⚓ Marine Equipment Specialist: Yamaha Portable Series Authority.
Verified technical data for the F4 platform. This 139cc model is engineered for high-efficiency portable propulsion with a focus on low-vibration and ease of transport.
The Yamaha F4LMHA is a highly refined 139cc single-cylinder portable outboard that prioritizes ergonomic design and mechanical simplicity. Featuring a Manual Start and a long 20-inch shaft, this motor is an excellent choice for sailboats, inflatables, and small utility craft. It includes an integrated 1.1-liter fuel tank for maximum portability, while also offering an external fuel tank connection for extended range. Yamaha’s specialized Easy Storage System allows for three-way storage without oil leakage, a critical feature for researchers and recreational users alike.
Technical Specifications
| Manufacturer Part Number (MPN) |
F4LMHA |
| Engine Type |
4-Stroke, OHV 1-Cylinder |
| Displacement |
139 cc (8.5 ci) |
| Shaft Length |
20 Inches (Long Shaft) |
| Full Throttle RPM Range |
4000 - 5000 RPM |
| Starting System |
Manual (Rope) Start |
| Fuel System |
Carbureted (Single Venturi) |
| Dry Weight |
Approx. 61 lbs (28 kg) |
In The Box
- 1x Yamaha 4hp Outboard Motor (F4LMHA)
- 1x Integrated 1.1L Fuel Tank
- 1x Aluminum Propeller (Factory Installed)
- 1x Emergency Kill Switch Lanyard
- 1x Owner's Manual and Warranty Certification
Frequently Asked Questions
1. Can this engine be stored horizontally without damaging the oil system?
Yes. The F4LMHA features Yamaha's unique Three-Position Storage system. This engineering advancement prevents oil from entering the cylinder or leaking into the carburetor regardless of which side the motor is laid down on.
2. Does it include an alternator for battery charging?
No. The F4LMHA does not come with a charging system as standard. If electrical output is required for research electronics, an optional 6-Amp alternator kit must be installed separately.
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