It's usually fuel, too lean, but it can be a plug or weak spark. Try a new plug just to say you did, check the spark before putting it in.
The lines from the tank to the carb, have they been replaced? Common for the lines to deteriorate and break off inside the tank.
The carb could be gummed inside if it has been sitting. You might get lucky and get it to run by backing out the high adjustment screw. If it can be coaxed to run by partially choking, pretty good sign it's too lean. The metering diaphragm (the one over the needle valve) gets hard with age, it needs to be soft and pliable.
If the engine will start and stay running but not rev up, just makes a labored effort to keep running, check the spark screen inside the muffler.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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