Yamaha 9.9F Owner's Manual

Also see for 15F: Owner's manual Owner's manual Owner's manual Owner's manual Owner's manual

Installation19EMU26902InstallationThe information presented in this section is in-tended as reference only. It is not possible toprovide complete instructions for every possi-ble boat and motor combination. Propermounting depends in part on experience andthe specific boat and motor combination.WARNINGEWM01590 Overpowering a boat could cause se-vere instability. Do not install an out-board motor with more horsepower thanthe maximum rating on the capacityplate 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 conditionssuch as poor handling, loss of control,or fire hazards. For permanently mount-ed models, your dealer or other personexperienced in proper rigging shouldmount 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-engineboats, mount the outboard motor on the cen-terline (keel line) of the boat.EMU26921Mounting 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 and alevel 25 mm (1 in.) below it.1. Center line (keel line)ZMU017601ZMU020110–25mm(0–1in.)