Yamaha F25G User Manual (English)

nicholas54Jul 29, 2025

Why is my Yamaha F25G vibrating excessively?

R
rmoonJul 29, 2025
If your Yamaha Outboard Motor is vibrating excessively, it might be due to several reasons. First, check the propeller for any signs of damage and have it repaired or replaced if necessary. Also, inspect the propeller for weeds or foreign material and clean it. If the propeller shaft is damaged or the steering pivot is loose or damaged, have it serviced by a Yamaha dealer. Finally, make sure that the outboard motor mounting bolts are tightened; if they are loose, tighten them or have a Yamaha dealer service them.

Brand	Yamaha
Model	F25G
Category	Outboard Motor
Language	English

Brand

Yamaha

Model

F25G

Safety Information for Outboard Motor Operation

Outboard Motor Safety Precautions

Essential safety measures for operating the outboard motor, covering propeller, rotating parts, hot parts, and electric shock hazards.

Power Trim and Tilt Safety

Precautions for safe operation of the power trim and tilt mechanism to avoid crushing injuries.

Engine Shut-Off Cord Safety

Importance and proper use of the engine shut-off cord to prevent runaway boats.

Fuel and Carbon Monoxide Safety

Precautions for handling gasoline and awareness of carbon monoxide hazards from exhaust gases.

Boating Safety Practices

General safety measures for boating, including alcohol, PFDs, and passenger awareness.

Collision Avoidance and Overloading

Strategies to avoid collisions and prevent overloading the boat for safe handling.

Weather and Regulations Awareness

Staying informed about weather, laws, and training for safe boating.

General Information and Identification

Identification Numbers Record

Recording important identification numbers like serial and key numbers for the outboard motor.

EC Declaration of Conformity

Details about the EC Declaration of Conformity for European regulations.

CE Marking Explained

Explanation of the CE marking label on compliant outboard motors.

Manual and Label Reading Guidance

Emphasis on reading all manuals and labels before operation.

Warning Labels Information

Guidance on replacing damaged or missing warning labels.

Warning Label Meanings Explained

Explanation of common warning labels found on the motor.

Symbol Explanations

Meanings of various symbols used in the manual and on the motor.

Engine Data Recording System

How the ECM stores engine data for analysis and research.

Engine Data Privacy Policy

Yamaha's policy on handling and disclosing engine data.

Specifications and Requirements

Outboard Motor Specifications

Detailed technical specifications including dimensions, weight, power, and performance.

Installation Requirements Overview

Key requirements and considerations for installing the outboard motor.

Remote Control and Battery Requirements

Requirements for remote control units and boat battery systems.

Propeller Selection and Start-in-Gear Protection

Guidance on choosing a propeller and how start-in-gear protection works.

Fuel and Oil Requirements

Recommended fuel types and engine oil grades, with usage precautions.

Gasohol, Water Conditions, and Disposal

Guidelines for gasohol, specific water conditions, and motor disposal.

Components Identification and Operation

Components Diagram

Visual identification of key outboard motor parts.

Fuel Tank System Components

Function and usage of the portable fuel tank and its related parts.

Fuel System Controls

Operation of fuel joints, gauge, cap, and vent screw.

Remote Control Box and Lever

Function and operation of the remote control box and lever.

Key Engine Controls and Levers

Operation of neutral interlock, throttle lever, tiller handle, and gear shift.

Throttle Grip and Indicator

How to operate the throttle grip and read the throttle indicator.

Throttle Friction and Shut-Off Cord

Adjusting throttle friction and using the engine shut-off cord.

Engine Stop Button Operation

Function of the engine stop button to shut off the engine.

Starting System Controls

Operation of manual/electric start, main switch, and steering friction adjuster.

Power Trim and Tilt Switch Operation

Operation of power trim and tilt switches on remote control and cowling.

Trolling Speed and Trim Tab Adjustment

Adjusting trolling speed and setting the trim tab for optimal performance.

Tilt Lock and Support Mechanisms

Function of tilt lock, tilt support knob, and tilt support bar.

Cowling Lock and Flushing Device

Operation of the cowling lock lever and flushing device.

Alert Indicator Function

How the alert indicator signals engine conditions.

Engine Control System

Engine Alert System Overview

General information about the engine alert system.

Overheat and Low Oil Pressure Alerts

Details on overheat and low oil pressure alert systems and necessary checks.

Installation Procedures

Outboard Motor Mounting Procedures

Detailed steps for physically mounting the outboard motor onto the boat transom.

Optimal Mounting Height

Importance of correct mounting height for efficiency and performance.

Clamping the Outboard Motor Securely

Procedures for securely clamping the outboard motor to the transom.

Operation Guide

First-Time Operation and Engine Break-in

Initial operation, oil filling, and engine break-in procedures for new motors.

Fuel Level and System Checks

Checking fuel level and inspecting the fuel system for leaks and filter condition.

Control Operation and Engine Oil Checks

How to operate various controls and check engine oil level and condition.

Engine Checks, Flushing, and Cowling Installation

Engine checks, flushing device use, and top cowling installation.

Power Trim and Tilt System Checks

Inspecting the power trim and tilt system for proper function and leaks.

Battery Checks and Fuel Filling

Checking boat battery charge and performing safe fuel filling procedures.

Engine Operation and Fuel Sending

General engine operation precautions and fueling from portable tanks.

Starting the Engine Procedures

Procedures for starting the engine using manual or electric methods.

Electric Start Procedures Details

Further details on electric starting procedures for the engine.

Post-Start and Engine Warm-up Checks

Checks to perform after starting and during engine warm-up.

Checks After Warm-up and Shifting Confirmation

Checks after engine warm-up and confirming smooth gear shifting.

Shifting Gears and Stopping the Boat

Detailed procedures for shifting gears and stopping the boat.

Trolling Speed Adjustment and Engine Stopping

Adjusting trolling speed and safe engine shutdown procedures.

Trimming Outboard Motor for Performance

Importance and adjustment of outboard motor trim angle for manual tilt models.

Power Trim and Tilt Angle Adjustment

How to adjust trim angle using power trim and tilt.

Adjusting Boat Trim for Efficiency

How trim affects boat attitude, stability, and efficiency.

Tilting Outboard Motor Procedures

Procedures for tilting the outboard motor up and down.

Tilting Up Procedures for Manual and Power Models

Step-by-step guides to tilt up manual and power trim/tilt models.

Tilting Down Procedures for Manual and Power Models

Step-by-step guides to tilt down manual and power trim/tilt models.

Shallow Water Cruising Operations

Precautions and procedures for cruising in shallow water.

Operating in Different Water Conditions

How to operate in salt water and muddy/turbid/acidic water.

Maintenance Procedures

Transporting, Storing, and Dismounting Motor

Procedures for transporting, storing, and removing the outboard motor.

Long-Term Outboard Motor Storage

Procedures for long-term storage to prevent damage.

Maintenance Chart 1: Scheduled Checks

Schedule of periodic maintenance tasks and intervals.

Maintenance Chart 2: Additional Checks

Additional maintenance schedule items and intervals.

Greasing and Flushing Power Unit

Greasing points and procedure for flushing the cooling system.

Cleaning Motor and Periodic Maintenance

Washing the motor exterior and general precautions for periodic maintenance.

Severe Operating Conditions and Maintenance

Identifying conditions that necessitate more frequent maintenance.

Fuel Filter Checks and Idle Speed Inspection

Periodic checks of the fuel filter and inspection of engine idle speed.

Engine Oil Change and Wiring Inspection

Procedures for changing engine oil and inspecting wiring.

Why Yamalube Oil?

Benefits and reasons for using Yamalube engine oil.

Propeller Inspection and Removal

Inspecting the propeller for damage and procedures for its removal.

Propeller Installation and Gear Oil Change

Procedures for installing the propeller and changing gear oil.

Anode Inspection and Battery Checks

Checking anodes for corrosion and inspecting the boat battery.

Battery Connection and Disconnection Procedures

Correct procedures for connecting and disconnecting the boat battery.

Yamaha F25G User Manual

Table of Contents

Questions and Answers:

Yamaha F25G Specifications

Summary