engine misfire

Discussion in 'Engine, Fuel and Exhaust' started by nascar7613, Jun 12, 2008.

  1. nascar7613

    nascar7613 Active Member

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    02 night train, carb, engine will misfire at midrange rpms when trying to accelerate ,two or three misfires then clears out. any ideas?
     
  2. glider

    glider Veteran Member

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  3. nascar7613

    nascar7613 Active Member

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    this has been going on for a while. it has been taken to the harley dealer and they changed the jets in the carb, so I assume the bowl should be clean
     
  4. glider

    glider Veteran Member

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    Very true but as you can tell, I don't trust the dealers and have good reasons.

    I could be water in the tank also that draining the bowl will give you temp relief to diagnose it.
     
  5. nascar7613

    nascar7613 Active Member

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    so it sounds like a fuel problem to you. It feels like a spark plug or plug wire breaking down, but both have been changed and the problem persists. the bike was put on a dyno and the air fuel seemed to be rich, running below 12:1 everywhere. could that be the problem?
     
  6. glider

    glider Veteran Member

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    Without knowing till now that the wires and plugs were changed, I would approach the fuel by draining the bowl and see if it makes a difference. Try to catch the draining fuel in a glass to let it settle and see if you can visualize any water in the bottom of the glass. The drain comes out in front of the rear wheel.

    A rich mixture will usually only show as poor MPG and a poor response from the throttle but rarely show as you are experiencing unless it is fouling a plug. Check the gap recently on the new plugs?
     
  7. nascar7613

    nascar7613 Active Member

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    this carb does not have the drain screw
     
  8. glider

    glider Veteran Member

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    Are you looking from the opposite side of the bike than the carb and between the cylinders at the back of the carb?
     
  9. nascar7613

    nascar7613 Active Member

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    yes I am, there is no screw that I can see
     
  10. glider

    glider Veteran Member

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    Look again:D

    Most of them have it.