Re: Just got my first big outboard! Home › Forum › Ask A Member › Just got my first big outboard! › Re: Just got my first big outboard! 76-jReplies: 79Topics: 6 October 25, 2018 at 10:22 am #84951 Many 650 / Panther Merc’s (OEM) have the Thunderbolt Ignition, notorious for breaking the timing belt…a "fix" is to substitute a Kiekhaefer 4-D magneto, as it has less drag.