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1998 Egret C/K 167
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Yamaha F40: Fuel Injection for the Frugal

Amelia Island, Fla., May 12, 2008 —Yamaha announced today a new 40-horsepower four-stroke midrange outboard, internally called the F40A, which will run more efficiently and reliably thanks to the addition of electronic multi-point fuel injection and other improvements from Yamaha’s engineers.  

“These outboards are used for every kind of duty imaginable,” said Phil Dyskow, Yamaha Marine Group President. “Whether used on a skiff, a jon boat, an inflatable or a small pontoon, the new F40 will provide value, economy and performance.”

Featuring a new low-profile design, the F40 builds upon Yamaha’s proven three-cylinder, overhead-camshaft four-stroke powerhead.  

The new outboard features an electronic multi-point fuel injection system that works in conjunction with an electronically-controlled single throttle valve, long intake track manifold and 32-bit electronic control module. Together these components optimize efficiency while providing easy starts, quiet performance and smooth, precise throttle control.

Thanks to its new engine control system, the F40 can be rigged with optional Yamaha Command Link® gauges, which can increase customer convenience and control. For example, Command Link features Yamaha’s Variable Trolling RPM (VTS™) switch. With VTS anglers can adjust trolling speed in 50 rpm increments. The F40 can also be rigged with Yamaha’s innovation award- winning Multifunction Tiller Handle.

The F40’s new engine control module also interfaces with Yamaha Diagnostic System (YDS) software to help technicians provide a quick, complete and accurate diagnosis if trouble occurs.

Also under the F40’s sleek, new cowl is built-in water separating fuel filter with a water sensor.  When used in conjunction with Yamaha’s mini-10™ fuel filter, the F40 gets the same kind of protection Yamaha’s larger outboards have enjoyed when equipped with Yamaha’s external 10-Micron Water Separating Fuel Filter.


Model • F40A
Type • Four-Stroke, 6-Valve SOHC, In-Lind 3-Cylinder
Displacement • 747cc (45.6 c.i.)
Bore x Stroke • 65.0mm x 75.0mm (2.56 in. x 2.95 in)
Full Throttle RPM Range • 5000-6000
Horsepower Rating at Propshaft • 40 hp @ 5500 rpm (29.4kw @ 5500 rpm)
Compression Ratio • 9.4:1
Fuel Induction/Scavenging • Electronic Fuel Injection
Alternator Output • 12V-16 Amp with Rectifier/Regulator (standard)
Fuel Delivery • Electronic Fuel Injection
Starting Method • Electric Starter
Ignition • TCI Micro-computer
Spark Plug • NGK(r)DPR6EA-9
Lubrication • Wet Sump
Degree of Trim/Tilt • -3 to +16/63° w/ PTT (62° w/ Hydro-Assist Manual Tilt
Exhaust • Through Propeller Hun
Cooling • Raw Water, Thermostatically-controlled
Gear Ratio • 2.0:1 (26/13)
Recommended Fuel • Unleaded Gasoline (Minimum Pump Octane 87)
Recommended Oil • Yamalube(r) 4-M FC-W(r)10W-30 or 20W-40
Oil Capacity • 2.1 Quarts (2.0L)
Remote Controls • Optional Conventional Remote Controls (Yamaha Brand recommended)
Command Link Gauges • Optional (square or round)
Variable Trolling Throttle Adjustment • +/- 50 RPM Increments (650~900 RPM Range)
Steering System • Yamaha Multifulctional Tiller Handle or Remote Steering Control
Steering Angle • (maximum) 40° Each Direction
Weight (dry) • Est. 219 lbs.
Shaft Length • 20" (L) - Propeller Models, 15" (S) - Jet Models (for use on 20" transoms
C.A.R.B. Emissions • Rating 3-Star
Limited Warranty • 3-Year Pleasure, 3-Year Government, 1-Year Commercial

Yamaha Marine products are marketed throughout the United States and around the world. Yamaha Marine Group, based in Kennesaw, Ga., supports its 2,200 U.S. dealers and OEM partners with marketing, training and parts for Yamaha's full line of products and strives to be the industry leader in reliability, technology and customer service. Yamaha Marine is the only outboard brand to have earned NMMA(r)'s C.S.I. Customer Satisfaction Index award every year since its inception. Visit

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.

Martin Peters Anna Masters
Manager, Communications     Communication Specialist
Yamaha Marine Group Yamaha Marine Group
(678) 763-2583 (404) 242-8804

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