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Rotate the engine to #1 firing postion (TDC of the firing stroke) by removing the #1 spark plug, holding a finger OVER the hole while someone slowly cranks it by hand, until you feel air pushing out. Continue to turn it until the flywheel timing marks line up. Then, mount the mag in a vise, (CAREFULLY, so as not to damge it- I clamp the bottom of the mounting flange in a vise with soft jaws, so no pressure is placed on the main part of the mag), and clamp a Vise Grip to one of the drive lugs. Connect a grounded test spark plug to the mag's terminal marked "1". Using the Vise Grip, rotate the mag drive in the normal direction of rotation. The impulse will "snap" every 1/2 turn. (Assuming the mag works), at one of the "snap" positions, the test spark plug connected to #1 terminal in the cap will spark. At that point, rotate the mag BACKWARDS... ONLY ENOUGH 'til the drive lugs are horizontal (- -) (only a fraction of a turn), and install it on the tractor. (The mag drive slots on the engine should be horizontal (- -) , also, if the drive is timed correctly, and the engine is at #1 TDC.) Then, arrange the wires around the cap in a CW direction (looking at the cap) in firing order, starting with the terminal marked #1. Keep the mag "kill switch" grounded out, and slowly rotate the crankshaft exactly 2 turns, and note where the flywheel timing marks are when the inpulse "snaps". Be SURE this is not before TDC, or the tractor will be hard to start, and "kick back" against the starter, or break the arm of a person hand-cranking it. Only when you are sure the timing and firing order are correct, should the "kill switch" be placed in the "RUN" position, and an attempt made to start it. For information on repairing the mag, if needed, cut and paste the link below: http://www.cleancomputes.com/Cub/Blue%20Ribbon%20Service%20Manuals/GSS-5035%20Service%20Manual%20Magnetos/index.html
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