Just installed new CDI power pack and 2 new CDI coils to fix high speed misfire, took boat out boat ran great high speed misfire is gone and boat ran great. The next week took boat out it lost power, checked for spark and found that the lower coil has no spark on both lower cylinders. install one of the old coils that I replaced, now have spark and motor is running good. My question is did I have a coil that is defective or did the power pack burn out the coil ?? I think its odd that both sides of the coil went bad causing both lower cylinder to lose spark ? When I checked it I had RPM reading on wires coming from the power pack but no reading coming out of the plug wires. Can the power pack brun out the coils ?

