Yamaha 15F User Manual (English)

Questions and Answers:

C
Chad Harvey VAug 17, 2025
What to do if my Yamaha 15F engine will not start, but the starter operates?
- J
  Jacqueline MasonAug 17, 2025
  If your Yamaha Outboard Motor's engine won't start, even though the starter is working, consider these possibilities: * The fuel tank could be empty. Refill it with clean, fresh fuel. * The fuel might be contaminated or stale. Replace it with clean, fresh fuel. * A clogged fuel filter could be the issue. Clean or replace the filter. * The engine stop switch lanyard may not be attached. Attach the lanyard.
D
dcolemanAug 20, 2025
What to do if Yamaha 15F Outboard Motor engine will not start (Starter operates)?
- D
  Dennis JosephAug 20, 2025
  If your Yamaha Outboard Motor's engine won't start but the starter operates, try these steps: 1. Ensure the fuel tank is filled with clean, fresh fuel. 2. Clean or replace the fuel filter if it's clogged. 3. Attach the engine stop switch lanyard. 4. Shift to neutral. 5. Inspect the spark plug(s). Clean or replace with the recommended type if fouled or incorrect. 6. Check and refit the spark plug cap(s) if fitted incorrectly. 7. Check wires for wear or breaks, tighten all loose connections, and replace worn or broken wires. For incorrect starting procedure consult the "STARTING ENGINE" section. If problems persist, the fuel pump, ignition parts, or engine inner parts may be faulty, and you should have it serviced by a Yamaha dealer.
A
Amy RobinsonAug 28, 2025
How to fix a Yamaha Outboard Motor when the starter will not operate?
- M
  mlarsonAug 28, 2025
  If the Yamaha Outboard Motor's starter doesn't operate, here's what to check: * Ensure the engine stop switch lanyard is attached. * Make sure the shift lever is in neutral. * Check the battery condition and use the recommended capacity if it's weak or low. * Tighten any loose or corroded battery connections and clean the terminals. * Inspect the fuse for the electric start circuit; if blown, find the cause of the overload and replace the fuse with the correct amperage. * If none of these steps work, the starter components may be faulty and should be serviced by a Yamaha dealer.
S
scott35Sep 2, 2025
What causes a Yamaha 15F to vibrate excessively?
- I
  ireidSep 2, 2025
  If your Yamaha Outboard Motor vibrates excessively, here are a few things to inspect: * Check the propeller for any damage and have it repaired or replaced if necessary. * Remove any weeds or foreign matter tangled on the propeller and clean it. * Tighten the motor mounting bolt. For a damaged propeller shaft or steering pivot issues, have it serviced by a Yamaha dealer.
J
johnheathSep 5, 2025
What to do if the starter will not operate on my Yamaha 15F?
- T
  Tony RamirezSep 5, 2025
  If your Yamaha Outboard Motor's starter isn't operating, here's what you can check: * The battery might be weak or have low capacity. Inspect its condition and replace it with a battery of the recommended capacity. * Loose or corroded battery connections can also be the culprit. Tighten the battery cables and clean the terminals. * The fuse for the electric start circuit may have blown. Find the cause of the electrical overload, fix it, and then replace the fuse with one that has the correct amperage. * Ensure that the shift lever is in neutral.
M
Ms. Mary DunnSep 8, 2025
Why Yamaha 15F engine will not start with working starter, and what to do?
- B
  Brandon MillerSep 8, 2025
  If your Yamaha Outboard Motor's engine won't start, even though the starter is working, it might be due to incorrect spark plugs. Inspect the spark plugs and replace them with the recommended type if needed. Also, ensure that the spark plug caps are correctly fitted.
M
Michael FowlerSep 12, 2025
What to do if Yamaha 15F Outboard Motor won't start due to wiring?
- K
  Katherine DonaldsonSep 12, 2025
  If your Yamaha Outboard Motor's engine won't start, even though the starter is working, check for poor connections or damaged ignition wiring. Look for wear or breaks in the wires, tighten any loose connections, and replace any worn or broken wires.

Yamaha 15F Specifications

General

Maximum Output	15 HP
Prop Shaft Horsepower	15 HP
Fuel Induction System	Carburetor
Starting System	Electric
Lubrication	Wet Sump
Oil Capacity	1.1 L
Gear Ratio	2.08:1
Alternator Output at W.O.T.	12V - 6A
Engine Type	4-stroke
Displacement	362 cc
Full Throttle RPM Range	5000 - 6000 rpm

Summary

GENERAL INFORMATION

IDENTIFICATION NUMBERS RECORD

Record motor serial number and key number for identification and reference.

SAFETY INFORMATION

Crucial safety precautions and guidelines for operating the outboard motor.

FUELING INSTRUCTIONS

Procedures and precautions for safely fueling the outboard motor with gasoline.

BATTERY REQUIREMENT

Specifications and precautions for selecting and using batteries with the motor.

PROPELLER SELECTION

Guidance on choosing the correct propeller for optimal performance and motor longevity.

START-IN-GEAR PROTECTION

Explanation of the safety feature preventing engine start when in gear.

BASIC COMPONENTS

MAIN COMPONENTS

Identifies and illustrates the primary external parts of the outboard motor.

OPERATIONS OF CONTROLS AND OTHER FUNCTIONS

Explains the function and operation of various controls and features.

OPERATION

INSTALLATION

Instructions and precautions for correctly mounting the outboard motor on the boat.

FILLING FUEL AND ENGINE OIL

Step-by-step guide for filling the fuel tank and mixing oil with gasoline.

PRE-OPERATION CHECKS

Essential checks to perform before starting the engine to ensure safe operation.

BREAKING IN (RUNNING IN) ENGINE

Procedure and importance of the engine break-in period for longevity and performance.

STARTING ENGINE

Detailed steps and safety precautions for starting the outboard motor.

WARMING UP ENGINE

Instructions for warming up the engine to operating temperature before use.

SHIFTING

How to change gears (Forward, Reverse) safely and correctly.

STOPPING ENGINE

Procedures for safely stopping the outboard motor.

TRIMMING OUTBOARD MOTOR

How to adjust the outboard motor’s trim angle for optimal performance and handling.

CRUISING IN SHALLOW WATER

Procedures and precautions for operating the motor in shallow water.

TILTING UP/DOWN

How to tilt the outboard motor up or down for various purposes.

CRUISING IN OTHER CONDITIONS

Specific recommendations for operating in salt or turbid water.

MAINTENANCE

SPECIFICATIONS

Technical data and specifications for the outboard motor models.

TRANSPORTING AND STORING OUTBOARD MOTOR

Guidelines and precautions for safely transporting and storing the outboard motor.

PERIODIC MAINTENANCE

Schedule and procedures for regular maintenance tasks to ensure optimal performance.

MAINTENANCE CHART

Overview of maintenance tasks, intervals, and whether they can be done by the owner.

CLEANING AND ADJUSTING SPARK PLUG

Step-by-step guide for cleaning and adjusting spark plugs for optimal engine function.

TROUBLE RECOVERY

TROUBLESHOOTING

Diagnostic chart for common engine problems, possible causes, and remedies.

TEMPORARY ACTION IN EMERGENCY

Immediate steps to take in case of impact damage or other emergencies.

Related product manuals