Ran boat,went fishing,started boat 8 different times that day,no problem,ran great.1 week later go back and cannot get boat started,no spark,have replaced plugs,points,condensor,rotor,ignition coil,still no spark,not sure how something goes wrong when boat ran good,docked boat fine.1987 Omc Cobra 5 liter,need help please,I'm not a mechanic,but I know some stuff and I replaced what I mentioned earlier,thanks