Yamaha FT25B - User Manual

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F20A

F25A

FT25B

OWNER’S MANUAL

MANUEL D’UTILISATION

MANUAL DEL PROPIETARIO

65W-28199-77

GB

F

ES

65W-9-77 Hyoshi (1-3) 4/18/02 3:14 PM Page 1 (2,1)

Table of Contents

Questions and Answers

R
rogersdanAug 10, 2025
What to do if my Yamaha FT25B Outboard Motor engine will not start?
- M
  Monique MorenoAug 10, 2025
  If your Yamaha Outboard Motor engine won't start but the starter is operating, several factors could be at play. First, ensure the fuel tank isn't empty and that you're using clean, fresh fuel. A clogged fuel filter could also be the culprit, so try cleaning or replacing it. Make sure you are following the correct starting procedure. Other potential issues include fouled or incorrect spark plugs (inspect, clean, or replace them), incorrectly fitted spark plug caps (check and refit), poor ignition wiring connections (check for wear, tighten, or replace wires), a missing engine stop switch lanyard (attach it), or damaged internal engine parts or fuel pump malfunctions, which would require servicing by a Yamaha dealer.
S
Steven KingAug 15, 2025
Why is the warning buzzer sounding on my Yamaha FT25B Outboard Motor?
- E
  Edward WardAug 15, 2025
  If the warning buzzer sounds or the indicator lamp lights on your Yamaha Outboard Motor, it could be due to several reasons. Check the water intake for any restrictions, as the cooling system might be clogged. Ensure the engine oil level is adequate and that you're using the specified engine oil. Also, the spark plug's heat range might be incorrect, so inspect and replace it if necessary. Other potential causes include contaminated or deteriorated engine oil (replace it), a clogged oil filter, or improperly distributed load on the boat (distribute the load evenly). For issues like a faulty water pump/thermostat or oil feed/injection pump malfunctions, it's best to have it serviced by a Yamaha dealer.
C
Courtney ChandlerAug 20, 2025
How to fix a Yamaha Outboard Motor when the starter will not operate?
- D
  Dr. Jennifer DennisAug 20, 2025
  If your Yamaha Outboard Motor's starter 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 functioning. Next, inspect the battery connections for looseness or corrosion; tighten the cables and clean the terminals if needed. Also, verify if the fuse for the electric start circuit is blown and replace it with the correct amperage after identifying and fixing the cause of the overload. Ensure 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.
A
Andrea WrightSep 4, 2025
What causes a Yamaha FT25B Outboard Motor to vibrate excessively?
- J
  jasonarnoldSep 4, 2025
  Excessive vibration in your Yamaha Outboard Motor can be caused by a damaged propeller, which should be repaired or replaced. Alternatively, the propeller shaft could be damaged, requiring service by a Yamaha dealer. Check for weeds or foreign matter tangled on the propeller and remove them. Ensure the motor mounting bolts are tightened. If the steering pivot is loose or damaged, tighten it or have it serviced by a Yamaha dealer.
T
Timothy WalkerNov 24, 2025
Why is my Yamaha FT25B Outboard Motor losing power?
- C
  Colton DunnNov 25, 2025
  Loss of power in your Yamaha Outboard Motor can stem from various causes. Start by checking the propeller for damage and have it repaired or replaced if necessary. Ensure the propeller pitch and diameter are correct for optimal speed. Adjust the trim angle for efficient operation and verify that the motor is mounted at the correct height on the transom. Also, inspect for marine growth on the boat bottom and clean it. Other potential issues include fouled or incorrect spark plugs (inspect, clean, or replace them), weeds tangled on the gear housing (remove them), obstructions in the fuel system (check for pinched lines), a clogged fuel filter (clean or replace it), contaminated fuel (use fresh fuel), incorrect spark plug gap (inspect and adjust), poor ignition wiring (check and repair), or t...
H
Heidi MasonDec 1, 2025
What causes a Yamaha FT25B to idle irregularly?
- D
  Dylan FordDec 1, 2025
  An Yamaha Outboard Motor that idles irregularly or stalls can be attributed to several factors. Begin by inspecting the spark plugs for fouling or incorrect type and clean or replace them as needed. Check the fuel system for any obstructions, such as pinched or kinked lines. Ensure the fuel is clean and fresh, and the fuel filter isn't clogged. Also, verify the spark plug gap is correct and the ignition wiring is in good condition. Make sure the air vent screw on the fuel tank is open, the motor angle is correct, and the fuel joint connection is properly connected. If the issue persists, it may be due to failed ignition parts, incorrect carburetor adjustments, a damaged fuel pump, a faulty thermostat, or a clogged carburetor, all of which require servicing by a Yamaha dealer. Additionally,...

Yamaha FT25B Specifications

General

Engine Type	4-stroke, SOHC
Fuel System	Carburetor
Gear Ratio	2.08:1
Starting System	Manual
Full Throttle RPM Range	5000 - 6000 rpm
Displacement	432cc
Max Output	25 hp
Bore x Stroke	65 mm x 65.1 mm (2.56 in x 2.56 in)
Shaft Length	15 in, 20 in
Oil Capacity	1.1L
Fuel Type	Unleaded Gasoline

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