Maaaate!
Few variables... but if it previously started easily and ran well, and all that has changed is that time has passed you have most likely got..
a) stale fuel in the carb bowl, or b) a gummed up pilot jet, or c) both..
Take the tank off, take the cap off the carb and the slide/needle out, loosen the clamps each side and turn the carb body to give access to the bowl nut 14mm. Back it out, old fuel will come out. Pull the main jet and pilot and inspect.. clean and replace.
My starting procedure is as follows.
Fuel on, choke on, turn the engine over slowly a couple times.. stopping on TDC. No throttle and a firm kick through. It will fire.. and I will then modulate the choke and throttle while it comes up to temp and will run with the choke off.
Good baseline jetting specs help.. but odds are the pilot is just gummed up.
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