⚓ Marine Equipment Specialist: Yamaha Portable Series Authority.
Verified technical data for the F4 platform. This 139cc short-shaft model is engineered for maximum portability and ergonomic handling for small craft.
The Yamaha F4SMHA is a 139cc single-cylinder portable outboard that represents the pinnacle of small-engine refinement. Designed with a 15-inch short shaft, it is perfectly suited for inflatable boats, tenders, and small utility skiffs. This Manual Start model features a built-in 1.1-liter fuel tank for "grab-and-go" convenience and a 180-degree steering radius for exceptional maneuverability. Yamaha's Oil Leak Prevention System allows for storage on either side or the front without the risk of oil entering the combustion chamber.
Technical Specifications
| Manufacturer Part Number (MPN) |
F4SMHA |
| Engine Type |
4-Stroke, OHV 1-Cylinder |
| Displacement |
139 cc (8.5 ci) |
| Shaft Length |
15 Inches (Short Shaft) |
| Full Throttle RPM Range |
4000 - 5000 RPM |
| Starting System |
Manual (Rope) Start |
| Fuel System |
Carbureted (Single Venturi) |
| Dry Weight |
Approx. 59 lbs (27 kg) |
In The Box
- 1x Yamaha 4hp Outboard Motor (F4SMHA)
- 1x Integrated 1.1L Internal Fuel Tank
- 1x Aluminum Propeller (Factory Installed)
- 1x Emergency Kill Switch Lanyard
- 1x Owner's Manual and Factory Warranty Packet
Frequently Asked Questions
1. Can this engine connect to an external fuel tank?
Yes. While it includes an internal 1.1L tank, the F4SMHA is equipped with a two-way fuel valve and an external connector, allowing for a quick switch to a larger portable fuel tank for extended range.
2. What is the significance of the 139cc displacement in this class?
The 139cc engine is one of the largest in the 4hp class, providing high torque at lower RPMs. This allows the motor to maintain plane on small vessels more easily than smaller-displacement competitors.
Marine Equipment Specialist | Yamaha Marine Specialist | Genuine Provider
