Motors made in this century have convenient flushing ports to connect a freshwater hose and flush the motor when it is NOT running. Most people has quick connect fittings to make it really easy. I always flush my motors.
Your outboard MUST have an anode (zinc or aluminum) bolted to the bottom of the motor mount. They all do.
Often they have some internal to the head.
If you don't paint, you will have trouble getting on plane by August...
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