Installation

EMU41212

Installation

The information presented in this section is intended as reference only. It is not possible to provide complete instructions for every possible boat and outboard motor combination. Proper mounting depends in part on experience and the specific boat and outboard motor combination.

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WARNING

●Overpowering a boat could cause se- vere instability. Do not mount an out- board motor with more horsepower than the maximum rating on the capacity plate of the boat. If the boat does not have a capacity plate, consult the boat manufacturer.

●Improper mounting of the outboard mo- tor could result in hazardous conditions, such as poor handling, loss of control, or fire hazards. Have your Yamaha deal- er mount the outboard motor properly.

EMU41270

Mounting the outboard motor

The outboard motor should be mounted so that the boat is well balanced. Otherwise, the boat could be hard to steer. Mount the outboard motor on the centerline (keel line) of the boat.

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1. Center line (keel line)

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Mounting height

The mounting height of your outboard motor affects its efficiency and reliability. If it is mounted too high, propeller ventilation may occur, which will reduce propulsion due to excessive propeller slip, and the cooling water inlet for the cooling system may not get adequate water supply, which can cause engine overheating. If the engine is mounted too low, water resistance (drag) will increase, thereby reducing engine efficiency and performance. The optimum mounting height depends on the combination of the boat and outboard mo- tor. Consult your Yamaha dealer or boat manufacturer for further information on determining the proper mounting height.

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NOTICE

●Make sure that the idle hole is high enough to prevent water from entering the engine even if the boat is stationary with the maximum load.

●Incorrect engine height or obstructions to the smooth flow of water (such as the design or condition of the boat, or ac- cessories, such as transom ladders or depth finder transducers) can create air- borne water spray while the boat is cruising. If the outboard motor is operat- ed continuously in the presence of air- borne water spray, enough water could enter the engine through the air intake opening in the top cowling to cause se- vere engine damage. Remove the cause of the airborne water spray.

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