It's hard to say without more info, such as whether the engine is turning over, whether it seems to be spinning normally or is it abnormally fast. It would also be nice if the sellers told you how long it's been sitting and whether it ran the last time they tried to use it. Plus it'd help to know the model number of the tractor and make/horsepower of the engine, especially if it's something complicated and the real experts on this forum need to reply. Anyway, for starters, if the engine is turning over but not firing, the first thing you need to do is determine whether it's a fuel or ignition problem. And, probably the quickest way to do that is to squirt a puff of starting fluid or a splash of gasoline into the spark plug hole, quickly reinsert the plug and reconnect the wire, then try to start it. If it fires off for a second or two, then dies, it's fuel - probably a gummed up carb. If it has been sitting for very long, varnished fuel in the carb is a very likely culprit. I was going to haul one to the scrapyard for a friend last fall when I decided to reincarnate it. It had been sitting for several years and wound up having a bad ignition coil and needing a carb rebuild. Hopefully you'll get off a little easier. Of course, one final possibility is a malfunctioning safety switch in the seat clutch/brake, or the blade engagement mechanism. Someone correct me if I'm wrong, but if one of those are bad you'll usually get nothing when you turn the key. If it's turning over, then it's usually a fuel or ignition issue..... Good luck!!
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