One of the sure fire ways to know if gas is bad is if it smells like lacquer... because that's what it's turning in to.
I suspect you have a fuel delivery problem, not bad gas.
If there was bad gas in the tank and carb, it could have gunked up (that's a scientific term) the holes to the main jet, or the screen in the settling bulb, or the float needle valve is stuck.
It's best to do the following with the carb off the engine, but if you're careful and have enough space, you can do it without removing the carb...
Start by getting a coffee can or something to catch some gas in, and pull the fuel line at the carb. If gas runs out, the problem is in the carb.
Carefully remove the nut on the bottom of the carb. It is generally brass and can strip or distort so use the right size wrench. Some gas will likely come out when you remove the bowl so be prepared to catch it.
The bottom nut may be full of crud, and may have holes coming in from the sides that are plugged. DON'T use a nail, dental pick, etc. to clean the holes as you can make them too large and mess up your carburetor.
Spray with carb cleaner, or better yet, soak it in carb cleaner for several minutes. Take a piece of stranded 12 ga wire and strip about 1/2" from the end. Use the individual strands of copper to clean out the holes. Twist the strands together and put it into the center of the nut to clean out anything that's collected there. Spray liberally with carb cleaner, and blow with compressed air if you have it.
The main jet is in the center tube that's a part of the carb casting. .Spray up into it, and use the copper "brush" as per the other parts. Look carefully for any holes on the size of the center tube that may be plugged. Carefully clean them out as well.
Place a bowl under the carb body and carefully remove the hinge pin to the float. Don't put any upward or downward pressure on the float as it may change your fuel level in the bowl. CAUTION: The needle valve will either be attached with a thin spring to the float, or will drop out of it's seat so make sure you catch it in the bowl as well.
Spray cleaner into the fuel inlet... you should see liquid coming out of the needle seat.
Next, note the position of the screw slots on the idle and main adjusting screws. Screw them carefully INWARDS, counting the turns. Just seat them lightly, then screw all the way out. Use the spray tube on your can of cleaner to spray into their holes and clean them out. Blow out with compressed air of you have it.
The screw needle valve on the top may be a long brass tube with a sharp end and small holes cross ways in it... clean those holes as well.
Spray some carb cleaner on the throttle and choke plates to remove any gunk.
Now, screw the two needle valves back going all the way in--seating lightly, then backing out the number of turns your counted before you removed them.
Slip the needle valve into it's hole and put the float in place... You may need to use a small screwdriver to hold it while you slide the float hinge pin in.
Clean the bowl gasket off if it dropped down with the bowl, otherwise, clean out the bowl itself and put it back on the carb. Make sure there is a gasket between the head of the bottom nut and the bowl. Also be sure you install the bowl straight so it doesn't leak or tear the gasket.
Hook the fuel line back up and turn the fuel on. Wait a few moments, then try to start the engine. A little shot of WD40 can help it along.
That should take care of your problem.