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Thread: 2007 xb12s lightning backfires and dies

  1. #1
    Junior Member
    Join Date
    Jun 2015
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    4
    I have a 2007 xb12s lightning that has 7800 miles on it and one day when I went to go get on the interstate the bike backfired at 4500 rpms and died on me. I took it to Harley Davidson they change the spark plugs spark plug wires all fluids put it on the dyno and could find nothing. however the bike still runs like s*** anytime I get on it. This usually happens in the third gear 4500 rpm at 80

    I need help!

  2. #2
    Senior Member
    Join Date
    Mar 2015
    Posts
    111
    The dealers do not seem to have a good reputation. You do not state what you have done or checked, condition or history of the bike. Have you removed cleaned the grounds and checked for proper torque on those connections as well as the battery? Are the the subframe bolts tight, joining surfaces clean? May not be an issue with such a low mileage bike, but the history is unknown. Gotta start somewhere.

  3. #3
    Junior Member
    Join Date
    Jun 2015
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    4
    ok the condition of the bike is amazing. I check the battery I checked the grounds they went through and cleaned all of the electrical connections. I'm thinking ecm issue.

  4. #4
    Senior Member
    Join Date
    Jun 2008
    Posts
    515
    Take a good look at your fuel system as it sounds like you might be running out of fuel. Ecm's seldom go bad and it would probably no be so consistent. If fuel, it will probably get worse the longer and heavier the load. Weak pump or a very good chance of a crack in the hard plastic flex line inside the tank. Filter in the tank could be plugged.
    Matt

  5. #5
    Junior Member
    Join Date
    Jun 2015
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    4
    Fuel pump has full pressur. I'll check the hard plastic flex line inside the tank

    Can I get to it by taking the fuel pump out?

  6. #6
    Junior Member
    Join Date
    Jun 2015
    Posts
    4
    HD thinks cam potion sensor



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