I believe the motor is a 1978 model. It's a 225 crossflow. The operator said it shut off suddenly as he powered up coming out of a no wake zone. It has no spark. It has a vented flywheel and the magnent(s) appear to be cracked/compromised in some way, possibly pieces missing. Is this a common problem with the 35 amp alternator/magneto units? Just looking for ideas or insight before getting into it - Mike