Vulcan 1993 750 backfire issue everytime i let off

FAULTY SPARK EITHER PLUG WIRE PISTON OR CLOGGED CARB OR NEEDS TO BE ADJUSTED

Check your coil and the cdi, sounds like they may be overheating and shutting down. Also check for possible vapor lock.

Now's the overdue time to stabilize your fuel, Buddy!

Hi,,sounds like you might have a tight valve,,check your valve clearances.

check to make sure you didn't get bad gas some where is it a cali model be couse your carbs can over flow and you will never know it just all goes into the charcoal canister in the front bottom of the radiator is allow raw gas to enter in the air side of the carb un metered

You have stock exhaust? If not, that's your cause.

Replaced old gas then i am assuming the bike was not used for some length of time? If you have old gas in the tank and the bike was not used the gas in the carbs would have gummed up the jets in the carb or carbs.
sounds like its time for the carbs to be cleaned.

You need to remove the carbs and dismantle them completly and adjust them to spec. Also change the fuel filter.

lean gas mixture. or the valve timing is off, but probably both. A lean mix will run really hot and allow for secondary combustion in the pipes (backfire) when the valves let even a bit of uncombusted gas through. My guess is that the bike hasn't had the carbs cleaned out thoroughly in a while. Run a half can of Sea Foam with your full tank of gas to help clean out the carbs, but really you should take them apart and dip them to clean everything out. Also you could adjust your pilot screw settings to make it run a bit more rich, but then you are just compensating for the dirty carbs. That's just my guess.