Yamaha 25D Owner's Manual

Also see for 25D: Owner's manual

Contents

Operation21EMU27270Ring Free Fuel AdditiveGasoline is a precise blend of many differentsubstances, each chosen to give certaincharacteristics. Gasoline blends have beenchanging in recent years in response to con-cerns about pollution and resulting emis-sions regulations. One of the most obviouschanges has been the elimination of leadfrom most fuels.As gasoline has changed, the amount of ad-ditives such as aromatics and oxygenateshas increased. These additives are impor-tant for the engines in passenger cars, butthey can have detrimental effects in marineengines, because of increased deposits inthe combustion chamber. When enough de-posits collect, piston rings begin sticking.Performance drops and engine wear in-creases dramatically.While many additives available may reducedeposits, Yamaha recommends the use ofRing Free Fuel Additive, available fromyour Yamaha dealer. Ring Free Fuel Addi-tive has repeatedly proven its ability to cleancombustion deposits from inside the engine,notably the critical piston-ring-land area, andfuel system components. Follow product la-beling for use instructions.EMU27403Gasoline and oil mixing (100:1)If equipped with a portable fuel tank1. Pour oil into the portable fuel tank, andthen add gasoline.2. Replace the fuel tank cap and closetightly.3. Shake the fuel tank to mix the fuel thor-oughly.4. Make sure that the oil and gasoline aremixed.If equipped with a built-in fuel tank1. Pour oil into a clean fuel can, and thenadd gasoline.ZMU03012Gasoline to engineoil ratioBreak-in period See page 19After break-in 100:11. Engine oil2. Gasoline