Yamaha F75 Owner's Manual

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Specifications and requirements17EMU36360Fuel requirementsEMU36780GasolineUse a good quality gasoline that meets theminimum octane rating. If knocking or pingingoccurs, use a different brand of gasoline orpremium unleaded fuel. Yamaha recomendsthat you use alcohol-free (see Gasohol) gas-oline whenever possible.NOTICEECM01980 Do not use leaded gasoline. Leaded gas-oline can seriously damage the engine. Avoid getting water and contaminants inthe fuel tank. Contaminated fuel cancause poor performance or engine dam-age. Use only fresh gasoline that hasbeen stored in clean containers.GasoholThere are two types of gasohol: gasohol con-taining ethanol (E10) and that containingmethanol. Ethanol can be used if the ethanolcontent does not exceed 10% and the fuelmeets the minimum octane ratings. E85 is afuel containing 85% ethanol and must not beused in your outboard motor. All ethanolblends containing more than 10% ethanol cancause fuel system damage or cause enginestarting and running problems. Yamaha doesnot recommend gasohol containing methanolbecause it can cause fuel system damage orengine performance problems.It is recommended that you install a water-separating marine fuel filter assembly (10 mi-cron minimum) between your boat’s fuel tankand outboard motor when using ethanol. Eth-anol is known to allow moisture to be ab-sorbed into boat fuel tanks and systems.Moisture in the fuel can cause corrosion ofmetallic fuel system components, starting andrunning complaints and require additional fuelsystem maintenance.EMU27270Ring Free Fuel AdditiveGasoline is a precise blend of many differentsubstances, each chosen to give certain char-acteristics. Gasoline blends have beenchanging in recent years in response to con-cerns about pollution and resulting emissionsregulations. One of the most obvious changeshas been the elimination of lead from most fu-els.As gasoline has changed, the amount of addi-tives such as aromatics and oxygenates hasincreased. These additives are important forthe engines in passenger cars, but they canhave detrimental effects in marine engines,because of increased deposits in the combus-tion chamber. When enough deposits collect,piston rings begin sticking. Performancedrops and engine wear increases dramatical-ly.While many additives available may reducedeposits, Yamaha recommends the use ofRing Free Fuel Additive, available from yourYamaha dealer. Ring Free Fuel Additivehas repeatedly proven its ability to clean com-bustion deposits from inside the engine, nota-bly the critical piston-ring-land area, and fuelsystem components. Follow product labelingfor use instructions.EMU36880Muddy or acidic waterYamaha strongly recommends that you haveyour dealer install the optional chromium-plat-ed water pump kit if you use the outboard mo-Recommended gasoline:Regular unleaded gasoline with a mini-mum Octane rating of 86 (Pump Oc-tane Number) = (R+M)/2©2019 Yamaha Motor Corporation, U.S.A.