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I am assuming you are just trying to make sure the electric starter works ok. You could just use some made up cables/jumper cables to wire the starter direct and try it…
Does the engine include the boat wiring harness and junction box? If not, you will have to make up a new wiring harness and rig up a solenoid in the engine pan somewhere.
Please be sure to check compression, look for signs of overheat, and change/check the gear lube to look for signs of water. You will need to service the ignition/fuel systems, and change the water pump impeller regardless of how the engine seems to run in order to make this a reliable daily runner. Be sure to check the inside of the pressure tank as well, it is useless if rusted/gummed up inside.