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Well, there are a bunch of potential problems but it seems most likely to me that your gas has gone bad and fouled your carbs and plugs.
Did you turn off the petcock and drain the carbs before letting the bike sit for a month? If not, then you've probably got gunked-up carburetors since the new fuel mixtures seem to be designed for sealed fuel-injection systems rather than carburetor systems.
Was the fuel tank either completely empty or full to the neck? If not, then your gas has lost a bunch of its 'easy starting' volitiles. A tank that's not full has lots of surface area for the volatiles to evaporate.
A half-full tank is also an invitation for condensation, so you could have some water in the mix too.
As a starting point, I'd drain the carbs and fuel tank and put in a gallon of FRESH premium gasoline. Second, I'd pull the sparkplugs and clean them. (Brake cleaner and a tooth brush works for fuel residue and soft carbon.)
If that will get the engine firing you might not have to pull the carbs and clean the jets.
If the engine will only run with the choke on, you'll have to clean the pilot jets.
Jim
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