Yamaha F6B Owner's Manual download pdf (Page 46)

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EMU01298

Mounting Height

To run your boat at optimum efficiency, the

water-resistance (drag) of the boat and out-

board motor must be made as little as possi-

ble. The mounting-height of the outboard

motor greatly affects the water-resistance. If

the mounting-height is too high, cavitation

tends to occur, thus reducing the propulsion;

and if the propeller tips cut the air, the

engine speed will rise abnormally and cause

the engine to overheat. If the mounting-

height is too low, the water-resistance will

increase and thereby reduce engine effi-

ciency. Mount the engine so that the anti-

cavitation plate is between the bottom of the

boat and a level 25 mm (1 in.) below it.

NOTE:

●

The optimum mounting height of the out-

board motor is affected by the boat/motor

combination and the desired use. Test

runs at different heights can help deter-

mine the optimum mounting height.

●

Refer to the section “TRIMMING OUT-

BOARD MOTOR” for instructions on set-

ting the trim angle of the outboard.

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Yamaha F6B Owner's Manual Page 46