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That's an overflow drain, really. Not picking on you specifically here, but it just baffles me how so few people know even the most basic troubleshooting techniques for a simple 4-stroke gasoline engine... Air, fuel, and fire at the right time. Suck, squeeze, bang, blow... They're not that complicated, yet so many people just stand there and scratch their heads, or check useless stuff like oil, coolant, muffler bearings... Air is generally a gimmee. It takes a lot for the air passage to get plugged, and odds are if the tractor ran fine yesterday, the airway ain't blocked. Timing is also usually a gimmee, if you shut the tractor off because you were done using it. All bets are off if the tractor went "BANG!" and suddenly quit, though. You'd have mentioned that in your post, though, RIGHT? (There have been cases where people have failed to mention OBVIOUS physical damage, i.e. a rod sticking through the side of the crankcase...) Fire is the next thing to check. Magneto or distributor? If you pull the coil wire off at the distributor cap, hold it 3/8" from the frame, and have someone crank the tractor over, does a hot blue spark jump the gap? If not, you have no fire. Fuel is the last thing. Carbs get stuck sitting overnight, and like Hugh said, you may need a carb kit. Then again, the gas draining may be a result of you cranking and cranking and cranking and cranking with the choke pulled. That sucks lots of gas into the intake, and it will run out the overflow. Anyway, if it doesn't fire within the first few cranks, cranking on it more ain't gonna make it start. GET OFF the tractor and start troubleshooting.
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