Yamaha F250B User manual

F250B
Offshore, inshore, saltwater or fresh, today’s larger boats demand big power. At the same time,
today’s savvy consumers are demanding clean, quiet, fuel-efficient four stroke outboards; all in a
package that’s easy to operate and convenient to use. Tough to do? Not for Yamaha.
Yamaha has successfully integrated its highly-acclaimed Command Link®Digital Electronic
Control system with its reliable and long-proven F250 outboard. Feature packed with all the
innovation, reliability, and long-term value that are synonymous with Yamaha, this new outboard
offers the versatility, power, and convenience today’s boaters demand.
AVAILABLE
MODELS:
F250BTXR
LF250BTXR
F250BTUR
LF250BTUR
CONVENIENCE AND CONTROL
From its plug-and-play type installation to the smooth feel created through electronic
control of all throttle and shift functions, Yamaha’s new F250B is the perfect blend
of power, convenience, and control. Features like built-in multiple engine
synchronization, adjustable throttle friction and neutral detents, and built-in
redundancy systems make it the ideal engine with ideal control.
PERFORMANCE
The Yamaha F250B is a proven marine powerhouse built upon a
compact and lightweight 60-degree, 3.3 iter (204 c.i.) block. Its Variable
Camshaft Timing dramatically increases low and mid-range torque, for
surprising holeshot and mid-range throttle capabilities. A specially-
designed air intake system; coupled with proven Yamaha multi-point
electronic fuel injection; delivers, easy, instant starts, fast acceleration,
and maximum top end speed. An electronically-controlled single throttle
valve feeds individual long intake tracks, which dramatically improves hole
shot, acceleration, and mid-range performance. And, because it’s a Yamaha
four stroke outboard, you know it’s clean, quiet, smooth, and economical.
RELIABILITY/DURABILITY
Yamaha has taken the new F250B to the next level of reliability and durability,
by upgrading its corrosion protection package. Sharing the same special
powerhead painting process with its big brother, the Yamaha F350, now the
inside as well as the outside of the powerhead is protected with special
anti-corrosion paint using an advanced “electro-deposited” process. This helps
ensure longer engine life, even in the harshest environments, which means
more years of use, enjoyment, and peace of mind.
VALUE
Enhanced reliability. Exceptionally smooth and quiet performance. Outstanding fuel
economy. Maximum performance and convenience. All combine to make the new
Yamaha F250B an incredibly powerful value, both now and in the years ahead.
HOT SHEET
YAMAHA MARINE
Effective
July 1, 2008
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Effective
featuring
Command Link®Controls and Gauges**
** Command Link controls and gauges sold separately
to meet specific needs.

F250B Features
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F250B featuring Command Link®Controls and Gauges
F250B featuring Command Link®Controls and Gauges
Electronic Single
Throttle Valve
Reliability/Durability
Performance Convenience
Fuel Vapor
Reduction System
Large Water
Separator with
Water Sensor
Warning & Protection Systems
Enhanced Ultimate Corrosion Protection System
Serpentine Timing
Belt (Kevlar)
Multi-Point Electronic
Fuel Injection
Direct Coil-in-Cap
Ignition
Lubricant Coated
Strong Forged Piston
In-Bank™Exhaust
Tuned Long Track
Intake Manifold
Command Link
Digital Electronic
Controls
Location
Exchangeable
PTT Switch
Command Link
Gauges (square
or round)
F250B FEATURES

Smooth, Reliable Shifting and Throttle
CONVENIENCE AND CONTROL
By just pressing a button on the Command Link tachometer,
the operator can adjust the engine’s trolling speed from
600 ~ 1000 rpm, in 50-rpm increments. This helps provide
precise and consistent trolling speeds in a wide array
of conditions.
Command Link Digital Electronic Controls feature
automatic engine sychronization in twin and triple
engine configurations during normal cruise conditions.
It’s not only convenient, it helps maximize efficiency and
running performance.
Yamaha’s new Command Link Digital Electronic Control systems
are electronically-actuated, meaning there are no cables physically
moving. This greatly reduces shifting and throttle effort by
eliminating common cable friction. All Command Link Digital
Electronic Controls have adjustable throttle lever friction and
shifting detents, and feature critical system redundancy for
added reliability.
Precise Trolling Control
Choice of Control Style
Command Link Digital Electronic Controls come in a variety of
styles, including the new 6X7 concealed side-mount. They’re
also available in binnacle style for single, twin, and triple engine
applications; and all feature smooth, virtually effortless shifting
and throttle functions.
Automatic Engine Synchronization
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F250B featuring Command Link®Controls and Gauges
F250B featuring Command Link®Controls and Gauges

Advanced Technology
Second Station
Main Station
CONVENIENCE AND CONTROL
Command Link Digital Electronic Controls make dual station
installations easy and conveninent to use. They feature
‘plug-’n’-play’ water-resistant connections and simple-to-use
station selector switches and, since there’s no conventional
remote control cables, shifting and throttle functions are
a breeze.
Easy Dual Station Control
Engine exhaust is routed through a maze before exiting
above the waterline through the idle exhaust relief outlet,
for unbelieveably smooth and quiet operation.
Smooth and Quiet
All F250B models are equipped with an Engine Control
Module that interfaces with Yamaha Diagnostic System
software. This provides a view of selected past and current
running conditions, to help technicians provide a complete
and accurate diagnosis.
More Information
Command Link gauges offer a wealth of information to the
operator in order to help provide efficient and effective
operation. There’s even a combination Speedometer and
Fuel Management Gauge, to help conserve valuable
dash space.
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F250B featuring Command Link®Controls and Gauges
F250B featuring Command Link®Controls and Gauges

POWERFUL PERFORMANCE
Yamaha’s variable camshaft timing system advances and
retards the angle of the intake camshaft to dramatically
increase power and throttle response in the low- and
mid-rpm ranges. This gives the engine substantially greater
torque between 2000 ~ 3500 RPM to provide excellent
power to plane.
All air entering the engine block of the F250B is routed
through a single electronically-controlled throttle valve,
to ensure the precise amount of air necessary for optimum
power and fuel efficiency. The air silencer box reduces
intake noise and air turbulence for smooth, quiet operation.
Individual intake and exhaust camshafts provide more
precise valve timing control and have less moving parts
than conventional push rod systems for increased reliability.
This superior design also allows for use of 4 valves per
cylinder which exchange intake and exhaust gases more
efficiently for responsive power and increased fuel economy.
Reliable and Responsive
Hole Shot and Mid-Range Punch
Fuel Efficiency
Six individual compact electronic fuel injectors deliver the
exact amount of fuel needed for optimum performance and
economy. Controlled by the Engine Control Module via input
from an array of on-engine sensors, their location just above
the intake valves enhances fuel atomization, resulting in
more efficient combustion.
Precise Throttle Control
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F250B featuring Command Link®Controls and Gauges
F250B featuring Command Link®Controls and Gauges

RUGGED RELIABILITY
The F250B comes standard with dual pairs of water inlets,
for increased cooling efficiency. Located on the front and
both sides of the lower unit, each pair of pick-ups operate
independently of each other to provide proper water flow
in a wide variety of applications and conditions.
All F250B outboards feature a large, on-engine
water separating fuel filter with a water sensor. Used in
conjunction with Yamaha’s 10-Micron Water Separating
Fuel Filter, it helps separate water and contaminants from
the fuel before they can reach the outboard’s other filters
and fuel injectors.
Yamaha improved their legendary Ultimate Corrosion Protection
System for the F250B. Yamaha’s proprietary alloys, ACP-221
paint process, and freshwater flush device are just the start.
Multiple sacrificial anodes in and on the power head, mid-section,
and lower unit; a special electro-deposited paint process that
coats both the entire outside and the inside passages of the block
and cylinder heads; and a specially-painted and treated exhaust
system means better long-term protection and maximum value.
Long Term Value
Controlled Operating Termperature
Internal Protection from the Elements
The F250B features a proven cowling drain system, to easily
and efficiently drain away any water that enters the cowling
during normal engine operation. Incoming air is routed through
a labyrinth of passages that trap and drain water before it enters
the engine’s intake, for maximum reliability.
Cleaner Fuel
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F250B featuring Command Link®Controls and Gauges
F250B featuring Command Link®Controls and Gauges

System Diagram
Vapor
Water
Separator
Command Link
Speedometer
Fuel
Pump
Filter
Canister
Air
Fuel
Shift
Position
Sensor
Fuel
Vapor
Shut-Off
Valve
Cam Position Sensor
Crank Position Sensor
Intake Air Pressure Sensor
Oil Pressure Sensor
Engine Temperature Sensor
Intake Air Temperature Sensor
Knock Sensor
Cooling Water Pressure Sensor (Optional)
Over Water Speed Sensor (Optional)
Command Link
Digital Electronic Remote Control
Hub
Vapor Separator/
Fuel Injection Pump
Shift Actuator
Battery
Throttle
Position
Sensor
Ignition
Key Switch
Relief
Valve
ECU
Throttle Control
Ignition Control
Fuel Control
Variable Camshaft
Timing Control
Fuel Injector
VCT
Fuel Injector
IG Coil
Shift Control
GPS
ECM
(Variable Troll RPM Control)
Command Link
Concealed
Remote Control
(example)
Water Sensor
Command Link
Tachometer
VCT
IG Coil
(Optional,
customer-provided
compatible unit)
SYSTEM DIAGRAM
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F250B featuring Command Link®Controls and Gauges
F250B featuring Command Link®Controls and Gauges

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.
© 2008 Yamaha Motor Corporation
F250B Specifications
Model F250B / LF250B
Type Four Stroke, 24-Valve DOHC Direct-Action, 60° V6
Displacement 3352cc (204.6 c.i.)
Bore x Stroke 94.0 x 80.5mm (3.70 x 3.17 in)
Full Throttle RPM Range 5000 - 6000
Horsepower Rating at Propshaft 250 hp @ 5500 rpm (183.9kw @ 5500 rpm)
Compression Ratio 9.9:1
Fuel Induction/Scavenging DOHC / 24-valve with Variable Camshaft Timing
Alternator Output 46 Amp (38 Amp @ 1000 RPM)
Fuel Delivery Multi-point Electronic Fuel Injection
Starting Method Electric
Ignition TCI / 32-bit Micro-computer Control
w/ Direct “Coil-in-Cap” Ignition
Lubrication Wet Sump
Degree of Trim/Tilt -3 to +16/70°
Exhaust Through Propeller, Water-cooled, Labyrinth
Cooling Raw Water, Thermostatically-controlled
Rectifier/Regulator 3-phase, Water-cooled (standard)
Gear Ratio 2.0:1 (30/15)
Recommended Fuel Unleaded Gasoline (Minimum Pump Octane 89)
Recommended Oil Yamalube®4-M FC-W®10W-30 or 20W-40
Oil Capacity 5.9 Quarts (5.6L)
Remote Controls Command Link Digital Electronic Controls**
Command Link Gauges Required (square or round)**
Multiple Outboard Sychronization Auto Synch Throttle Control in Twin and
Triple Applications
Variable Trolling Throttle Adjustment +/- 50 RPM Increments (600 ~ 1000 RPM Range)
via Command Link
Steering Angle (maximum) 32° From Center (either direction)
Mounting Centers 28.5 inches
Weight (dry) 609 lbs.
Shaft Length 25” (X) / 30” (U)
C.A.R.B. Emissions Rating 3-Star
Limited Warranty 3-Year Pleasure, 3-Year Government,
1-Year Commercial
F250B SPECIFICATIONS
** Command Link controls and gauges sold separately
to meet specific needs.
F2
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F250B featuring Command Link®Controls and Gauges
F250B featuring Command Link®Controls and Gauges