Yamahas smallest Portables, the F6, F4 and F2.5, weigh in at as little as 37 pounds, with streamlined overhead-valve, one-cylinder designs. Their light weights, combined with built-in carrying handles, resting pads and an oil-leak prevention system for on-side storage capability create true portability. Add to that their efficiency, performance and reliability and these pint-sized powerhouses are perfect for all sorts of light duty, like hopping to the cuddy on a tender. Wherever the day takes you, you can take along a little extra power with an F6, F4 or F2.5 Yamaha Portable.
Power & Performance
Lightweight, Portable Power: They may weigh as little as 37 pounds, but these Overhead-Valve portable outboards are packed with features that create smooth, quiet power. This includes a CDI or TCI ignition system, an optimally balanced crankshaft, a long span mounting system and a labyrinth exhaust.
Ultra-Low Emissions: The Portable F6, F4 and F2.5 are California Air Resources Board (C.A.R.B.) Three-Star Rated for Ultra-Low Emissions and meet federal EPA requirements.
Record Setting Fuel Efficiency: Small motors use less fuel, but according to the Guinness Book of World Records, the Yamaha F4 actually set a world record for fuel efficiency, traveling 67.27 continuous statute miles on one gallon of gas.
Reliability & Durability
Easy Operation: The F6, F4 and F2.5 feature built-in, see through fuel tanks. The F6 and F4 also feature switchable access to an optional, 3.1-gallon external fuel tank for extended range.
Wet Sump: A pressurized oil delivery system that incorporates a compact and durable oil pump to keep all of the moving parts of their Overhead Valve systems lubricated and running smoothly for maximum reliability.
Corrosion Protection: Combined with our proprietary alloy (YDC-30), our exclusive Phaze Five electro-deposited, anti-corrosive paint system provides a tough, five-layer barrier against corrosion. This protection is standard on all Yamaha Portable outboards.
Maximum Efficiency: The F6, F4 and F2.5 have a carburetor with a factory-selected setting for maximum efficiency, which helps them achieve a C.A.R.B. Three-Star Rating for Ultra-Low Emissions. Additionally, automatic decompression, built-in auxiliary priming and start-in-gear prevention help make for easier starts.
Convenience & Control
Easy Storage: Yamahas F2.5, F4, and F6 feature our Easy Storage Oil Retention System. This pressurized oiling system prevents leaks, enabling on-side storage.
Comfortable Control: Incredibly nimble, the F6 and F4 feature 180-degree steering and the F2.5 features 360-degree steering with a dynamically balanced and dampened twist-grip throttle for comfort and convenient maneuverabilty.
Portability and Storage: Built-in front and rear handles make these lightweights easy to carry. Resting pads and an easy oil retention system allow for convenient on-side storage without cowling scuffs or oil leakage.
Model Specific Features
Our 139-cc 6-hp portable is an impressive little outboard. It boasts surprising features for such a small motor, like labyrinth exhaust and a long span mounting system for smooth, quiet power. It also offers the convenience an external fuel tank (in addition to its built-in tank) for extended range and added convenience.
Tiller-handle control with forward-neutral-reverse shifting and an ergonomic twist-grip throttle
Only 59 pounds (15 shaft model)
Available in 15 and 20 shaft lengths
Solid 6-amp alternator (optional)
Engine Type: 1 cyl
Bore x Stroke: 62 x 46mm (2.44 x 1.81in)
Prop Shaft Horsepower: 6hp at 5000 rpm
Full Throttle RPM Range: 4500 ~ 5500
Alternator Output at W.O.T.: 6 Amp
Compression Ratio: 8.9:1
Fuel Induction System: Carb
Weight*: 27 kg (59 lbs)
Recommended Fuel: Octane 87
Recommended Engine Oil: Yamalube 4M (See owner's manual)
Recommended Fuel Filtration: N/A
C.A.R.B. Rating: 3-Star
Exhaust: Above Propeller
Spark Plug: CR6HSB
Alternator Output: 6 Amp
Starting System: Manual
Lubrication: Wet Sump
Engine Oil Capacity: 0.6L
Recommended Cooling: Thermostatic Control
Ethanol Blend Limit: 10% Maximum
Gear Ratio: 2.08:1
Gear Shift: Forward, Neutral, Reverse
Shaft Length: 15"
Degree of Tilt: 69Â°
Degree of Trim: -4Â° through +16Â°
Dry Weight: 15" shaft / 27 kg (59 lbs)
Mounting Centers: N/A
Steering Angle (maximum): 90Â° from center, either direction
Warranty: Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial
Weight refers to shortest shaft length, and is measured without motor oil, gearcase oil and propeller (except models 25 hp and under, which include a standard propeller). All Jet model weights include the jet pump assembly (weight estimated).