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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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