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I notice that the magneto plate on the motor can be moved vertically a bit by lifting at the point where the plug wires leave the plate. My Johnson RD12 is same motor but does not allow that movement as the mag plate bearing is tighter. I think that as the flywheel magnet passes each coil the plate is displaced a little because of magnetic attraction and that is the tick that I notice. The tick occurs when the magnet passes near each coil. If so, the magnet is not rubbing the coil. I also notice that when I move the coils back this effect happens although it is not as strong.
Side note – I made a 1/4" gap spark tester from wood and a couple of screws and I can that jump the gap only intermittently with either cylinder although a neon spark tester shows spark every time.
I have replaced one of my coils and put in new points. Hope I am not too far out in the weeds with this.