carb butterflys to open together so all cylnders work the same, and has the biggest effect at idle. Backfire can be an air leak on the inlets or exhausts gaskets, too lean a mixture or maybe the plugs
...carb adjustment, fuel air mixture or sync Could be a combo of all. Replace your spark plugs sync carbs, and run it to see how it responds before you mess with the mixtures. Also check for any vacuum ...
Question about 1998 VZ 800 Marauder
...vz 800 removed baffles from pipes added aftermarket air cleaners and re-jetted bike took it on a ride and it breaks up at about 70 mph so synced the carbs got adjusted both gauges read around 11 ...
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