Yamaha F115A - Service Manual

Other manuals for Yamaha F115A

Rigging Guide329 pages

Owner's Manual207 pages

Questions and Answers

A
Anita SteinAug 22, 2025
How to fix a Yamaha F115A when the starter will not operate?
- J
  Jeanette HughesAug 22, 2025
  If the starter on your Yamaha Outboard Motor won't operate, begin by checking the battery condition and ensuring it has the recommended capacity. Weak or low battery capacity can prevent the starter from working. Also, verify that the battery connections are tight and free from corrosion; tighten the battery cables and clean the battery terminals if necessary. Inspect the fuse for the electric start circuit and replace it with one of the correct amperage if it's blown, after checking for and repairing any electric overload. Make sure the engine stop switch lanyard is attached and the shift lever is in neutral. For faulty starter components, it is recommended to have your motor serviced by a Yamaha dealer.
M
mtorresAug 26, 2025
How to troubleshoot a Yamaha F115A when the starter will not operate?
- G
  gdanielsAug 26, 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.
T
Tyrone HudsonAug 28, 2025
What to do if my Yamaha F115A Outboard Motor gauge display does not wake up?
- R
  Raymond JimenezAug 28, 2025
  If the gauge display doesn't wake up, it could be due to a lack of electrical power or a damaged gauge. Try these steps: replace the fuse, securely connect the couplers, replace any damaged wires or hubs, or replace the gauge itself.
C
Cindy PughAug 29, 2025
Why is the illumination not lighting on my Yamaha F115A Outboard Motor gauge?
- T
  Trevor BakerAug 29, 2025
  If the illumination isn't lighting, it could be because of a power issue or a damaged gauge. You should try replacing the fuse, ensuring the couplers are securely connected, replacing any damaged wires or hubs, or replacing the gauge.
A
anitagrayAug 31, 2025
Why does my Yamaha F115A Outboard Motor fuel management gauge show incorrect fuel consumption?
- A
  Adam JacksonSep 1, 2025
  If the fuel management gauge shows incorrect fuel consumption, the engine recognition may be wrong. To resolve this, default the engine number. Then, turn the key switch on in order from the portside engine to re-memorize each engine number.
J
John SchmidtSep 2, 2025
How to fix a Yamaha F115A Outboard Motor tachometer that shows incorrect engine RPM?
- L
  Lydia NguyenSep 2, 2025
  If the tachometer shows an incorrect engine RPM, the engine recognition might be wrong. Push the SET button for 10 seconds to default the engine number, and then memorize each engine number again.
J
johnsonmargaretSep 4, 2025
What to do if my Yamaha F115A speedometer shows the incorrect fuel level?
- G
  Gordon WuSep 4, 2025
  If the speedometer shows an incorrect fuel level, the fuel sensor selection is likely wrong. You should set up the fuel sensor to the correct resistance.
K
Karen GarciaSep 6, 2025
What does it mean when my Yamaha F115A Outboard Motor gauge shows “----”?
- J
  Joel TaylorSep 6, 2025
  If the gauge shows “----”, it indicates that the digital signal is not being received. Make sure the couplers are securely connected and replace any damaged bus wires or hubs.
J
Justin BrownSep 8, 2025
Why does my Yamaha Outboard Motor fuel management gauge show incorrect remaining fuel?
- E
  Erica CummingsSep 8, 2025
  If the fuel management gauge shows incorrect remaining fuel, the fuel capacity setting is probably wrong. Fill the tank with fuel, and then set the correct fuel tank capacity.
J
Jaclyn WangSep 10, 2025
Why does my Yamaha Outboard Motor trim gauge show the incorrect position?
- C
  Cheyenne RodriguezSep 10, 2025
  If the trim gauge shows an incorrect position, the initial position setting might be wrong, or the trim sensor could be damaged. Put the motor in the fully trimmed-in position and reset the initial (zero) trim angle. If that doesn't work, replace the trim sensor.

Summary

CHAPTER 1 GENERAL INFORMATION

IDENTIFICATION

Locates and identifies the outboard motor's serial number stamped on a label.

SAFETY WHILE WORKING

Provides procedures recommended by Yamaha for safe maintenance and repair operations.

CHAPTER 2 SPECIFICATIONS

GENERAL SPECIFICATIONS

MAINTENANCE SPECIFICATIONS

Lists maintenance specifications for the power unit, cylinders, pistons, and rings.

TIGHTENING TORQUES

CHAPTER 3 PERIODIC INSPECTIONS AND ADJUSTMENTS

MAINTENANCE INTERVAL CHART

Guide to general maintenance intervals, adaptable to operating conditions.

FUEL SYSTEM

Procedures for checking fuel lines, filters, and pressure.

CONTROL SYSTEM

Checks and adjustments for throttle body pickup timing, cables, and sensors.

POWER UNIT

Checks related to engine oil level, oil filter replacement, and timing belt.

POWER TRIM AND TILT SYSTEM

LOWER UNIT

CHAPTER 4 FUEL SYSTEM

THROTTLE BODY

HIGH-PRESSURE FUEL LINE

Procedures for removing/installing and reducing pressure in the high-pressure fuel line.

FUEL INJECTORS

HIGH-PRESSURE FUEL PUMP

THROTTLE POSITION SENSOR

FUEL PUMP

CHAPTER 5 POWER UNIT

FLYWHEEL MAGNET ASSEMBLY

Procedures for removing, installing, and disassembling the flywheel magnet assembly.

TIMING BELT

Procedures for removing, installing, and adjusting the timing belt and tensioner.

IGNITION COILS AND STARTER MOTOR

ECM AND JUNCTION BOX ASSEMBLY

CYLINDER HEAD ASSEMBLY

Procedures for removing, installing, and checking the cylinder head assembly and thermostat.

CAMSHAFTS

VALVES

CRANKSHAFT AND PISTON;CONNECTING ROD ASSEMBLY

Procedures for removing, installing, and checking crankshaft, piston, and connecting rod components.

CHAPTER 6 LOWER UNIT

PROPELLER SHAFT HOUSING ASSEMBLY (REGULAR ROTATION MODELS)

DRIVE SHAFT (REGULAR ROTATION MODELS)

LOWER CASE ASSEMBLY (REGULAR ROTATION MODELS)

BACKLASH (REGULAR ROTATION MODELS)

Procedures for measuring and adjusting forward and reverse gear backlash.

BACKLASH (COUNTER ROTATION MODELS)

Procedures for measuring and adjusting forward and reverse gear backlash.

CHAPTER 7 BRACKET UNIT

STEERING HANDLE (OPTION)

UPPER CASE ASSEMBLY

POWER TRIM AND TILT UNIT

Procedures for removing, installing, filling, and bleeding the power trim and tilt unit.

CHAPTER 8 ELECTRICAL SYSTEMS

ELECTRICAL COMPONENTS

WIRE HARNESS

Provides a wiring diagram and color codes for connections.

ELECTRICAL COMPONENTS ANALYSIS

Details procedures for using a digital circuit tester and measuring voltage and resistance.

IGNITION SYSTEM

Procedures for checking battery, fuses, ignition coil, spark gap, and peak voltage.

IGNITION CONTROL SYSTEM

Checks for battery, fuses, pulser coil, ECM, and throttle position sensor.

STARTING SYSTEM

Procedures for checking battery, fuses, starter relay, and starter motor components.

CHARGING SYSTEM

POWER TRIM AND TILT SYSTEM

CHAPTER 9 TROUBLE ANALYSIS

TROUBLE ANALYSIS

Provides a chart for diagnosing common engine problems.

SELF-DIAGNOSIS

DIAGNOSIS THE ELECTRONIC CONTROL SYSTEM

TROUBLE SHOOTING FOR ELECTRIC FUEL INJECTION

Troubleshooting steps for common electric fuel injection issues.

Yamaha F115A Specifications

General

Compression Ratio	10.0:1
Fuel Induction System	EFI (Electronic Fuel Injection)
Lubrication System	Wet sump
Ignition System	TCI (Transistor Controlled Ignition)
Starting System	Electric
Alternator Output	35 Amp
Cooling System	Water-cooled
Steering	Remote
Engine Type	4-stroke, DOHC, 16-valve
Displacement	1832 cc
Max. Power Output	115 hp
Operating Range	5300 - 6300 rpm
Full Throttle RPM Range	5300 - 6300 rpm
Recommended Fuel	Regular Unleaded
Gear Ratio	2.15:1
Shaft Length	20 in (508 mm) / 25 in (635 mm)
Recommended Oil	Yamalube 4M
Exhaust	Through prop
Oil Pan Capacity	4.5 liters