Went through this motor 2 years ago. Just took it out for the first time yesterday and it ran great. Purred like a kitten. But, on a 16ft Jon, I could only go 5.5 mph. This morning that I took the top off and checked and I have no spark to the top cylinder. A buddy of mine who is an auto mechanic had me swap the coils and retry and I still had only spark on the bottom cylinder. He then had me swap the capacitors and same thing only spark on the bottom cylinder. I changed out the top spark plug wire as well with a new one and still no spark on the top cylinder. What can possibly be causing this? I think points are the only thing left. I've gotta be missing something.