I have a 96' Suzuki 55/35 jet outboard and for some odd reason the middle cylinder is not getting spark. I noticed a 1/2" long crack in the spark plug boot. Could that be the reason the cylinder is not getting spark. I have changed all 3 spark plugs and the plug going to the center cylinder is still clean as a whistle after running the engine. I'm no where near a marine mechanic and need some good input. Any ideas?