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There are 3 main things that are likely to be the problem. (1) Do this first because it's easiest. Get yourself a large (gallon) can and remove the plug from the bottom of the carb, catching the gas in the can. If you can fill the can 3/4 or more with a strong flow of gas that doesn't reduce to a trickle, then you haven't got a gas flow problem (although you MIGHT have an internal problem in the carb - less likely). (2) Find an old spark plug, open its gap to extra-wide, attach one of your plug wires to it, lay it on the head, and crank. You should see a STRONG BLUE spark. If you do, you have eliminated 99 percent of the possible ignition problems, the other percent being mis-timing (unlikely). (3) And, do this after the other two- buy or borrow a compression tester. Remove all 4 spark plugs, and test the compression in each cylinder while cranking through at least a couple of compression strokes for each. The readings should be reasonably close to each other, and be over at least 60 or 70 pounds. If not, you probably have sticking valves. To recap - (fuel) + (spark) + (compression) = 99% certainly a running engine.
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