Yamaha F8B User Manual (English)

Questions and Answers:

J
jamie77Aug 6, 2025
Why is my Yamaha F8B losing power?
- A
  Angela CannonAug 6, 2025
  If you're experiencing power loss with your Yamaha Outboard Motor, several factors could be responsible. Start by inspecting the propeller for damage and have it repaired or replaced if necessary. Check that the propeller's pitch and diameter are correct for optimal speed. Adjust the trim angle for efficient operation. Ensure that the boat bottom is clean from marine growth, and the gear housing isn't tangled with weeds or other foreign matter. Inspect the spark plugs, replacing them if they are fouled or incorrect. Also, make sure that you are using the specified engine oil. Check the fuel lines and filter for obstructions or clogs, and use clean, fresh fuel.
T
timothy94Aug 11, 2025
How to fix irregular idling or stalling in a Yamaha Outboard Motor?
- A
  Andrew RuizAug 11, 2025
  If your Yamaha Outboard Motor idles irregularly or stalls, there are several potential causes to investigate. Begin by checking the spark plugs; if they are fouled or the incorrect type, clean or replace them. Inspect the fuel system for any obstructions, such as pinched or kinked fuel lines. Ensure that you're using clean, fresh fuel. Clean or replace the fuel filter if it's clogged. Also, make sure that the air vent screw on the fuel tank is open and the choke knob is in home position. If applicable, ensure the fuel joint connection is correct and the battery lead is securely connected. Check that the motor angle is at normal operating position.
H
hunterweberAug 16, 2025
What to do if the warning buzzer sounds on my Yamaha F8B Outboard Motor?
- C
  Christopher KellyAug 16, 2025
  If the warning buzzer sounds or the indicator lamp lights on your Yamaha Outboard Motor, it could be due to several oil-related issues. First, check the engine oil level and fill the oil tank with the specified engine oil if it's low. Ensure that you are using the specified engine oil; if not, replace it with the correct type. Also, consider whether the engine oil is contaminated or deteriorated, and replace it with fresh, specified oil if needed.
C
Carl MckinneyAug 21, 2025
How to troubleshoot a Yamaha F8B when the starter will not operate?
- C
  Christopher JacksonAug 21, 2025
  If the starter on your Yamaha Outboard Motor won't operate, start by checking the battery. It might be weak or have low capacity, so ensure it's in good condition and has the recommended capacity. Also, check the battery connections for looseness or corrosion; tighten the cables and clean the terminals if needed. Verify that the shift lever is in neutral. If a fuse for the electric start circuit is blown, identify the cause of the overload, repair it, and replace the fuse with one of the correct amperage.
V
vickie51Aug 26, 2025
What to do if my Yamaha Outboard Motor engine will not start, but the starter is working?
- J
  Jennifer WeissAug 26, 2025
  If your Yamaha Outboard Motor's engine won't start but the starter operates, begin by checking the fuel level; the tank may be empty. Ensure the fuel is clean and fresh, replacing it if contaminated or stale. Inspect the fuel filter for clogs and clean or replace it if necessary. Make sure the engine stop switch lanyard is attached. Check the spark plugs; if they're fouled or the wrong type, clean or replace them with the recommended type. Also, check the spark plug caps to be sure they are correctly fitted. Examine the ignition wiring for damage or loose connections, and repair or tighten as needed.
S
Sarah BennettAug 30, 2025
Why is my Yamaha F8B Outboard Motor vibrating so much?
- S
  Susan WoodAug 31, 2025
  If your Yamaha Outboard Motor is vibrating excessively, check the following: 1. Inspect the propeller for any damage and have it repaired or replaced if necessary. 2. Remove any weeds or foreign matter tangled on the propeller. 3. Tighten any loose motor mounting bolts and the clamp screw. Also, check if the steering pivot is loose or damaged and tighten it.

Yamaha F8B Specifications

General

Brand	Yamaha
Model	F8B
Category	Outboard Motor
Language	English

Summary

Chapter 1: General Information

Identification Numbers

Details about outboard motor and key identification numbers.

Emission Control Information

Information on emission standards and labels for North American models.

Star Labels

Explanation of California Air Resources Board (CARB) star labels.

Safety Information

Essential safety precautions for operating the outboard motor.

Important Labels

Identification and explanation of warning and caution labels.

Basic Boating Rules (Rules of the Road)

Rules for navigation, steering, and signaling on waterways.

Fueling Instructions

Guidelines for safely refueling the outboard motor.

Engine Oil

Recommended engine oil types and specifications.

Battery Requirement

Specifications for batteries used with electric start models.

Propeller Selection

Guidance on choosing the correct propeller for optimal performance.

Start-in-Gear Protection

Explanation of the safety feature preventing engine start in gear.

Chapter 2: Basic Components

Main Components

Identification and illustration of key outboard motor parts.

Operations of Controls and Other Functions

Detailed explanation of various controls and their functions.

Warning System

Information on the engine warning system and indicators.

Chapter 3: Operation

Installation

Procedures for mounting and clamping the outboard motor.

Breaking in Engine

Instructions for the initial run-in period of a new engine.

Pre-Operation Checks

Essential checks before starting the outboard motor.

Filling Fuel

How to safely and correctly fill the fuel tank.

Starting Engine

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

Warming Up Engine

Procedures for warming up the engine after starting.

Shifting

How to change between forward, neutral, and reverse gears.

Stopping Engine

Proper procedure for shutting down the outboard motor.

Trimming Outboard Motor

Adjusting the motor's angle for optimal performance and efficiency.

Tilting Up/Down

Instructions for manually or power tilting the outboard motor.

Cruising in Shallow Water

Procedures for operating the boat in shallow water conditions.

Cruising in Other Conditions

Guidelines for operating in salt or turbid water conditions.

Chapter 4: Maintenance

Specifications

Technical data and specifications for the outboard motor.

Transporting and Storing Outboard Motor

Guidelines for safely transporting and storing the outboard motor.

Periodic Maintenance

Schedule and procedures for regular maintenance tasks.

Greasing

Instructions for lubricating various parts of the outboard motor.

Cleaning and Adjusting Spark Plug

Procedures for inspecting, cleaning, and adjusting spark plugs.

Checking Fuel System

How to inspect the fuel system for leaks or damage.

Inspecting Fuel Filter

Procedure for checking and maintaining the fuel filter.

Adjusting Idling Speed

Method for setting the correct idling speed for the engine.

Changing Engine Oil

Steps for draining and refilling the engine oil.

Checking Timing Belt

How to inspect the timing belt for wear or damage.

Replacing Fuse

Instructions for replacing blown fuses in the electrical system.

Checking Wiring and Connectors

How to ensure electrical wiring and connectors are secure.

Checking Power Tilt System

Procedures for inspecting the power tilt unit and switches.

Checking Propeller

How to inspect the propeller for damage or wear.

Changing Gear Oil

Steps for draining and refilling the gear case oil.

Cleaning Fuel Tank

Procedure for cleaning the fuel tank and fuel filter.

Inspecting and Replacing Anode(s)

How to check and replace sacrificial anodes for corrosion protection.

Checking Battery

Procedures for checking the battery's condition and maintenance.

Checking Bolts and Nuts

How to ensure critical bolts and nuts are properly tightened.

Cleaning Cooling-Water Passages

How to flush the cooling system to prevent blockages.

Motor Exterior

Cleaning and maintaining the exterior of the outboard motor.

Chapter 5: Trouble Recovery

Troubleshooting

Common problems, possible causes, and remedies for the outboard motor.

Temporary Action in Emergency

Steps to take in urgent situations like impact damage or system failure.

Starter Will Not Operate

Procedure for starting the engine using an emergency starter rope.

Engine Fails to Operate

Emergency procedure for starting the engine without normal controls.

Treatment of Submerged Motor

Steps to minimize engine damage if the motor is submerged.

Chapter 6: Index

Index

Alphabetical listing of topics and their corresponding page numbers.

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Table of Contents

Questions and Answers:

Yamaha F8B Specifications

Summary

Chapter 1: General Information

Identification Numbers

Emission Control Information

Star Labels

Safety Information

Important Labels

Basic Boating Rules (Rules of the Road)

Fueling Instructions

Engine Oil

Battery Requirement

Propeller Selection

Start-in-Gear Protection

Chapter 2: Basic Components

Main Components

Operations of Controls and Other Functions

Warning System

Chapter 3: Operation

Installation

Breaking in Engine

Pre-Operation Checks

Filling Fuel

Starting Engine

Warming Up Engine

Shifting

Stopping Engine

Trimming Outboard Motor

Tilting Up/Down

Cruising in Shallow Water

Cruising in Other Conditions

Chapter 4: Maintenance

Specifications

Transporting and Storing Outboard Motor

Periodic Maintenance

Greasing

Cleaning and Adjusting Spark Plug

Checking Fuel System

Inspecting Fuel Filter

Adjusting Idling Speed

Changing Engine Oil

Checking Timing Belt

Replacing Fuse

Checking Wiring and Connectors

Checking Power Tilt System

Checking Propeller

Changing Gear Oil

Cleaning Fuel Tank

Inspecting and Replacing Anode(s)

Checking Battery

Checking Bolts and Nuts

Cleaning Cooling-Water Passages

Motor Exterior

Chapter 5: Trouble Recovery

Troubleshooting

Temporary Action in Emergency

Starter Will Not Operate

Engine Fails to Operate

Treatment of Submerged Motor

Chapter 6: Index

Index

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