1972 50 Hp was not running(no spark). Cleaned connections still no spark. Smacked the power pack and voila spark was back. Let the motor sit for a few months and now no spark again. Smacked the power pack this time to no avail. Fair conclusion the power pack is bad? Have others had the same results when whacking the power pack on their no spark problems? I noticed Faztbullets suggestion on a previous post to smack the pack, not to hard with a mallet.
