Question about 2006 Ducati Paul Smart 1000 LE

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Running rich, poor idle, cuts out easily at low

Running rich, poor, slow idle, cuts out easily at low rpm. will die slowing with the clutch disengaged.

Was running fine before I washed it. I probably got some water in tank due to clogged drain. But I've drained the tank, added a gallon, ran it dry, filled tank and still have the problem.
The spark plugs are black, have cleaned them up, checked the gap, still hasn't fixed the problem.

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  • pickel17 Jun 17, 2010

    It was the gas. WIth 10% ethanol in the gas any water will induce phase separation, so the water and ethanol are extracted and go to the bottom of the tank.
    So, poor running led to carbon fouled plugs which led to more poor running. Changed fuel filter, plugs, rode it until it cleared.

  • pickel17 Jun 17, 2010

    Actually it was the gas. 10% ethanol gas has a propensity to phase separate when water is in the tank. So, the water and ethanol were extracted and went to the bottom of the tank.
    The motor ran badly and the plugs were carbon fouled. WHich led to more poor running.
    After changing the fuel filter and the plugs and riding it for an other 50 miles it's back to normal.
    Thanks for the help. I checked coil and all other connections first. Also, it didn't recover after being dry for almost a week. It was the gas.

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  • Master
  • 2,100 Answers

It is not from water in the gas, something else is causing the problem, but I don't know what, yet. Does your bike have the new CAN wiring? Little thin wires running all over the place or the old style fat wires? If it is new style, you shouldn't have a problem with it getting wet, but the old style had 2 junction boxes up front behind the headlight, that doesn't like rain. It could have been enough to make it run lousy. Check it out and clean it if you have to. The next thing to check is the coils, the only other thing that can short out. Your bike is basically waterproof, so the washing might just be coincidence. check all the wires on the bike and under the seat, just to make sure nothing wiggled loose. Did any lights on the dash come on? Hope this helps. 2002 S4,,,99 750 monster

Posted on Jun 17, 2010

  • Ned  White
    Ned White Jun 17, 2010

    You know, that is the 3rd time I have heard that about the ethanol. I have read reports on it saying it is safe, but so far, I have seen a lot of complaints, like yours. Usually the water will just burn off with a hiccup or two. Thanks for the feedback, I will keep this in mind.

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