Re: How Important is OMC Ignition Timing?

[Anonymous]

Timing of the spark is only a range relative to TDC.

The timing of points opening ("event #1") is a fixed relationship between the coil "shoe" and the position of the magnet (which has a fixed relationship to the high point on the cam, since both the flywheel and the cam are keyed onto the crankshaft. This is why you can adjust the points at any throttle setting.

Timing of the spark relative to TDC at a given throttle position (& carb butterfly position) controlled by the "link and sync" adjustment cam.