Yamaha 20D Owner's Manual

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Contents

25InstallationEMU26902InstallationThe information presented in this section isintended as reference only. It is not possibleto provide complete instructions for everypossible boat and motor combination. Prop-er mounting depends in part on experienceand the specific boat and motor combination.WARNINGEWM01590 Overpowering a boat could cause se-vere instability. Do not install an out-board motor with more horsepowerthan the maximum rating on the capac-ity plate of the boat. If the boat does nothave a capacity plate, consult the boatmanufacturer. Improper mounting of the outboard mo-tor could result in hazardous condi-tions such as poor handling, loss ofcontrol, or fire hazards. For permanent-ly mounted models, your dealer or oth-er person experienced in properrigging should mount the motor.EMU26911Mounting the outboard motorWARNINGEWM01720Your dealer or other person experiencedin proper outboard motor mountingshould show you how to mount your out-board motor.The outboard motor should be mounted sothat the boat is well balanced. Otherwise, theboat could be hard to steer. For single-en-gine boats, mount the outboard motor on thecenterline (keel line) of the boat.EMU26923Mounting heightTo run your boat at optimum efficiency, thewater resistance (drag) of the boat and out-board motor must be made as little as possi-ble. The mounting height of the outboardmotor greatly affects the water resistance. Ifthe mounting height is too high, cavitationtends to occur, thus reducing the propulsion;and if the propeller tips cut the air, the enginespeed will rise abnormally and cause the en-gine to overheat. If the mounting height is toolow, the water resistance will increase andthereby reduce engine efficiency. Mount theoutboard motor so that the anti-cavitationplate is between the bottom of the boat anda level 25 mm (1 in) below it.1. Center line (keel line)ZMU017601