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Thread: Cold low speed pop back

  1. #1
    Junior Member Just broke my cherry!
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    Cold low speed pop back

    My 2007 road king with efi pops back thru the intake when I first start riding at low speed. After it warms up it runs fine. It's been maintained to HD specs. Any help would be appreciated.

  2. #2
    Administrator AdminSenior Member Wide's Avatar
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    Lean pop
    Most likely intake gaskets, very common when it gets cold, soon as it warms up they expand and seal

    Good luck
    .-/c-.,_ /
    (_)'==(_)

    "Logic will get you from A to B. Imagination will take you everywhere"

  3. #3
    Junior Member Just broke my cherry!
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    Thanks

    Thanks Wide I'll check that out.

  4. #4
    Administrator AdminSenior Member Wide's Avatar
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    Other thing it may be is just running a bit lean due to cold weather. If you never had the ECU mapped that may do it. If a carb them most likley gaskets
    .-/c-.,_ /
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    "Logic will get you from A to B. Imagination will take you everywhere"

  5. #5
    HCG Technical HCG SupporterHCG TechnicalSenior Member
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    one of the things that is often left out of a ride is the start up. letting the bike idle for a bit before taking off not only allows the ecu to catch up, but also allows the engine components come to temp. we let ours go for at least 5 minutes (rocker covers too hot to keep your hand on). just a thought....

    j

  6. #6
    Administrator AdminSenior Member Wide's Avatar
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    Quote Originally Posted by junior View Post
    one of the things that is often left out of a ride is the start up. letting the bike idle for a bit before taking off not only allows the ecu to catch up, but also allows the engine components come to temp. we let ours go for at least 5 minutes (rocker covers too hot to keep your hand on). just a thought....

    j

    Merry Christmas!!!!!
    .-/c-.,_ /
    (_)'==(_)

    "Logic will get you from A to B. Imagination will take you everywhere"

  7. #7
    Junior Member Just broke my cherry!
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    Popping noises (and occasional misfires)

    Hi. I hope that someone is still reading this thread.
    I have a 2000 Road King, and I would get a lot of "popping" and occasional misfires when my bike is warming up, or idling.
    After reading some of the other posts in this group, I checked and tightened all four of my exhaust nuts down a good 1/2 turn.
    This reduced most of the "popping" and misfires. I sprayed WD-40 around the intake manifold seals with no noticeable change in symptoms.
    I dropped the carb, and cleaned the float bowl and the jets, but they were basically already clean.
    I replaced the spark plugs, the fuel line, and the inline fuel filter that I run, at the same time.
    I have 87,000 miles on this bike, and I had to park the bike outside last winter. (It was covered with a bike cover)
    Have any of you ever had any improvements when you replaced the plug wires?
    I know the "popping" and mis-fires are trying to tell me something, but I'm too naive to know what.
    Any suggestions?
    Sleepyjohn

  8. #8
    Administrator AdminSenior Member Wide's Avatar
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    Intake leaks is a big thing during cold start, pops if any leak at all
    .-/c-.,_ /
    (_)'==(_)

    "Logic will get you from A to B. Imagination will take you everywhere"

  9. #9
    Junior Member Just broke my cherry!
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    Quote Originally Posted by Wide View Post
    Intake leaks is a big thing during cold start, pops if any leak at all
    Thanks Wide.

    I double checked my intake seals, and made sure the hardware was tight, too.
    I replaced the donut between the carb and the intake manifold (I just happened to have a new unused one).

    Interestingly enough, my thick gasket between the carb and my air cleaner was raggedy, and re-used one time too many times.
    So i replaced that gasket, and put the stock inner air cleaner cover back on, and the air cleaner.

    My baby started right up, and purred real nice!
    So I put the air cleaner cover back on, and put my tools away.

    My little bit of popping at startup/idle turned out to be four loose exhaust nuts, and a shredded air cleaner gasket.
    Thanks for your thoughts and suggestions.
    Hope i can return the favor sometime.
    Sleepyjohn

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