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Default Backfire

Getting a loud backfire on startup about 50% of the time.

Bike cold or hot, with or without throttle.

This has been for a while now

Otherwise runs pretty good.
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Default

2003 - Original Nosecone Ignition Module?

Maybe a loose connection somewhere?

When you're having issues with the electrical system, use this Sportsterpedia section about
checking the battery cables, voltages and grounds - DO THIS BEFORE ANYTHING ELSE:
http://sportsterpedia.com/doku.php/t...place_to_start

Then check your coil connections...


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IXL2,

Bike in my sig. dyna tech nosecone ignition.

And the motor doesn't miss otherwise

Would timing cause this?
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Default

Might be timing. But mine does it about the same. I rode rocketmangbs cannibal queen last weekend and it did it too. Both bikes are tuned well and have no known electrical problems. Me thinks it's just raw fuel lighting off I
In the pipe when lost spark fires the cylinder that is on the exhaust stroke. Maybe someone smarter than me will chime in.
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Default

And don't blip the throttle when you shut down!
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Yeh, she starts immediately-first revolution of the motor 'most ever time. Very eager
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I used to do this by priming with a few quick squirts of the throttle before starting...it was fun in the morning for the neighbors... my bike was running a little lean and I adjusted the IMS- never could get the backfire again. For me it had nothing to do with timing.
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Thinking might be waste spark. I thought it was single-fire, might be wrong
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