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Yamaha 4AC User Manual

Yamaha 4AC
66 pages
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Read this manual carefully before operating this
outboard motor.
OWNER’S MANUAL
4AC
5C
6E0-28199-28-E0
U6E028E0.book Page 1 Tuesday, February 10, 2009 3:19 PM

Table of Contents

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Yamaha 4AC Specifications

General IconGeneral
Fuel Induction SystemCarburetor
Starting SystemManual
Gear Ratio2.08:1
Engine Type2-stroke
Prop Shaft Horsepower / Max. Output / Max Power4 hp
Full Throttle RPM Range4, 500 - 5, 500 rpm
Ignition SystemCDI
Lubrication SystemPremix
Gear ShiftF-N
Shaft LengthS

Summary

Safety Information

Outboard Motor Safety

Essential precautions for operating the outboard motor safely at all times.

Modifications

Warning against modifying the outboard motor to maintain safety and legality.

Boating Safety

General safety precautions to follow while boating.

Weather

Advice on staying informed about weather forecasts and avoiding hazardous conditions.

Laws and Regulations

Importance of knowing and obeying marine laws and regulations.

General Information

Identification Numbers Record

Recording outboard motor serial and other identification numbers for reference.

CE Marking

Explanation of CE marking and conformity with European directives.

EC Declaration of Conformity (DoC)

Information on the outboard motor's conformity with European Parliament directives.

C-Tick Label

Information on labels conforming to Australian Radio Communications Act.

Read Manuals and Labels

Importance of reading all manuals and labels before operation or maintenance.

Symbols

Explanation of various symbols used in the manual for hazard identification.

Specifications and Requirements

Specifications

Detailed technical specifications of the outboard motor, including dimensions and performance.

Installation Requirements

Guidelines and precautions for installing the outboard motor.

Propeller Selection

Guidance on choosing the right propeller for optimal performance.

Engine Oil Requirements

Recommended engine oil type and specifications.

Fuel Requirements

Information on recommended gasoline type and octane rating.

Muddy or Acidic Water

Recommendations for using the motor in specific water conditions.

Emergency Equipment

Essential items to keep onboard for emergencies.

Components

Components Diagram

Illustrated diagram identifying major outboard motor components.

Air Vent Screw

Location and function of the fuel tank air vent screw.

Fuel Cock

Operation of the fuel cock to control fuel flow to the engine.

Tiller Handle

Description of the tiller handle for steering the boat.

Gear Shift Lever

Operation of the gear shift lever for forward, neutral, and reverse.

Throttle Grip

How to use the throttle grip to control engine speed.

Throttle Friction Adjuster

Adjusting resistance on the throttle grip for steady speed.

Engine Shut-off Cord (Lanyard) and Clip

Function and proper use of the engine shut-off cord.

Steering Friction Adjuster

Adjusting steering friction for comfortable operation.

Cowling Lock Lever(s) (Turn Type)

How to remove and install the engine top cowling.

Installation

Mounting the Outboard Motor

General guidance on properly mounting the outboard motor on the transom.

Mounting Height

Proper mounting height for optimal efficiency and to prevent issues like cavitation.

Clamping the Outboard Motor

Steps for securely clamping the outboard motor to the transom.

Operation

First-Time Operation

Procedures for initial engine operation, including break-in.

Fuel Level

Checking and maintaining adequate fuel levels for safe operation.

Fuel System

Checks and maintenance related to the fuel system for safe operation.

Controls

Inspecting the smooth operation of steering and throttle controls.

Engine Shut-off Cord (Lanyard)

Inspecting the engine shut-off cord for damage and proper function.

Install Cowling

Correct procedure for installing the engine top cowling.

Filling Fuel for Portable Tank

Safe procedure for filling the portable fuel tank.

Filling Fuel for Built-in Tank

Safe procedure for filling the built-in fuel tank.

Gasoline and Oil Mixing (100:1)

Correct ratio and procedure for mixing gasoline and oil.

Starting Engine

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

Stopping Boat

Safe methods for slowing down and stopping the boat.

Stopping Engine

Procedure for safely shutting down the outboard motor.

Trimming Outboard Motor

Adjusting the outboard motor's trim angle for optimal performance.

Adjusting Boat Trim

How boat trim affects handling, stability, and efficiency.

Tilting Up and Down

Procedures for tilting the outboard motor up or down for protection or storage.

Shifting

Proper procedure for shifting gears while operating the boat.

Checks After Engine Warm-up

Final checks after the engine has warmed up.

Maintenance

Lubrication

Procedures for lubricating various parts of the outboard motor.

Cleaning the Outboard Motor

How to wash and flush the outboard motor after use.

Periodic Maintenance

Overview of regular maintenance tasks and their importance.

Replacement Parts

Guidance on using genuine Yamaha parts for replacements.

Maintenance Chart 1

Schedule of maintenance tasks based on operating hours.

Cleaning and Adjusting Spark Plug

Procedure for cleaning, inspecting, and adjusting spark plugs.

Checking Fuel Filter

How to inspect and replace the fuel filter.

Inspecting Idling Speed

Procedure for checking and adjusting the engine's idle speed.

Removing Propeller

Steps for safely removing the propeller.

Installing Propeller

Steps for safely installing the propeller.

Changing Gear Oil

Procedure for draining and refilling the gear oil.

Cleaning Fuel Tank

Safe procedure for cleaning the fuel tank.

Inspecting and Replacing Anode(s)

Importance and procedure for inspecting/replacing sacrificial anodes.

Trouble Recovery

Troubleshooting

Guide to diagnosing and resolving common engine problems.

Starter Will Not Operate

Steps to take if the starter mechanism fails to operate.

Engine Idles Irregularly or Stalls

Common causes and solutions for irregular idling or stalling.

Alert Buzzer Sounds or Indicator Lights

Interpreting and responding to alert system warnings.

Engine Power Loss

Diagnosing and addressing issues causing a loss of engine power.

Engine Vibrates Excessively

Identifying causes and solutions for excessive engine vibration.

Temporary Action in Emergency

Procedures for handling emergencies and returning to safety.

Impact Damage

What to do if the outboard motor sustains impact damage.

Starter Will Not Operate (Emergency)

Using an emergency starter rope when the main starter fails.

Treatment of Submerged Motor

Immediate actions required if the outboard motor is submerged.

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