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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
A couple of suggestions: Make sure that the gasket seal is good between carb and engine. I had a similar problem with my Cat 500 and found that the choke was sticking. I sprayed down the carb with Gunk and made sure all moving parts were not hanging up. I also put anti fogging oil in the gas to help clean jets and ports hard to clean with a carb rebuild.