On the BN, your only timing mark is going to be the TDC mark on the flywheel. Unless the tractor's been split and cleaned up, it can be hard to find. It's a line that runs fore and aft on the flywheel, marked T-C 1-4. Turning the motor by hand (plugs out) you should be able to feel the compression on #1. Ge5 to that point and then run a stiff wire or a skinny screwdriver into the plug hole on #1 so that it rests on top of the piston. When the wire is at its lowest point the piston is at its highest, and you should, with some looking/cleaning . . . be able to find the timing mark on the flywheel by looking up through the hole on the bottom of your torque tube, which should line up with either a very nice steel indicator or a nub cast intoon the cover in front, depending on your tractor.
From there it's pretty much like the others have said. Orient your distributor so that the rotor is pointing generally to #1, which is usually in the 1-2 o'clock position, and bolt it in. From there rotate it in until you get a spark at just that point. After that it's pretty much fine tuning by ear.
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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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