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Yamaha 25N User Manual

Yamaha 25N
248 pages
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20D
25N
30D
OWNER’S MANUAL
MANUEL D’UTILISATION
MANUAL DEL PROPIETARIO
6L3-28199-76
GB
F
ES
20D
25N
30D
BETRIEBSANLEITUNG
INSTRUCTIEBOEKJE
MANUALE PER IL PROPRIETARIO
6L3-28199-76
D
NL
I
6L3-9-76 Hyoshi 2/28/03 7:39 PM Page 1

Table of Contents

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Yamaha 25N Specifications

General IconGeneral
Engine Type2-Stroke
Horsepower25 hp
Starting SystemManual
Cylinder(s)2
Fuel Induction SystemCarburetor
Lubrication SystemPremix
Mixing Ratio50:1
Ignition SystemCDI
Oil CapacityN/A (premix)
Trim MethodManual
Fuel TypeGasoline
SteeringTiller
Gear Ratio2.08:1
Propeller Selection9" - 11"

Summary

Chapter 1 GENERAL INFORMATION

SAFETY INFORMATION

Essential safety precautions for operating the outboard motor and boat.

FUELING INSTRUCTIONS

Proper procedures for adding gasoline and engine oil to the motor.

START-IN-GEAR PROTECTION

Explanation of the safety feature preventing engine start in gear.

Chapter 2 BASIC COMPONENTS

OPERATIONS OF CONTROLS AND OTHER FUNCTIONS

Description and function of all controls, switches, and other operational parts.

Power Trim/Tilt Switch

Operation of the switch to adjust motor angle for optimal performance.

WARNING SYSTEM

Overview of the engine warning systems and their functions.

OVERHEAT WARNING

How the overheat warning device activates and its effects.

OIL LEVEL WARNING / OIL FILTER CLOGGING WARNING

Engine warnings for low oil level and clogged oil filter.

Chapter 3 OPERATION

INSTALLATION

Procedures and precautions for properly mounting the outboard motor on the boat.

MOUNTING THE OUTBOARD MOTOR

Guidelines for correctly installing the outboard motor on the boat's transom.

Mounting Height

Determining the optimal engine mounting height for efficiency and performance.

CLAMPING THE OUTBOARD MOTOR

Steps for securely attaching the outboard motor to the boat's transom.

FILLING FUEL AND ENGINE OIL

Instructions for safely filling the fuel tank and engine oil reservoir.

GASOLINE (PETROL) AND OIL MIXING

Correct fuel and oil mixing ratios for pre-mix models.

PRE-OPERATION CHECKS

Essential checks before starting the engine for safe operation.

OPERATION AFTER A LONG PERIOD OF STORAGE

Procedures for operating the engine after extended storage.

BREAKING IN ENGINE

Procedure for properly breaking in a new engine to ensure longevity.

STARTING ENGINE

Step-by-step guide to starting the outboard motor.

WARMING UP ENGINE

Procedure for warming up the engine before operation.

SHIFTING

How to shift gears (forward, neutral, reverse) safely and correctly.

STOPPING ENGINE

Correct procedure for shutting down the outboard motor.

TRIMMING OUTBOARD MOTOR

Adjusting the motor's angle for optimal boat performance and handling.

ADJUSTING TRIM ANGLE

Steps for adjusting the trim angle using the adjusting rod.

Chapter 4 MAINTENANCE

PERIODIC MAINTENANCE

Schedule and procedures for regular maintenance tasks.

Chapter 5 TROUBLE RECOVERY

TROUBLESHOOTING

Chart of common problems, possible causes, and remedies for the outboard motor.

TEMPORARY ACTION IN EMERGENCY

Immediate steps to take in case of specific emergencies.

STARTER WILL NOT OPERATE

Using an emergency starter rope when the starter mechanism fails.

TREATMENT OF SUBMERGED MOTOR

Procedure for handling the outboard motor if it has been submerged in water.

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