Yamaha 20D Owner's Manual

Also see for 20D: Owner's manual Owner's manual Owner's manual Owner's manual Owner's manual

Contents

28OperationEMU36381First-time operationEMU27020Breaking in engineYour new engine requires a period of break-in to allow mating surfaces of moving parts towear in evenly. Correct break-in will help en-sure proper performance and longer enginelife.NOTICEECM00140 Failure to follow the break-in procedurecould result in reduced engine life oreven severe engine damage. Premix fuel must be used during break-in in addition to oil in the oil injectionsystem.EMU27060Gasoline and engine oil mixing chart(50:1)NOTICEECM00150Be sure to mix gasoline and oil complete-ly, otherwise the engine may be dam-aged.EMU30311Procedure for oil injection modelsRun the engine under load (in gear with apropeller installed) for 10 hours as follows.1. First 10 minutes:Run the engine at the lowest possiblespeed. A fast idle in neutral is best.2. Next 50 minutes:Do not exceed half throttle (approxi-mately 3000 r/min). Vary engine speedoccasionally. If you have an easy-plan-ing boat, accelerate at full throttle ontoplane, then immediately reduce thethrottle to 3000 r/min or less.3. Next two hours:Accelerate at full throttle onto plane,then reduce engine speed to three-quar-ter throttle (approximately 4000 r/min).Vary engine speed occasionally. Run atfull throttle for one minute, then allowabout 10 minutes of operation at three-quarter throttle or less to let the enginecool.4. Remaining seven hours:Run the engine at any speed. However,avoid operating at full throttle for morethan 5 minutes at a time.5. After the first 10 hours:Operate the engine normally. Use onlystraight gasoline in the fuel tank. TheYamaha oil injection system providesproper lubrication for normal operation.EMU36400Getting to know your boatDifferent boats handle differently. Operatecautiously while you learn how your boathandles under different conditions and withdifferent trim angles (see page 44).EMU36412Checks before starting engineWARNINGEWM01920If any item in the checks before startingengine is not working properly, have it in-spected and repaired before operatingthe outboard motor. Otherwise an acci-1. : Gasoline2. : Engine oil