Yamaha 4HP Outboard Motor 15 Inch Shaft
$930.00
The Yamaha 4HP Outboard Motor (F4SMHA) is a lightweight, portable 4-stroke outboard featuring a 15-inch short shaft, tiller steering, and manual start—ideal for small boats, tenders, and inflatables.
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Overview Yamaha 4HP Outboard Motor 15 Inch Shaft
The Yamaha 4HP Outboard Motor 15 Inch Shaft offers reliable, efficient power in a compact form factor designed for easy transport and storage. Built by Yamaha Marine, this single-cylinder 4-stroke outboard delivers smooth performance and proven durability for light-duty marine use.
Thanks to Yamaha’s Oil Retention System, the F4SMHA can be stored on its side without oil leaks, making it convenient for trailering and dockside handling. The integrated fuel tank keeps the setup clean and compact, with the option to connect an external tank for extended range.
Features and Performance
- Easy Storage: Oil Retention System allows on-side storage without leaks
- Comfortable Control: 180-degree steering with dampened twist-grip throttle
- Portable Design: Built-in carry handles and resting pads for easy transport
- Effortless Starting: Manual start with decompression system
- Efficient 4-Stroke Engine: Quiet, fuel-efficient, and low maintenance
Why You Should Buy it
The Yamaha F4SMHA is a smart choice for boaters who need dependable portable power with minimal weight. Its short shaft configuration is well-suited for small transoms, while Yamaha’s engineering ensures long-term reliability. Backed by a 3-year Yamaha manufacturer warranty, it’s a compact outboard you can trust.
| Specification | Details |
|---|---|
| Engine Type | Yamaha F4SMHA, 4-Stroke |
| Horsepower | 4 HP |
| Cylinders | 1 |
| Displacement | 139 cc |
| Fuel System | Carbureted |
| Shaft Length | 15 in (Short) |
| Steering | Tiller |
| Starting System | Manual |
| Trim & Tilt | Manual |
| Rotation | Standard |
| Full Throttle RPM | 4000 – 5000 rpm |
| Alternator Output | 6 amp |
| Fuel Tank | Internal (0.29 gal) |
| Weight | 59 lbs |
| Propeller | Aluminum |
| Warranty | 3-Year Manufacturer Warranty (Yamaha) |
- Yamaha 4HP Outboard Motor (Model F4SMHA)
- Aluminum Propeller (installed)
- Internal Fuel Tank (0.29 gallons)
- Owner’s Manual
Frequently Asked Questions About Yamaha 4HP Outboard Motor 15 Inch Shaft
How much charging support does Yamaha 4HP Outboard Motor 15 Inch Shaft provide?
The specification lists 6 amp alternator output for Yamaha 4HP Outboard Motor 15 Inch Shaft. That is a useful detail on a smaller outboard because it shows there is defined charging support alongside the engine’s portable or tiller-focused layout.
Can this small outboard be stored more easily between trips?
Yamaha highlights the Oil Retention System on this portable outboard, which allows side storage without oil leaks. That is a practical advantage for a small portable outboard that may be carried, laid down, or stowed between short trips, and the spec sheet also lists internal (0.29 gal).
What is this outboard mainly built for?
This portable outboard is described for small boats, tenders, and inflatables. Its tiller control, 15 in (Short) shaft, and compact 4 HP format keep the focus on straightforward boating rather than a complex helm setup.
How is this motor controlled and started?
This portable outboard is configured with a 15 in (Short) shaft, Tiller steering, Manual start, and Manual trim and tilt. That combination keeps everyday handling straightforward, whether the buyer is focused on hand-operated control, easier starting, or selecting the shaft length that matches the transom height shown in the listing.

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