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Things like this sometimes happen after the tractor has been sitting for a few months or so. You are on the right track. After you tried to start it, what did the plugs look like? Where they wet? If not then gas isn't getting out of the carb (which is pretty common). If the plugs were wet then its possible the spark isn't happening at the right time (not common). I think your 520 is probably like my 50 in that the choke operates a spring on the carb and this in turn operates the choke plates. Take off the air intake and look at the choke plates. Do they close? You mentioned that you've got gas in the carb but is it getting fuel from the tank or is what you are seeing just some fuel left in the bottom of the bowl? The bowl should be pretty much full of gas when you pull it. Some systems (I think the 520 included) have a vacuum operated fuel shut-off that keeps gas from getting to the carb if the engine isn't running. These shut-offs can sometimes stick or develop a hole in the diaphram that keeps them from delivering fuel. If you still don't get anywhere, I'd remove the air intake to the carb and give it a shot of ether. If she fires with ether then its a fuel/carb problem. If you still don't get anywhere, make sure you are getting compression at the cylinders. If you don't then you've got stuck valves or possibly got a cam problem. This does not happen very often though. If you get a stuck valve, it usually only happens on one cylinder. Hope this gets you started (no pun intended),
John
1953 Model 50
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