A waterproof floatation case is provided for an outboard motor which is suitable for use during deployment for covert operations with an inflatable motor craft. The encased propulsion unit can be mounted without the need for removing the case and the two panels of the case butterflied between the motor and watercraft to permit full operation of the motor. A 2-way valve permits suction to be drawn down on the case evacuating excess air and corrosive fluids from the encased motor.