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engine misfire

Engine, Fuel and Exhaust

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Old Jun 12th, 2008, 02:33 PM     #1
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engine misfire

02 night train, carb, engine will misfire at midrange rpms when trying to accelerate ,two or three misfires then clears out. any ideas?
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Old Jun 12th, 2008, 02:48 PM     #2
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Re: engine misfire

How long has it been doing this" Something new?

Have you tried to drain the carb? Look at the lower part of this post.

Poor Performance With Carb Models - Harley Davidson Community (*Poor Performance With Carb Models)
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Old Jun 12th, 2008, 03:00 PM     #3
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Re: engine misfire

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
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Old Jun 12th, 2008, 03:02 PM     #4
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Re: engine misfire

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.
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Old Jun 12th, 2008, 03:08 PM     #5
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Re: engine misfire

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?
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Old Jun 12th, 2008, 03:28 PM     #6
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Re: engine misfire

Quote: Originally Posted by nascar7613 View Post
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?
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?
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Old Jun 12th, 2008, 04:17 PM     #7
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Re: engine misfire

this carb does not have the drain screw
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Old Jun 12th, 2008, 04:18 PM     #8
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Re: engine misfire

Are you looking from the opposite side of the bike than the carb and between the cylinders at the back of the carb?
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Old Jun 12th, 2008, 04:24 PM     #9
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Re: engine misfire

yes I am, there is no screw that I can see
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Old Jun 12th, 2008, 06:22 PM     #10
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Re: engine misfire

Look again

Most of them have it.
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