#Year-2021|Model-F4smha
Our 139-cc 4-hp portable outboard mirrors our OHV F6, with a couple less horses. It features the same ergonomic, easy-grip starter handle with a built-in decompression device for effortless starts. The F4 also features a built-in fuel tank with the option of switchable access to an additional external tank for amazing extended range. There’s no stopping this little brute.
Features:
- Only 60 pounds
- Shaft Length - 15"
- Solid 6-amp alternator
- Manual Start Only
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.
Maximum Efficiency
The F6, F4 and F2.5 have a carburetor with a factory-selected setting for maximum efficiency. Additionally, automatic decompression, built-in auxiliary priming and start-in-gear prevention help make for easier starts.
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.
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.
Surprising Performance
The portable F6, F4 and F2.5 all offer impressive features like electronic ignition, thermostatic cooling and 180-degree steering.
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.
| Weight † |
27 kg (60 lbs) - 28 kg (61 lbs) |
| Full Throttle RPM Range |
4000 ~ 5000 |
| Fuel Induction System |
Carb |
| Recommended Engine Oil |
Yamalube® 4M (See owner's manual) |
| Engine Type |
1 cyl |
| Displacement |
139cc |
| Bore x Stroke |
62 x 46mm (2.44 x 1.81in) |
| Prop Shaft Horsepower |
4hp at 4500 rpm |
| Alternator Output at W.O.T. |
6 Amp |
| Compression Ratio |
8.9:1 |
| Recommended Fuel |
Octane 87 |
| Recommended Fuel Filtration |
N/A |
| C.A.R.B. Rating |
3-Star |
| Exhaust |
Above Propeller |
| Intake |
2 |
| Ignition |
CDI |
| Spark Plug |
CR6HSB |
| 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 |
69° |
| Degree of Trim |
-4° through +16° |
| Mounting Centers |
N/A |
| Steering |
Tiller |
| Steering Angle (maximum) |
90° from center, either direction |
| Warranty |
Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial |
#Year-2022|Model-F4smha
Our 139-cc 4-hp portable outboard mirrors our OHV F6, with a couple less horses. It features the same ergonomic, easy-grip starter handle with a built-in decompression device for effortless starts. The F4 also features a built-in fuel tank with the option of switchable access to an additional external tank for amazing extended range. There’s no stopping this little brute.
Features:
- Only 60 pounds
- Shaft Length - 15"
- Solid 6-amp alternator
- Manual Start Only
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.
Maximum Efficiency
The F6, F4 and F2.5 have a carburetor with a factory-selected setting for maximum efficiency. Additionally, automatic decompression, built-in auxiliary priming and start-in-gear prevention help make for easier starts.
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.
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.
Surprising Performance
The portable F6, F4 and F2.5 all offer impressive features like electronic ignition, thermostatic cooling and 180-degree steering.
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.
| Weight † |
27 kg (60 lbs) - 28 kg (61 lbs) |
| Full Throttle RPM Range |
4000 ~ 5000 |
| Fuel Induction System |
Carb |
| Recommended Engine Oil |
Yamalube® 4M (See owner's manual) |
| Engine Type |
1 cyl |
| Displacement |
139cc |
| Bore x Stroke |
62 x 46mm (2.44 x 1.81in) |
| Prop Shaft Horsepower |
4hp at 4500 rpm |
| Alternator Output at W.O.T. |
6 Amp |
| Compression Ratio |
8.9:1 |
| Recommended Fuel |
Octane 87 |
| Recommended Fuel Filtration |
N/A |
| C.A.R.B. Rating |
3-Star |
| Exhaust |
Above Propeller |
| Intake |
2 |
| Ignition |
CDI |
| Spark Plug |
CR6HSB |
| 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 |
69° |
| Degree of Trim |
-4° through +16° |
| Mounting Centers |
N/A |
| Steering |
Tiller |
| Steering Angle (maximum) |
90° from center, either direction |
| Warranty |
Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial |
#Year-2022|Model-F4lmha
Our 139-cc 4-hp portable outboard mirrors our OHV F6, with a couple less horses. It features the same ergonomic, easy-grip starter handle with a built-in decompression device for effortless starts. The F4 also features a built-in fuel tank with the option of switchable access to an additional external tank for amazing extended range. There’s no stopping this little brute.
Features:
- Shaft Length - 20"
- Solid 6-amp alternator
- Manual Start Only
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.
Maximum Efficiency
The F6, F4 and F2.5 have a carburetor with a factory-selected setting for maximum efficiency. Additionally, automatic decompression, built-in auxiliary priming and start-in-gear prevention help make for easier starts.
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.
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.
Surprising Performance
The portable F6, F4 and F2.5 all offer impressive features like electronic ignition, thermostatic cooling and 180-degree steering.
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.
| Weight † |
27 kg (60 lbs) - 28 kg (61 lbs) |
| Full Throttle RPM Range |
4000 ~ 5000 |
| Fuel Induction System |
Carb |
| Recommended Engine Oil |
Yamalube® 4M (See owner's manual) |
| Engine Type |
1 cyl |
| Displacement |
139cc |
| Bore x Stroke |
62 x 46mm (2.44 x 1.81in) |
| Prop Shaft Horsepower |
4hp at 4500 rpm |
| Alternator Output at W.O.T. |
6 Amp |
| Compression Ratio |
8.9:1 |
| Recommended Fuel |
Octane 87 |
| Recommended Fuel Filtration |
N/A |
| C.A.R.B. Rating |
3-Star |
| Exhaust |
Above Propeller |
| Intake |
2 |
| Ignition |
CDI |
| Spark Plug |
CR6HSB |
| 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 |
20" |
| Degree of Tilt |
69° |
| Degree of Trim |
-4° through +16° |
| Mounting Centers |
N/A |
| Steering |
Tiller |
| Steering Angle (maximum) |
90° from center, either direction |
| Warranty |
Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial |
