I just took my boat out of storage, and before I put it in the water for the season, I want to fix a problem I had last year. The motor is an Evinrude 50, 2 cyl from 1972. Occasionally, when the motor is cold, it won't start; there is absolutely no spark, but there is power getting to the power pack. Eventually(sometimes a few minutes, sometimes 3 hours) it fires and runs as if it never had a problem, and will always start when the motor is warm. I can't find any bad connections or other visible problems. Could the power pack cause this? One time, when it was acting up I heated the power pack up with a heat gun, but that didn't help. Any ideas?