Charon
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Both are correct, and both should be the same. Using the screwdriver in the spark plug hole will allow you to find TDC without removing the plug in the alternator cover, by turning the rear wheel with the bike in gear. Using the alternator mark will allow finding TDC without removing the spark plug, but you will have to move the crank slowly so engine compression doesn't push the piston back down. Slowly means allowing enough time for the pressure to leak out via the valves or rings, neither of which seal for a long time.
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