Propeller Selection; Propeller Size; Selection; Predelivery Checks - Yamaha F2.5A Service Manual

GEN
INFO

Propeller selection

The performance of a boat and outboard
motor will be critically affected by the size
and type of propeller you choose. Propellers
greatly affect boat speed, acceleration,
engine life, fuel economy, and even boating
and steering capabilities. An incorrect choice
could adversely affect performance and
could also seriously damage the engine.
Use the following information as a guide for
selecting a propeller that meets the operating
conditions of the boat and the outboard
motor.

Propeller size

The size of the propeller is indicated on the
propeller blade.
×
-
a b c
a Propeller diameter (in inches)
b Propeller pitch (in inches)
c Propeller type (propeller mark)

Selection

When the engine speed is at the full throttle
operating range (5,250–5,750 r/min), the
ideal propeller for the boat is one that pro-
vides maximum performance in relation to
boat speed and fuel consumption.
Propeller size (in)
7 1/4 × 6 - BS
7 1/4 × 5 1/2 - BS
7 1/4 × 7 1/4 - BS
7 1/4 × 8 1/4 - BS
7 1/2 × 5 1/2 - BS
1-15
General information
S69J1110
Material
Aluminum

Predelivery checks

1
To make the delivery process smooth and
efficient, the predelivery checks should be
completed as explained below.

Checking the fuel system

1. Check that the fuel hose is securely con-
nected and that the fuel tank is full with
fuel.
CAUTION:
This is a 4-stroke engine. Never use pre-
mixed fuel.

Checking the gear oil

1. Check the gear oil level.
1
S69M1040
69M3E11