Question about 2004 Harley Davidson FXST - FXSTI Softail standard

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Backfire through the intake at cruising speed, or idling, also backfire through exhaust when decelerating Runs fine during hard acceleration. Thought it was water in fuel, but dry gas did not solve the problem. Moisture (rain) made it worse.

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Intake:
Lean, or spark control problem, valve problem, bad fuel, plugged carburetor.

Exhaust:
excessively lean or rich with exhaust leak, valve problem, spark control problem.



Posted on Sep 28, 2009

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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.

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I also need to ask, -does your bike BACKFIRE upon Acceleration?
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And your idle should be set at approx. 950 rpm.

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


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