no idle running rich

Discussion in 'Engine, Fuel and Exhaust' started by pretty, Sep 14, 2010.

  1. pretty

    pretty New Member

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    Have a 1986 1100 Sportster w/ SU carb. NO previous problems
    No idle
    Running rich, backfire.
    Tank was dirty, just quit
    Tank cleaned, fuel lines, and carb.
    Ignition changed
    Plugs slightly wet.

    Thoughts?
     
    pretty, Sep 14, 2010
    #1
  2. Jack Klarich

    Jack Klarich Guest

    Check your float level and needle and seat, maybe trash in there:s
     
    Jack Klarich, Sep 14, 2010
    #2
  3. pretty

    pretty New Member

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    Anything other than a carb problem?
     
    pretty, Sep 14, 2010
    #3
  4. Jack Klarich

    Jack Klarich Guest

    Could be an ignition problem tho I would check the carb first JMO:s
     
    Jack Klarich, Sep 14, 2010
    #4
  5. R. Lewis

    R. Lewis Senior Member Retired Moderators

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    Was the carb rebuilt or just cleaned? Can you, and sorry for not knowing, pull any codes on the scoot?
     
    R. Lewis, Sep 14, 2010
    #5
  6. Jack Klarich

    Jack Klarich Guest

    I dont remember older bikes like this been able to throw codes and you would probably need The Scanalizer to read them, JMO
     
    Jack Klarich, Sep 14, 2010
    #6
  7. Hoople

    Hoople Account Removed

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    Like Jack has said, Sure sounds like an over rich carb or float.

    Just curious as to what "ignition changed" mean. Are you points trigger?
     
    Hoople, Sep 14, 2010
    #7
  8. R. Lewis

    R. Lewis Senior Member Retired Moderators

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    wasnt for sure on this one Jack. :s
     
    R. Lewis, Sep 14, 2010
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  9. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

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    The only scanaliser that will work on a bike of that age is a good mechanic with a good bit of experience
    I would start on the carb not that i have ever touched that type of carb so cant help on the specifics
    it may just be that a jet has fallen out

    Brian
     
    fin_676, Sep 14, 2010
    #9