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you need to clean out the carburetor, the gas isn't getting through it. the bogging is caused by all the gas going into the engine cause of the choke, it dumps raw fuel into the engine and cant burn it all, there fore bogging and acting sluggish, the back firing is caused by the same thing, too much fuel going into the engine and being deposited in the pipe and igniting occasionally, clean the carb out and it will run fine
It sounds like you have a reed problem they should be in a "cage" just behind the carbs on the cylinder and if they were missing a piece or if they were cracked it would cause the engine to backfire. If they are in good condition they should close against the cage and stop the back pressure coming through the carbs.
Sounds like you may have to do a complete carburetor cleaning. Also, after this is done, be sure to put the breather box back and that includes the box cover. That bike is not worth a fiddlers, ..... without that cover put back on it. If the carburetor cleaning is not done properly then you'll still have the problem. Also, be careful when taking the carbs apart, they have different size jets in them and don't move anything in regards to linkages. Those carbs are also syncronized.
If that don't do it, then maybe, you'll need your valve clearances adjusted.
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.
Just had same problem. Take carbs off and clean all jets and bowl. Be carful front and rear carb have different sized jets. When you put quad back together put entire airbox together even the cover. This quad will backfire unless air box is complete. I bet you anything your carb is full of trash.