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Are the plugs wet with gas after you prime the engine and try turning it over a few times? You may not be getting gas to the cylinders if you left gas in the fuel system when you put it away and it has evaporated and left behind gunk that causes the carburetor to stick or the injectors to clog. (I always use Sta-bil or a similar gas storage treatment when putting up a wet engine). Get two bottles of carburetor/injector cleaner. Put one in the gas tank to mix with the gas there. If you have access to the carburetor, pour part of the bottle of cleaner into the carburetor and work the throttle and choke back and forth a few times with the cleaner in place. Gently try moving the choke plate or float to see if they are sticking. Replace the carburetor housing and try cranking the engine several times. Otherwise, you probably need to have a mechanic look at it.
Most of the time it's because the Pilot/Idle jet is clogged in the carburetor. This most often happens because of old fuel sitting in the carburetor during long periods of sitting and non-use. The fuel forms a varnish - a gummy layer inside of your carburetor and clogs the tiny holes in the idle jet. Since fuel can't get through, the engine dies. The hole for the choke is larger, therefore the fuel can still get through it.
Check your Air Filter, clean it out, check for obvious blockages. Change the filter if it looks well used (look for excessive dust or color change on the inner part of the filter) or obvious wear.
Check for other blockages around the air filter inlet.
Check the spark plug, just change it for a new one so that eliminates that possibly.
Check your fuel filter and replace if needed.
Check the fuel tank for corrosion or dirt in the fuel. Empty it out, Clean it and add new fuel, be sure you have the correct fuel.
Check your Air / Fuel mix adjustment screws on the carburetor.