Operation 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 en- gine to overheat. If the mounting height is too low, the water resistance will increase and thereby reduce engine efficiency. Mount the outboard motor so that the anti-cavitation plate is in alignment with the bottom of the boat. life. ECM00140 CAUTION: G Failure to follow the break-in procedure could result in reduced engine life or even severe engine damage. G Premix fuel must be used during break- in in addition to oil in the oil injection system.
EMU27060 Gasoline and engine oil mixing chart (50:1) ZMU01762 1. : Gasoline NOTE: G 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. Con- sult your Yamaha dealer or boat manufacturer for further information on de- termining the proper mounting height. 2. : Engine oil ECM00150 CAUTION: Be sure to mix gasoline and oil complete- ly, otherwise the engine may be dam- aged. EMU30311 Procedure for oil injection models Run the engine under load (in gear with a propeller installed) for 10 hours as follows. 1. First 10 minutes:
Run the engine at the lowest possible speed. A fast idle in neutral is best. 2. Next 50 minutes: Do not exceed half throttle (approxi- mately 3000 r/min). Vary engine speed occasionally. If you have an easy-plan- ing boat, accelerate at full throttle onto plane, then immediately reduce the G For instructions on setting the trim angle of the outboard motor, see page 34. EMU27020 Breaking in engine Your new engine requires a period of break- in to allow mating surfaces of moving parts to wear in evenly. Correct break-in will help en- sure proper performance and longer engine 25