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HI Jim, good morning my name is***** you have a timing light so that we can check and see if that cylinder is sparking or not. Do you also have a model number on the outboard?
1/4 in inch would not be a large enough gap. Can you set the gap to 7/16ths of an inch and see if the spark jumps that gap?
That would be on the weak side. It really should be hot and blue, like little lightning bolts. The best way to check for spark is with a timing light. What you would want to do is get a timing light (they are only 20 bucks on amazon) and hook that light up to each plug wire one at a time, and see if the light flashes or not with the engine running. If the light does flash, then that plug is in fact firing while under a load. If the light does not flash, or is flashing eratically, then there is no spark or the coil is misfiring on that cylinder. Does that make sense.
Please bear with me as we are not having a face to face or phone conversation. What is your question about the low ohm reading specifically?
It looks like you read my answer and left without selecting a rating for my service, replying back, or simply thanking me. Was there something else?
Coils can technically be "out of spec" but still fire. The timing light is the better test to see if those coils are actually firing when under a load. Was there anything else?