Yamaha F2.5A Service Manual

Also see for F25A: Service manual Owner's manual Service manual Owner's manual Owner's manual

Contents

GENINFO General information1-15 69M3E11Propeller selection 1The performance of a boat and outboardmotor will be critically affected by the sizeand type of propeller you choose. Propellersgreatly affect boat speed, acceleration,engine life, fuel economy, and even boatingand steering capabilities. An incorrect choicecould adversely affect performance andcould also seriously damage the engine.Use the following information as a guide forselecting a propeller that meets the operatingconditions of the boat and the outboardmotor.Propeller sizeThe size of the propeller is indicated on thepropeller blade.a Propeller diameter (in inches)b Propeller pitch (in inches)c Propeller type (propeller mark)SelectionWhen the engine speed is at the full throttleoperating range (5,250–5,750 r/min), theideal propeller for the boat is one that pro-vides maximum performance in relation toboat speed and fuel consumption.Predelivery checks 1To make the delivery process smooth andefficient, the predelivery checks should becompleted as explained below.Checking the fuel system1. Check that the fuel hose is securely con-nected and that the fuel tank is full withfuel.CAUTION:This is a 4-stroke engine. Never use pre-mixed fuel.Checking the gear oil1. Check the gear oil level.Propeller size (in) Material7 1/4 × 6 - BSAluminum7 1/4 × 5 1/2 - BS7 1/4 × 7 1/4 - BS7 1/4 × 8 1/4 - BS7 1/2 × 5 1/2 - BSS69J1110× -a b cS69M1040