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Yamaha F50A - Service Manual

Yamaha F50A
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SERVICE MANUAL
62Y-28197-3A-11
290408
F50A
FT50B
FT50C

Table of Contents

Other manuals for Yamaha F50A

Preview: Owner's Manual
Owner's Manual222 pages

Questions and Answers

  • M
    Michelle HortonAug 1, 2025
    What to do if my Yamaha F50A Outboard Motor engine will not start?
    • K
      Karen JohnsonAug 1, 2025
      If your Yamaha Outboard Motor engine won't start, possible causes include an empty or contaminated fuel tank (fill with clean, fresh fuel), a clogged fuel filter (clean or replace it), incorrect starting procedure (consult the 'STARTING ENGINE' section), malfunctioning fuel pump, fouled or incorrect spark plugs (inspect, clean, or replace), incorrectly fitted spark plug caps (check and refit), poor ignition wiring (check for wear, tighten connections, replace if needed), faulty ignition parts, unattached engine stop switch lanyard (attach it), or damaged engine inner parts. For fuel pump malfunctions, faulty ignition parts, or damaged engine inner parts, have your motor serviced by a Yamaha dealer.
  • S
    Steven AlexanderAug 15, 2025
    How to troubleshoot a Yamaha F50A when the starter will not operate?
    • A
      Andrew ButlerAug 15, 2025
      If the starter on your Yamaha Outboard Motor won't operate, begin by checking the battery. Ensure it's in good condition and has the recommended capacity. Tighten any loose battery cables and clean corroded terminals. Inspect the fuse for the electric start circuit and replace it if blown, after addressing the cause of the overload. Ensure the engine stop switch lanyard is attached and the shift lever is in neutral.
  • B
    Brian WestAug 23, 2025
    How to fix a Yamaha F50A when the starter will not operate?
    • T
      Tracy CruzAug 23, 2025
      If the starter on your Yamaha Outboard Motor won't operate, here are some things to check: * The battery capacity might be weak or low – check the battery condition and use a battery of the recommended capacity. * Battery connections could be loose or corroded – tighten the battery cables and clean the battery terminals. * The fuse for the electric start circuit might be blown – check for the cause of the electric overload and repair it, then replace the fuse with one of the correct amperage. * Make sure the engine stop switch lanyard is attached and the shift lever is in neutral. If these steps don't resolve the issue, the starter components may be faulty, requiring service by a Yamaha dealer.
  • M
    Misty JonesNov 6, 2025
    What to do if my Yamaha Outboard Motor engine won't start but the starter operates?
    • D
      David SerranoNov 6, 2025
      If your Yamaha Outboard Motor engine won't start but the starter is working, consider these potential issues: * The fuel tank might be empty – if so, fill it with clean, fresh fuel. * The fuel could be contaminated or stale – in this case, replace it with clean, fresh fuel. * A clogged fuel filter could be the problem – try cleaning or replacing it. * The starting procedure might be incorrect – refer to the "STARTING ENGINE" section. * The spark plugs could be fouled or of an incorrect type – inspect them, and clean or replace them with the recommended type. * Spark plug caps might be incorrectly fitted – check and refit them. * There may be poor connections or damaged ignition wiring – inspect the wires for wear or breaks, tighten any loose connections, and replace worn or ...

Summary

General Information

How to Use This Manual

Guidance on service procedures and manual format.

Safety While Working

Essential safety precautions for workshop procedures.

Identification

Information on applicable models and serial number location.

Features and Benefits

Highlights of key design features and advantages.

Technical Tips

In-depth explanations of specific systems and components.

Propeller Selection

Guidance for selecting an optimal propeller for performance.

Predelivery Checks

Mandatory checks before unit delivery for smooth operation.

Specifications

General Specifications

Key overall specifications of the outboard motor models.

Maintenance Specifications

Detailed technical data for component maintenance.

Tightening Torques

Specified torque values for critical fasteners.

Periodic Checks and Adjustments

Special Service Tools

List of specialized tools required for maintenance.

Maintenance Interval Chart

Guideline for recommended routine maintenance.

Top Cowling

Procedures for checking the top cowling fit.

Fuel System

Maintenance procedures for fuel system components.

Power Unit

Maintenance checks and adjustments for the power unit.

Timing Belt and Sprockets

Service procedures for the timing belt and sprockets.

Cylinder Head

Checks and adjustments for the cylinder head assembly.

Control System

Checks for throttle, gearshift, and ignition timing operations.

Power Trim and Tilt Unit

Checks and adjustments for the power trim and tilt system.

Lower Unit

Maintenance procedures for the lower unit components.

General

General maintenance checks and lubrication points.

Fuel System

Special Service Tools

Tools required for fuel system diagnostics and repair.

Hose Routing

Diagrams illustrating fuel and blowby hose connections.

Fuel Line

Information on fuel line components and layout.

Fuel Filter and Fuel Pump

Procedures for checking and servicing the fuel filter and pump.

Carburetor Unit

Detailed information on carburetor assembly and adjustments.

Power Unit

Troubleshooting

Diagnostic procedures for common power unit issues.

Special Service Tools

List of specialized tools for power unit maintenance and repair.

Power Unit

Procedures for checking and removing the power unit.

Timing Belt and Sprockets

Service procedures for the timing belt and sprockets.

Cylinder Head

Procedures for cylinder head removal, checking, and installation.

Lower Unit

Special Service Tools

Specialized tools for lower unit service and repair.

Lower Unit (F50;F50 A)

Procedures specific to the F50/F50A lower unit.

Water Pump and Propeller Shaft Housing (F50;F50 A)

Service procedures for the water pump and propeller shaft housing.

Drive Shaft and Lower Case (F50;F50 A)

Procedures for servicing the drive shaft and lower case.

Shimming (F50) (for USA and Canada)

Instructions for pinion, forward, and reverse gear shimming.

Shimming (F50 A) (for worldwide)

Instructions for pinion, forward, and reverse gear shimming.

Backlash (F50;F50 A)

Procedures for measuring forward and reverse gear backlash.

Lower Unit (T50;FT50 B, FT50 C)

Procedures specific to the T50/FT50B/FT50C lower unit.

Water Pump and Shift Rod (T50;FT50 B, FT50 C)

Service procedures for the water pump and shift rod.

Propeller Shaft Housing (T50;FT50 B, FT50 C)

Service procedures for the propeller shaft housing.

Drive Shaft and Lower Case (T50;FT50 B, FT50 C)

Procedures for servicing the drive shaft and lower case.

Shimming (T50) (for USA and Canada)

Instructions for pinion and forward gear shimming.

Shimming (FT50 B, FT50 C) (for worldwide)

Instructions for pinion and forward gear shimming.

Backlash (T50;FT50 B, FT50 C)

Procedures for measuring gear backlash.

Bracket Unit

Troubleshooting

Diagnostic procedures for power trim and tilt unit issues.

Special Service Tools

Tools required for bracket unit service and repair.

Tiller Handle (F50;F50 A, T50;FT50 B)

Procedures for servicing the tiller handle on these models.

Tiller Handle (FT50 C)

Procedures for servicing the tiller handle on the FT50C model.

Bottom Cowling

Procedures for checking the bottom cowling.

Upper Case

Procedures for disassembling and installing the upper case.

Clamp Brackets

Procedures for removing, installing, and adjusting clamp brackets.

Swivel Bracket and Steering Arm

Procedures for removing and installing the steering arm.

Power Trim and Tilt Unit

Procedures for removing the power trim and tilt unit.

Tilt Cylinder and Trim Cylinder

Information on tilt and trim cylinder components.

Trim Cylinder

Procedures related to the trim cylinder.

Electrical Systems

Troubleshooting

Diagnostic procedures for charging system issues.

Special Service Tools

Tools required for electrical system service and repair.

Checking the Electrical Components

Procedures for measuring voltage and resistance.

Electrical Components

Identification of electrical components in various views.

Wiring Harness

Diagrams and color codes for the wiring harness.

Ignition System and Ignition Control System

Checks and procedures for the ignition system.

Starting System

Checks for fuses, wiring harness, switches, and relays.

Starter Motor

Procedures for removing, checking, and assembling the starter motor.

Charging System

Checks for lighting coil and rectifier regulator.

Yamaha F50A Specifications

General IconGeneral
BrandYamaha
ModelF50A
CategoryOutboard Motor
LanguageEnglish

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