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I have a 2002 shadow spirit 750 that backfires in the rear cylinder only on both accel and decel at between 1800 &2000 rpm. Carb is set properly, plugs are tan. Coils plugs and wires are good. No exhaust or intake leaks. Could a faulty iginition pickup or ignition pulse generator cause this?
 

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I have a 2002 shadow spirit 750 that backfires in the rear cylinder only on both accel and decel at between 1800 &2000 rpm. Carb is set properly, plugs are tan. Coils plugs and wires are good. No exhaust or intake leaks. Could a faulty iginition pickup or ignition pulse generator cause this?
I just had a similair problem.. my float seemed to be stuck. What i did (might not fix your problem), is open the drain screw on the affected carb and let some fuel out. My problem was popping/backfire when at a constant speed. acceleration got rid of the pop/backfire until i got back to a steady speed.
 

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I would double check your intake. Check the carb boots to make sure the clamps are tight. If it was ignition it would probably effect the whole RPM range.
 
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