The Spark plug gap should be 0.030" – the breaker point gap should be 0.020" – and with those settings the spark should jump a 0.25" air gap (or 7 mm) minimum. That 5 horse is a low compression outboard. That was pretty much the standard until OMC went to electronic ignition for the higher compression motors with electric starting. You don’t want to crank one of those by hand. . . 🙂
