Yamaha F25SMHA series User manual

F25 •T25
Performance. Fuel Efficiency. Reliability. Convenience. Long-term value.
AVAILABLE
MODELS:
F25SMHA**
F25SEHA**
F25SEA**
F25LMHA**
F25LEHA**
F25LEA**
F25LA**
T25LA**
These are the benefits Yamaha constantly strives to provide in every outboard we make. Continuing
this innovative tradition Yamaha is proud to announce the newest additions to our mid-range outboard
family, the four stroke F25 and four stroke, high thrust T25.
PERFORMANCE
Our marine-specific, two-cylinder, single overhead camshaft design features a new cylinder
block and head for enhanced durability and economical power in a compact package.
A new streamlined cowling coupled with a tuned long intake track manifold and
our PrimeStart™ system mean outstanding fuel-efficiency with easy starting, fast
acceleration, and excellent top-end speed. Available in both standard and
high-thrust models.
RELIABILITY
Yamaha’s proven design features advanced technology like
new electrical components and a new micro-computer controlled
ignition system. In addition, new pistons, connecting rods, and valves mean
greater strength for added reliability. Add a spin-on oil filter, integral engine
monitoring and warning system and Yamaha’s renowned Ultimate Corrosion
Protection System, and you have the features to help provide the peace
of mind that comes standard with every Yamaha outboard.
CONVENIENCE AND CONTROL
Yamaha’s F25 and high-thrust T25 offer the ultimate in convenience and control
in a wide range of applications; all in a compact, easy-to-own-and-operate package.
All models feature our Long Span Mounting System, helping to reduce vibration for
smoother operation. Standard tiller handle models have an improved handle featuring
greater strength and improved comfort. The high-thrust version T25 features a standard
Dual Thrust™ propeller, a larger lower unit with a high 2.42:1 gear ratio, electric start,
power trim and tilt, and remote control; making it ideal power for heavy loads like
small pontoons, sailboats, and work boats.
VALUE
Yamaha reliability. Exceptionally smooth and quiet operation. Outstanding fuel efficiency.
Maximum performance and convenience. A 3-year pleasure use limited warranty, with a new
CARB 3-star rating. Yamaha’s new F25 and T25 are incredibly powerful and versatile values.
HOT SHEET
YAMAHA MARINE
Effective
February 12, 2009
**New Model Codes - F25 •T25
Example
F/T 25 L E H A
Fuel Induction/ Horsepower Shaft Starting Method Control Generation
Engine Type Length PTT Method
F = Four Stroke S = 15” Blank = PTT & E start Blank = Remote A = 1st change on motor
T = High Thrust L = 20” P = PT & E start Control B = 2nd change on motor
Four Stroke X = 25” E = Electric start H = Tiller Handle C = 3rd change on motor
U = 30” M = Manual start C = Command Link Etc.
J = Jet Control
Due to Yamaha’s ongoing commitment to product improvement, we reserve the right to change without notice,
equipment, materials, or specifications.

F25 •T25 Features
Over-Rev
Limiter
Over-Heat
Warning
Warning & Protection
Anti-Corrosion System
Low Oil
Pressure
Warning
Start-In-Gear
Prevention
Shift-Into-Gear
Prevention at
Open-Throttle
Alumite
Treatment
Exhaust
Freshwater
Flushing Device
Special Aluminum
Alloy: YDC30
Blow-By Gas
Re-Burning System
Long-Span
Mounting System
Anti-Splash Plate
(T25)
Water Draining
Air Intake Duct
Compact/One-Piece
Solid Cowling
Self-Sacrificing
Anodes
Counter Balancer
PrimeStart™ and
Acceleration Pump
Micro-Computer
Controlled Ignition
Auto Decompression
(Manual Start Models)
Streamlined
Tuned Intake Manifold
Advanced Cylinder
Block and Head
Labyrinth Exhaust
Waist Drive Shaft
(T25)
Strong Tiller Handle
with Front Shift (F25)
Water-Sealed
Outer Wall
13 Amp Alternator**
2.42 High Gear Ratio
(T25)
Dual Thrust Propeller
(T25)
Reliability/Durability
Performance Convenience
Stop Switch on
Tiller Handle (F25)
Single Operation
Steering Friction
Power Trim and Tilt
(F25LA, T25LA, and
F25LA Multi-Function
Tiller)
Multi-Function
Tiller Handle
(F25LA: Optional)
NEW
NEW
T25F25
NEW
NEW
NEW
Strong pistons,
rods, and valves (F60)
NEW
NEW
NEW
NEW
Re-shaped Lower
Engine Mount
(F25S models)
NEW
NEW
F25 •T25 FEATURES
F25 •T25 HOT SHEET
F25 •T25 HOT SHEET
**Manual Start models require optional rectifier/regulator. See dealer for details.

POWERFUL PERFORMANCE
F25 •T25 HOT SHEET
F25 •T25 HOT SHEET
Smooth and Quiet
: Exhaust
Engine exhaust is routed through a maze before
exiting above the waterline through the idle
exhaust relief outlet for unbelievably smooth
and quiet operation.
Greater Reliability
New electronics and a new micro-computer
controlled ignition system mean dependable
starting and consistent power, while an advanced
air intake system drains away any water that
enters the cowling during normal engine operation
for long-term reliability.
Responsive, Fuel-Efficient Power
A streamlined intake manifold uses long
tracks and smoother airflow, for reliable
and responsive power with outstanding
fuel efficiency.
: Air
: Fuel
: Mixture
Turn-Key Starting
Yamaha’s PrimeStart™ system is standard on
F25 and T25 models, for dependable turn-key
starting in either hot and cold conditions.
Choice of Controls
Tiller handle models feature improvements in
strength and operator comfort, with stronger
internal components and an improved grip.
Our Multi-Function Tiller Handle is also available
on remote control F25 models.
Improved Durability
A proven 498cc two-cylinder, SOHC design
features a new cylinder block and head.
The pistons, connecting rods, and valves are
the same as used in its F60 big brother, for
added strength, responsive power and excellent
fuel efficiency in a compact package.
Multi-Function Tiller Handle
(Optional: F25 remote models)

This document contains many of Yamaha’s valuable trademarks. It may also contain trademarks belonging to other companies. Any references to other companies or their products
are for identification purposes only, and are not intended to be an endorsement.
Due to Yamaha’s ongoing commitment to product improvement, we reserve the right to change without notice, equipment, materials, or specifications.
Remember to always observe all applicable laws. Never drink and drive. Dress properly with a USCG-approved personal floatation device and protective gear.
©2009 Yamaha Motor Corporation, U.S.A. All rights reserved.
F25 •T25 Specifications
Model F25
•T25
Model Types F25SMHA, F25SEHA, F25SEA, F25LMHA,
F25LEHA, F25LEA, F25LA and T25LA
Shaft Length S: 15", L: 20"
Engine Type Four-Stroke, 4-Valve SOHC, In-Line 2-Cylinder
Displacement 498cc (30.4 c.i.)
Bore x Stroke 65.0 mm x 75.0 mm (2.56 x 2.76 in)
Horsepower Rating at Propshaft 25 hp @ 5500 rpm (18.5kw @ 5500 rpm)
Full Throttle RPM Range 5000 ~ 6000 rpm
Compression Ratio 9.4:1
Idling Engine Speed 975 ± 50 rpm
Fuel Induction System 1-Carb with Acceleration Pump
Alternator Output 12V-13.5 Amp with Rectifier Regulator
Starting Method Manual Starter or Electric Starter
Starting System PrimeStart™
Ignition System CDI Micro-computer
Spark Plug NGK®DPR6EA-9
Lubrication Wet Sump
Engine Oil Capacity 1.7 Quarts (1.6L)
Trim & Tilt Manual w/2-position Shallow Water Drive*
or Power Trim and Tilt
Exhaust System Through Propeller Hub
Cooling Raw Water, Thermostatically-controlled
Gear Ratio F25: 2.08:1 (27/13) •T25: 2.42:1 (29/12)
Recommended Oil Yamalube®4-M FC-W®10W-30 or 20W-40
Recommended Fuel Regular Unleaded Gasoline (Minimum Pump Octane 87)
Steering System Standard Tiller Handle or Remote Control,
or Optional Multi-Function Tiller Handle
Steering Angle F25: 42° Each Direction •T25: 40° Each Direction
Weight (dry) F25 models: 170 ~ 181 lbs
T25 model: 203 lbs
C.A.R.B. Emissions Rating 3-Star
Limited Warranty 3-Year Pleasure
3-Year Government
1-Year Commercial
F25 •T25 SPECIFICATIONS
F25 •T25 HOT SHEET
F25 •T25 HOT SHEET
*Shallow Water Drive positions exclude “full up” and “full down” settings.

F25 •T25 HOT SHEET
F25 •T25 HOT SHEET
25MSH
F25
26.0 mph
@ 6117 rpm
28.85 mph
@ 5978 rpm
28.65 mph
@ 6015 rpm
Top Speed
F20
25MSH
F25
10.70 sec.
8.09 sec.
9.02 sec.
Acceleration 200
F20
25MSH
F25
15.40 mpg
@ 5000 rpm
13.04 mpg
@ 4500 rpm
14.57 mpg
@ 4500 rpm
Cruise Economy
F20
25MSH
F25
13.05 mpg
@ 6117 rpm
8.80 mpg
@ 5978 rpm
10.99 mpg
@ 6015 rpm
WOT Fuel Economy
F20
F25
10 amps
6 amps
13 amps
Test Boat Specifications
Boat:
Length:
Beam:
Fuel:
Boat Hull Test Weight:
G3 Guide V14
14 6"
61"
6 gallons
200 lbs.
25MSH
F25
Charging Output
F20
25%
better than
our
2-stroke
G3 Guide V14
25MSH
F25
24.75 mph
@ 6054 rpm
27.15 mph
@ 5828 rpm
27.55 mph
@ 5957 rpm
Top Speed
F20
25MSH
F25
12.18 sec.
8.91 sec.
9.67 sec.
Acceleration 200
F20
25MSH
F25
14.15 mpg
@ 5500 rpm
11.56 mpg
@ 4500 rpm
12.96 mpg
@ 5000 rpm
Cruise Economy
F20
25MSH
F25
13.22 mpg
@ 6054 rpm
8.41 mpg
@ 5828 rpm
11.01 mpg
@ 5957 rpm
WOT Fuel Economy
F20
25MSH
F25
10 amps
6 amps
13 amps
Charging Output
F20
Test Boat Specifications
Boat:
Length:
Beam:
Fuel:
Boat Hull Test Weight:
G3 Eagle 145 PF
13 10"
70"
6 gallons
450 lbs.
31%
better than
our
2-stroke
G3 Eagle 145 Panfisher
PERFORMANCE COMPARISONS

F25 •T25 HOT SHEET
F25 •T25 HOT SHEET
Notice: The performance comparisons listed herein are prepared by Yamaha application engineers. Information and data contained herein is approximate
and subject to many different factors and variables. This data is provided as a guideline only, and, while useful for comparison purposes between different
models, it should not be relied upon as representative of actual performance. Due to various factors, including your boat’s actual weight and wind and
water conditions, your boat’s performance may be different that the information contained herein. Consumers, please confirm the specifications and
performance data of your specific boat/engine combination with your dealer prior to purchase.
Yamaha reserves the right to change the specifications and performance data of these engines without notice.
Top Speed Cruise Economy
WOT Fuel Economy
25MLH
F25
6 amps
13 amps
Charging Output
Test Boat Specifications
Boat:
Length:
Beam:
Fuel:
Boat Hull Test Weight:
G3 Cruise 18 Pontoon
18 0"
96"
30 gallons
1,620 lbs.
T25LA
8.25"pitch
9"pitch
Yamaha Dual Thrust™ Prop
25MLH
T25LA
10.61 mph
@ 5021 rpm
12.05 mph
@ 5178 rpm
25MLH
T25LA
17.18 sec.
15.28 sec.
Acceleration 200
25MLH
F20
T25LA
5.34 mpg
@ 3500 rpm
7.03 mpg
@ 3500 rpm
25MLH
F20
T25LA
3.88 mpg
@ 5021 rpm
5.08 mpg
@ 5178 rpm
25MLH
12%
better than
our
2-stroke
31%
better than
our
2-stroke
14%
better than
our
2-stroke
32%
better than
our
2-stroke
G3 Cruise 18 Pontoon
PERFORMANCE COMPARISONS