I'm not sure what the exhaust system is you have put on your bike, but the chances are it is less restrictive than standard, so the back firing is more likely to be the engine running lean on over-run. I have just bought a 2006 model, I suspect the motor is strangled by all the emission gubbins, so am expecting the same problem myself shortly!
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Harley Davidsons,
The most effective way of turning petrol into noise without the side-effect of horsepower
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