develop a small stutter and continues to get worse until the engine stops. Problem does not appear to be related to the engine temperature. Hall sensors have been replaced with no change in symptoms. Note only the sensors were replaced, wiring harness and sensor mounts all original. I have a scope trace of the trigger wires from the hall sensors, one sensor appears normal but the other has a second pulse of about half amplitude at 180 degrees from the primary pulse (I have a picture I can send that's a lot clearer than my explanation). I've heated the motronic unit, coils and ignition unit with a heat gun with no conclusive results. Any help much appreciated.

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  • reddust Nov 25, 2008

    Checked colis last night

    Cold Primaries are 0.9 an 1.0 Ohms, same hot. Secondaries are 12.9 and 13.0 kilo Ohms cold, 14.6 and 14.4 kilo ohms hot.

  • paul erickson
    paul erickson May 11, 2010

    have you checked the resistance of your ign coils cold and hot?

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Sounds like your bike is running to rich.
Check your exhaust pipe for carbon build up,which would indicate mixture is to rich, as it heats up it only gets richer.
Hope this helps.

Posted on Nov 26, 2008

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