Spark on bottom cylinder completely dead from time to time. Discovered with timing light today. Next step which part of the ignition system is likely to be faulty. The coils have been swapped and ruled out.<br />The motor is a 1984 mercury 6HP 2 cyl 2 stroke. I think the igmition system is CDI...
The engine starts fine, runs fine at full throttle for 5 minutes, then the bottom cylinder drops out. Running like this for five minutes or so suddenly (and I mean at the click of a finger)jumps back into full power running on both clylners. This usually happens twice (sometimes more) and then...
