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Your engine passes a much higher volume of air with no corresponding increase of fuel causing a lean condition.

Carburated bikes require larger jets / tuning. If Injected, you can get a download from harley, or add components that 'spoof' the stock control unit into running richer, or an aftermarket control unit you can upload files yourself.

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11y ago
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Q: What causes excessive backfire or blow back on deceleration on a 01 FXD w with a stage two kit?
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