Just a heads up — if you believe one coil is bad, it would be reasonable to replace them both. (I would hang on to them unless the casings are cracked and breaking up. Do a search here on coil testing, as there is some testing you can do with a multimeter.)
If it were me, I would replace coils, points, condensers and wires at the same time — also the boots if they are dried and cracking. Confirm strong spark, then move on to other systems if needed. If the motor is new to you, you need to replace the impeller as a priority. (The powerhead needs to come off to access the shift rod connector, but not a difficult job.)
