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Thread: Ironhead tune

  1. #1
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    Default Ironhead tune

    So here is the situation... the bike runs great!

    At decel I do not get any popping, sneezing, puttering.. between 3rd and 4th gear getting to about 50-65 range no popping, sneezing, puttering, backfire,nothing. The bike has a beautiful up shift growl to it.

    But when I check my plugs they are black.
    The plugs are new (about two weeks) Why are my plugs black if my bike seems to be running like a top? Am I just assuming the bike is running great?

    Thanks

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  2. #2
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    If it runs fine I'd leave it as is.

    Good looking bike BTW.

  3. #3

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    plugs will get sooty if you spend a lot of time idling or moving in slow traffic as the engine doesn't get hot enough to burn off the carbon deposits on the plugs. For a true reflection of plug health you need to get it into top gear and maintain a period of WOT acceleration before cutting the engine and pulling in to check the plugs. If they are still black you can always swap to next jet size down on the carb but I would think you probably just need to turn your idle mix screw in a quarter turn or so.

  4. #4

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    Ironheads usually like to be fatter down low and leaner up top. A main jet as small as 66 in your Super E is not that unusual for an XL (depending on your altitude, humidity, etc., of course).

    Jim

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    Thanks for the responses. Im going to do some test runs with it and adjust the idle mix and see if that helps.

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    Quote Originally Posted by MFC View Post
    Thanks for the responses. Im going to do some test runs with it and adjust the idle mix and see if that helps.
    Show us pics of your plugs........... Before and after adjusting......

  7. #7

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    The bike looks nice, but the pipes say the timing is late to me.

  8. #8

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    Quote Originally Posted by 70fatster View Post
    The bike looks nice, but the pipes say the timing is late to me.
    Right? I said the same thing in his last thread.

    Jim

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    The timing was too advanced. I’ve adjusted the timing since, and bike has run great. I’m not having any issues with how the bike is runnin just the color of the plugs

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    Quote Originally Posted by MFC View Post
    I’m not having any issues with how the bike is runnin just the color of the plugs
    What color are the plugs?????????

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    Quote Originally Posted by Tattooo View Post
    What color are the plugs?????????
    Black soot.

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    Last edited by MFC; 07-24-2019 at 7:40 PM.

  12. #12
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    Quote Originally Posted by MFC View Post
    Black soot.

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    And oily..........

  13. #13
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    No oil

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    Quote Originally Posted by MFC View Post
    No oil
    How old are the plugs?????????

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    About 2 weeks

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    Quote Originally Posted by MFC View Post
    About 2 weeks
    I wouldn't call it soot it's to shiny...... They look oily to me............ Or it's rich as fuck............

    Run your finger over the electrode and take a pic of your finger..........

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  18. #18
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    Thanks, it looks a little oily...... But it could be fuel.......... Either way it need attention...........

    What does it smell like???? Yea I know.... LOL

    Strong gas smell or an exhaust smell??

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    I would say exhaust ... but it’s hard to tell, hahaha ... it definitely doesn’t smell like fresh gas

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    Tall dome pistons and hemi Chambers like a lot of fuel down low.
    Since it's running fine...
    Try hotter plugs, they will help burn off deposits
    Or iridium ones, they'll fire even when dirty
    Make sure you are gapped to match the ignition
    Last edited by Sky; 07-26-2019 at 3:25 AM.

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