Electrical trouble-shooting starts with the wiring diagram
add to that if they have copper washers; your should 'anneal' the copper to reuse them, simple step, you just heat copper until it glows, let it cool slow and it makes the copper washer softer to use a second or third timeNo problem, but when you retighten those crankcase bolts make sure to torque them to the recommended settings.
Did you buy all the Forrest Mims books too still highly recommended reading. Should be mandatory study in grade school, but first you would need to make the teachers read them.I got my first multi-meter when I was 8 or 9 from Radio Shack. I still have it. It is more reliable than the new digital unit I own. Didn't everyone learn how to use a multi-meter in first grade?
Now I wonder does the AI know how to use a multi-meter?