Yamaha 4A - User Manual

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OWNER’S MANUAL

MANUEL D’UTILISATION

MANUAL DEL PROPIETARIO

6A1-28199-7L

6A1-9-7L hyoshi 4/9/02 1:41 PM Page 1 (2,1)

Main Page

Questions and Answers

M
Mr. Jeremiah PierceAug 7, 2025
Why won't the starter operate on my Yamaha Outboard Motor?
- D
  Danielle MiddletonAug 7, 2025
  If the starter on your Yamaha Outboard Motor won't operate, it could be due to a weak or low battery (check its condition and use the recommended capacity), loose or corroded battery connections (tighten cables and clean terminals), a blown fuse in the electric start circuit (check for overload, repair, and replace the fuse with the correct amperage), faulty starter components, or the shift lever being in gear (position it to neutral). If the starter components are faulty, have a Yamaha dealer service them.
E
Edward WeberNov 18, 2025
How to fix irregular idling or stalling in my Yamaha 4A Outboard Motor?
- M
  Mark MortonNov 18, 2025
  If your Yamaha Outboard Motor engine idles irregularly or stalls, the possible causes include fouled or incorrect spark plugs (inspect, clean, or replace), an obstructed fuel system (check for pinched or kinked fuel lines), contaminated or stale fuel (use clean, fresh fuel), a clogged fuel filter (clean or replace it), failed ignition parts, an activated warning system (find and correct the cause), an incorrect spark plug gap (inspect and adjust), poor ignition wiring (check for wear and tighten connections), using the wrong engine oil (replace with specified oil), a faulty or clogged thermostat, incorrect carburetor adjustments, a damaged fuel pump, a closed air vent screw on the fuel tank (open it), the choke knob being pulled out (return to home position), the motor angle being too high...

Summary

Chapter 1: GENERAL INFORMATION

SAFETY INFORMATION

Provides essential safety precautions for operating the outboard motor and boat, covering warnings and advice.

FUELING INSTRUCTIONS

Details the safe procedures for refueling the outboard motor, including precautions for gasoline handling and storage.

GASOLINE AND ENGINE OIL

Specifies the recommended types of gasoline and engine oil, including mixture ratios and important notes.

Chapter 2: BASIC COMPONENTS

MAIN COMPONENTS

Identifies and illustrates the key external parts of the outboard motor, providing a visual reference for users.

OPERATIONS OF CONTROLS AND OTHER FUNCTIONS

Explains the function and operation of various controls and other essential parts of the outboard motor.

Chapter 3: OPERATION

INSTALLATION

Covers the essential steps and considerations for correctly mounting the outboard motor onto the boat for safe operation.

STARTING ENGINE

Provides detailed instructions and safety precautions for starting the outboard motor, including manual start procedures.

STOPPING ENGINE

Details the correct procedures for safely stopping the outboard motor, including important notes and precautions.

Chapter 4: MAINTENANCE

SPECIFICATIONS

Lists the technical specifications for different models, including dimensions, performance, engine, and fuel/oil details.

PERIODIC MAINTENANCE

Outlines the recommended maintenance schedule and tasks, indicating items for self-service and dealer service.

CHECKING PROPELLER; SHEAR PIN AND COTTER PIN

Provides guidance on inspecting the propeller, shear pin, and cotter pin for wear, damage, and proper condition.

Chapter 5: TROUBLE RECOVERY

TROUBLESHOOTING

Offers a comprehensive guide to diagnosing and resolving common problems with the outboard motor's starting and operation.

IMPACT DAMAGE

Details temporary actions to take in case of impact damage to the outboard motor, including immediate steps and inspection.

Chapter 6: INDEX

INDEX

Alphabetical listing of topics covered in the manual, with corresponding page numbers for easy reference.

Yamaha 4A Specifications

General

Fuel Induction System	Carburetor
Starting System	Manual
Ignition System	CDI
Max. Output	4 hp
Full Throttle RPM Range	4500 - 5500 rpm
Gear Ratio	2.08
Weight	22 kg
Gear Shift	F-N
Shaft Length	Short (381 mm)