I have done several of these coils substations and have experienced this more than once. What I think may cause this is the flow electrons in the laminates is being changed. They need to get back in alignment. North & South. Similar to polarizing the generator that cars had before they went to alternators. Its faster if you can use a drill but you can get it done just pulling it over. Take the plugs out so its easy to pull over and ground the plug wires to the motor. You may have spark by now from pulling it over if you have continued testing for spark.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
