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AmazonThis video talks about the basic principles of ignition timing and then goes on to give an example of setting the ignition timing on a Tohatsu 15HP two stroke outboard.
The timing can also be thrown out by the flywheel. On this outboard the woodruff key that locates the flywheel on the crankshaft had sheared, so the flywheel could turn on the crankshaft, and the timing was so far out it wouldn't start.
Setting the idle timing with a timing light, on a Yamaha 20HP two stroke.