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Start with the basics. Engines need compression, fuel/air in the right proportions, and spark at the right time to run. My regular started this spring on the 2nd pull after sitting all winter, & the only time I've ever had trouble getting it to start was when the magneto had gotten wet. One pull with it choked then one or two pulls with 1/2 choke almost always starts it. If you're hand cranking, you should be able to feel the cylinder come up on compression. Bring the engine around to where you feel it start to come up on compression, then quickly pull it through compression. You should be able to feel the difference if one cylinder has low compression from a stuck valve. Check the timing and the impluse on the magneto. The impulse should trip just after top dead center (it'll kick back if the magneto trips too soon). It'll be hard to start if the impulse is tripping too late. How did you verify a good spark? Make sure you don't have flakey spark plug wires (and no resistor type spark plug wires). If its still not running, that only leaves fuel. If its flooded you should be able to smell the gas fumes coming out of the exhaust, although I'm not sure how you could get it flooded in a couple pulls on the crank. Have you tried priming it with a little gas squirted in the air intake instead of choking it? A lot of aerosol carburetor cleaners are mostly propane (amazing what you learn by reading the label), and in my experience make good starting fluid for a gas engine. Propane isn't nearly as hard on an engine as ether. BE CAREFUL, TRY THIS AT YOUR OWN RISK, PROPANE IS EXTREMELY FLAMABLE. Instead of choking it, squirt a little carb cleaner in the carburetor air inlet & give it a couple pulls. If if fires, you have a fuel problem. Good luck, Keith
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