I have a 62 Evinrude 5.5 Fisherman. I recently began having trouble getting one of the cylinders to fire, it would start up on one cylinder then the second one would kick in after revving the motor in neutral for a bit. After the 2nd cylinder started the motor ran fine at speed and at idle. I bought the motor used about 7 months ago & it ran great when I bought it. I removed the flywheel to install new coils, points & condensers & discovered cracked insulation on one of the plug wires. The ignition area also has some oil in it. The Clymer manual says possible main bearing seal leakage requiring powerhead removal & disassembly to change the seal, a much scarier job than I was looking forward to. First Question: after I replace the ignition parts is it likely the oil would interfere very much with the spark?<br /><br />When the engine runs I can see very small bits of oil/water foam coming from under water. They rise to the surface then dissipate. Second question: If a compression check is good, could an oil rich mixture, maybe 16:1 or 20:1 cause this? I tend to run the engine slightly rich on oil.