Yamaha 25D Owner's Manual

Also see for 25D: Owner's manual

Contents

Operation19board (if packed). For details, consultyour Yamaha dealer.WARNINGEWM00650Avoid using bolts, nuts or washers otherthan those contained in the engine pack-aging. If used, they must be of at least thesame quality of material and strength andmust be tightened securely. After tighten-ing, test run the engine and check theirtightness.EMU30172Breaking 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.CAUTION:ECM00800Failure to follow the break-in procedurecould result in reduced engine life oreven severe engine damage.EMU27050Gasoline and engine oil mixing chart(25:1)CAUTION:ECM00150Be sure to mix gasoline and oil complete-ly, otherwise the engine may be dam-aged.EMU27073Procedure for pre-mixed modelsRun the engine under load (in gear with apropeller installed) 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. Second hour: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 engine1. BoltsZMU0263711. : Gasoline2. : Engine oil