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If you are lucky, you might just need new fuel filter and the fuel bowl cleaned out, and maybe new air filter. If not so lucky you need carburetor rebuilt. Backfire is usaully caused by engine running too lean ( too much air for the amount of fuel present). Fuel bowls get gunk in them and the fuel needles and fuel jets get varnished up. The accelerator pump gets worn out gaskets and/or bellows and doesn't give the right amount of fuel mist when you accelerate.
Full Choke is indicative of a motor starved for fuel
You need three things to make any gas engine run, in this order double check make sure you have proper timing set, spark and fuel. Could be bad gas or a bad ground from motor to frame.
Fill it up with premium gas, change the plugs, and run some sea foam through it. It will blow smoke after you add the sea foam and then clear up. That helps keep the varnish out of the carb (and unstick the choke etc.) and the high test gas will make it a lot easier to start and keep the plugs from fouling out as often. Also change/clean the air filter. This will give you optimal conditions for fuel air mixture and combustion. If you still have problems, go from there.
The spark plug is on the left side (shifter) of the head,,..?/ this is August.. if the atv has been sitting the carb may need a qualified professional to clean it again.. Replace the spark plug before you squirt anything in the engine...
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