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03 fatboy have been having problems with the bike taking too long to warm up.. it will bog down and backfire through the aircleaner until after about 2o minutes of riding. I just changed the plugs to see if that would help but it did not. dont know if it is bad gas or what? anyone have ideas

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Might be time for camchain followers 20 to 35000 miles usually not hard to check

Posted on Dec 31, 2009


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1997 FatBoy backfires through the carberator.New carb.

Carburator backfires are almost always due to a lean condition. Check your intake manifold for air leak. Star the bike, warm it up and let it idle on the kickstand. From the air breather side spray a bit of wd40 onto the intake manifold (one side at a time) and listen for the idle to pick up. If it does, you're sucking air around the intake. This should be fixed right away as it will just get worse and could result in burned valves. If this is not the case then check the main jet in your carb and get one that is richer. Trial and error is the only way to determine the best jet for your bike.

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I have a 2003 Fatboy that has an unusual idle.

Hello Jim...
Ok, the ignition is stock...
**Have you removed the ignition cover and looked at the ignition sensor? Is resin dripping down the plate? IF so, replace the sensor, but that may or may not rectify this problem.

**YOU CAN Also remove the sensor plate and clean/inspect the pickups on the back of the sensor plate. Be sure to mark/scribe the plate prior to removal so you are back to the same timing.

**Also, check to make sure the

I also need to ask, -does your bike BACKFIRE upon Acceleration?
-does it BACKFIRE upon Deceleration?

And your idle should be set at approx. 950 rpm.

Let me know if the above has been helpful Jim...

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97 jimmy

Have you replaced your O2 sensor? If not, try that.

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