Fill the gas tank that will be used to supply the Johnson outboard motor with unleaded gasoline during the break-in period. Add 2-cycle engine oil to the gasoline at a mixture of 50-to-1, which is about 2 1/2 ounces of oil for every gallon of gasoline. Slide the motor onto the boat's motor mount and secure it in place with the clamps on the motor. Place the boat in the water if it is not already. Connect the gas tank hose to the fuel supply connector on the motor.
Ensure that the Johnson outboard motor is in neutral. Start the motor by pulling on the starting rope. Once the motor has started, let it idle for 10 minutes.
Engage the motor, shifting it from neutral to drive, so that the boat is moving forward. Twist the throttle on the tiller handle of the outboard so that the motor revs faster than idle but less than half throttle. Run the Johnson outboard at this speed for 60 minutes.
Increase the speed of the motor so that it operates at less than three-quarters throttle but more than half throttle. Run the Johnson outboard at this speed for 60 minutes.
Increase the speed of the motor, but avoid full throttle. Run the Johnson outboard, periodically varying the speed, between three-quarters throttle and full throttle, for 60 minutes.
