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Have you changed the fuel out, bad gas can cause this, also fuel lines and filter should be replaced as the ethanol eats the lines and filter.
Those hoses sound like the vents for the tank and carb.
When you replaced carb did you tighten the rubber boot that mounts the carb to the engine? if there is a crack in this boot it will suck air and cause this engine to stall,
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
Remove the seat, and take the cover off the air filter container. Place your hand over the end to aid in fuel flow to the carburator. You might not be getting enough fuel which is causing it to backfire and not start completely.
Attempt to start the ATV once you get fuel flowing you should be all set. Clean that filter as well.
Dirt inside the fuel line, pump, or needs a new fuel filter. Always happens when you run out and suck fumes/dirt into it. Worst case, the needle pin or gasket on the carburetor has damage. Make sure you have a good air filter with this heat, and time of year to prevent vaper lock.
is it running out of gas? backfire is caused by a lean condition. I'd check the fuel path from the tank to the carb and clean the carbs. could have something floating around in there occasionally blocking fuel flow.