Just purchased this boat and Motor, and was told by the prior owner you had to purge the water jackets prior to starting or else it would not start. The water pump output back of the motor below the cowling output has a 13/16 plastic plug was told to screw a water hose into that or else the motor would not start. I've had a lot of boats and motors and have never heard of this. Just checking to see if anyone else has to do this also