I have a 1979 55hp Evinrude outboard, Model# 5597C , Ser# E0007192 . The starter gear keeps skipping a tooth on the flywheel when it engages. When the starter doesn't mesh into the flywheel, it causes a jam and the flywheel has to be turned in order to fix this problem. This problem may happen 5 out of 10 attempts to start. By the way, the motor is in neutral as should to start the outboard. My question is, Is it just the drive gear on the starter that is bad or should the whole assembly be replaced?