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In order to meet epa gas mileage requirements manufacturers have bikes running lean & hot. Also there is a valve that feeds some fuel back into the exhaust. Hence your bike backfires on deceleration and sometimes when starting and who knows when else. Without going into a political rant, here's what you can do.

There are kits you can purchase to disable the valve, combined with the addition of a fuel injection controller to richen the fuel air mixture - backfiring will disappear like magic. Check into it.

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14y ago

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