Is there harm being done?

Discussion in 'Engine, Fuel and Exhaust' started by VanIsland, Apr 9, 2010.

  1. VanIsland

    VanIsland Member

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    My recently purchased dyna with stage 1 is running a little rough (and back firing etc)... I have an appointment on the 21st of April for a dyno check and tune-up.

    My question is: am I doing any harm to the engine riding it like this?

    ps -I tried to search this topic and I apologize if it has been addressed before.
     
  2. cdn-bigfoot

    cdn-bigfoot Junior Member

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    Pull your plugs and see if they're black and sooty.
    Seems you're running too rich.
     
  3. Adamal47

    Adamal47 Active Member

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    Yes start with the plugs. Compare them with this site and that will tell you where the problem could be.
    Spark Plug guide
     
  4. Hoople

    Hoople Account Removed

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    Check to see if you have any historical codes. Miss-fire, poor combustion or running excessively rich will wash unburned fuel pass the rings and into the oil. To me I would call that harmful.
     
  5. Thorns

    Thorns Active Member

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    What air cleaner, pipes, and fuel management are you using? Is the stage 1 you are referring to the dealer download? Sounds like you are lean. If the high flow a/c and high flow exhaust pipes don't match or get enough fuel needed, you will get what you are describing. Without an air/fuel ratio reading it hard to tell. Most plugs with unleaded fuel don't show much a good fuel ring on the insulator. Better to get it to the tuner.

    Thorns

    An attempt to upload this - a little hard to read.
     

    Attached Files:

    Last edited by a moderator: Apr 16, 2010
  6. VanIsland

    VanIsland Member

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    Thanks guys, I will pull the plugs in the a.m. and post my findings.
    I have a lot to learn!
     
  7. NEWHD74FAN

    NEWHD74FAN Experienced Member Retired Moderators

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    Thorns, a very good information and reads just fine. :D

    [​IMG]
     
  8. Hoople

    Hoople Account Removed

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    I agree it is interesting info. I may be wrong, but I think it would only apply to none closed loop O2 ECM systems. Just can't see ever getting colors and rings like that with A/F ratios and 10% alky gas of today using O2 feedback systems. But I still agree that it is very interesting.
     
  9. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    First thing, get a HD Factory Service Manual covering your model and year.

    I would start by looking for an intake leak and an exhaust leak. See here:

    Finding An Intake Leak - Harley Davidson Community

    Muffler Leaks - Harley Davidson Community

    See what that finds.

    TQ
     
  10. Thorns

    Thorns Active Member

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    TQuentin1, I was riding along today, and was thinking about this thread, and it hit me.....intake leak. You have posted good info.

    Thorns