Fuel or Electrical
You really need to find out which it is, Fuel or electrical otherwise you will just be replacing good parts for a lot of $$ with no solution.
Take it out again with a can of carb cleaner or ether (be real carefull and keep fire extingisher handy), with engine hatch open run it till it stalls then give it a shot of carb cleaner or ether if it doesn't start you have an electrical problem.
If it is electrical you need to trace the power from the coil backwards to the ignition. I would bet on a older boat that if it's electrical it is corrosion or bad connection (assuming coil is good since you have already replaced it).
If it's fuel has the tank been drained, this ethanol crap has really caused a lot of similar problems on older boats. When was the last time the boat was used or run for a longer period of time, has it been sitting long?
Just one man's opinion
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