If you know some basic mechanics I'll assume you checked the oil, antifreeze and such. Three things to check, at least one is missing: compression, fuel, spark. I'm also assuming it's just been setting, nobody has been tinkering with timing or anything like that. A couple squirts of oil in each cylinder is a good idea too. Spark is easiest to check, pull one plug and hook the plug wire back to it, hold it next to the block and see if it sparks as the motor turns. Compression requires a tool, it screws into each spark plug hole, crank the motor with the throttle wide open until the gauge maxes out, each cylinder should be over 100 psi and all should be close to the same. If they are all low see above about oil in the cylinders. Fuel is hardest because you can't see it, and might not be able to smell it even. But if you take a can of brake cleaner or other highly flammable stuff, shoot about a 3-second spray into the carb intake, and the tractor then tries to fire, you have a fuel problem. BTW you didn't pull my favorite trick and forget to turn on the gas, did you?
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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