Your local library is a good source for outboard repair manuals including the wiring diagrams. Most libraries now are on a network with area or Statewide libraries and books can be sent directly to you.
How do I remove the lower unit from my 1984 50 hp. Mercury outboard motor?
The service manual is located at the related link below.
The best solution is the find a service manual for that motor. I have seen these in libraries and they are for sale on the internet.
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55 hp.
The 15 horsepower Mercury outboard motor does not have a water pump. The outboard motor is air cooled and does not have a need for circulating water.
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The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"