Question about Harley Davidson FXST - FXSTI Softail standard Motorcycles

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Backfiring I have a '93 fxstc that backfires through the exhaust when cold and runs excellent when it is at running temp.

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The choke may be sticking and engine is not getting enough fuel when cold. it might be gummed up. i would suggest to remove carb, clean bowl and de-gunk it. (yellow tar)

Posted on Jul 17, 2009

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It sounds like you need a good tune-up, such as spark plugs and/or wires. They will act up when cold and when warmed by engine temperature will let the engine run smoothly again. And possibly a distributor cap/rotor.

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Being injected, the control system varies fuel quantity and does not directly regulate air flow. Therefore, having black soot on plugs tells you that there is too much fuel going into the engine. The O2 sensor tends to react to, more than control that. Missing can be the result of plug fouling. Backfire may be the result of a too rich fuel mix permitting unburned fuel to enter the hot exhaust where it re-ignites.
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There are other possible causes such as worn out injectors, but most often that won't happen in all cylinders at the same time. Do testing first, correct whatever you find and then make sure plugs are clean. If after running, the O2 sensor continues to register a fault, then replace it.
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