Yamaha 25D Owner's Manual

Also see for 25D: Owner's manual

Contents

General information8dry rags. Do not overfill the fuel tank. Tighten the filler cap securely after re-fueling. If you should swallow some gasoline,inhale a lot of gasoline vapor, or getgasoline in your eyes, get immediatemedical attention. If any gasoline spills onto your skin, im-mediately wash with soap and water.Change clothing if gasoline spills on it. Touch the fuel nozzle to the filler open-ing or funnel to help prevent electro-static sparks.CAUTION:ECM00010Use only new clean gasoline which hasbeen stored in clean containers and is notcontaminated with water or foreign mat-ter.EMU25570GasolineIf knocking or pinging occurs, use a differentbrand of gasoline or premium unleaded fuel.GasoholThere are two types of gasohol: gasohol con-taining ethanol and that containing metha-nol. Gasohol containing ethanol can be usedif ethanol content does not exceed 10% andthe fuel meets minimum octane ratings.Yamaha does not recommended gasoholcontaining methanol because it can causefuel system damage or engine performanceproblems.EMU25650Engine oilIf the recommended engine oil is not avail-able, another 2-stroke engine oil with anNMMA-certified TC-W3 rating may be used.EMU25741Propeller selectionThe performance of your outboard motor willbe critically affected by your choice of propel-ler, as an incorrect choice could adverselyaffect performance and could also seriouslydamage the motor. Engine speed dependson the propeller size and boat load. If enginespeed is too high or too low for good engineperformance, this will have an adverse effecton the engine.Yamaha outboard motors are fitted with pro-pellers chosen to perform well over a rangeof applications, but there may be uses wherea propeller with a different pitch would bemore appropriate. For a greater operatingload, a smaller-pitch propeller is more suit-able as it enables the correct engine speedto be maintained. Conversely, a larger-pitchpropeller is more suitable for a smaller oper-ating load.Yamaha dealers stock a range of propellers,and can advise you and install a propeller onyour outboard that is best suited to your ap-plication.Recommended gasoline:Regular unleaded gasoline with a min-imum octane rating of 86 (Pump Oc-tane Number) = (R+M)/2Recommended engine oil:YAMALUBE 2-stroke outboard motoroil