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    higg55's Avatar
    higg55 Posts: 4, Reputation: 1
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    #1

    Apr 3, 2013, 11:42 AM
    2005 harley heritage
    What would make the rear spark plug foul with in minutes of replacing and start skipping I have been told rings or valves hoping that there's another reason
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Apr 3, 2013, 11:58 AM
    Valves shouldn't make it foul. What is the compression? Sure the plug wire is good?
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    higg55 Posts: 4, Reputation: 1
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    #3

    Apr 3, 2013, 02:17 PM
    Not sure of compression and used 2 brand new plugs but full of carbon after a mile or two
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    higg55 Posts: 4, Reputation: 1
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    #4

    Apr 3, 2013, 02:20 PM
    Quote Originally Posted by ma0641 View Post
    Valves shouldn't make it foul. What is the compression? Sure the plug wire is good?
    Not sure of compression,used 2 new spark plugs and were full of carbon within two miles
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    ma0641 Posts: 15,675, Reputation: 1012
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    #5

    Apr 3, 2013, 02:42 PM
    Fouling that fast indicates the cylinder is not firing or you have an oil issue. Check the compression. Oil fouling indicates low compression, bad rings, possible head gasket. Carbon fouling indicates weak spark or too much fuel. Is this an injected model?
    higg55's Avatar
    higg55 Posts: 4, Reputation: 1
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    #6

    Apr 4, 2013, 04:28 AM
    Quote Originally Posted by ma0641 View Post
    Fouling that fast indicates the cylinder is not firing or you have an oil issue. Check the compression. Oil fouling indicates low compression, bad rings, possible head gasket. Carbon fouling indicates weak spark or too much fuel. Is this an injected model?
    No it is carborated
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