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Locate #1 TDC by removing #1 spark plug, and having someone slowly turn it over with the crank. As it comes up on TDC, you will feel air blow past your finger. At the exact point of rotation that the forcing of air stops, just before it begins to "suck' on your finger, that's TDC, which should be confirmed by a timing mark. I believe, at that point, the drive slot in the engine, where the mag plugs into, will be horizontal. Then you need to find #1 on the mag. Is there a terminal labelled "1" on your's? The mag's rotor needs to be pointing to the desired #1 terminal at this point. It is easier (because of the impulse) to turn the mag BACKWARDS to get the rotor nearest the #1 terminal. At this point, the mag drive tang will also be more or less horizontal. Install the mag. Then, with the "kill" switch activated to prevent sparking, or ANY chance of a kick-back, turn the engine over two turns, until it is again at #1 TDC. Turn very slowly, and note when the impulse snaps. It should be near TDC, NOT before, or you will risk dangerous arm-breaking kick-back when trying to start the engine. If the timing is "OFF", rotate the mag one way or the other with the bolts loosened. Verify the position of the rotor, pointing nearest the #1 terminal. Once you are satisfied the timing is near TDC, and NOT before, arrange the wires around the cap, starting with #1, in correct firing order. Be ABSOLUTELY sure the timing is not too early, before TDC, or you will risk breaking an arm when cranking it, or breaking a starter drive, if it's an electric start. If you hand-crank it, follow safe cranking instructions.
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