The Yamaha 4HP is a lightweight 4-stroke engine designed for portability, performance, and peace of mind. With smooth power delivery, low emissions, and ultra-easy handling, it’s the perfect outboard for tenders, inflatables, or small utility boats — built for daily reliability.
IN ACTION
WATCH THE YAMAHA 4HP
Portable Performance
Discover the Yamaha 4HP — the portable outboard that brings together ease, power, and precision. With smooth four-stroke performance, effortless transport, and a trusted Yamaha build, it’s ready to go wherever your adventures take you — confidently and quietly.
4HP
Power That Travels Easy
When it comes to simplicity and strength, the Yamaha 4HP stands out. With a 139cc, single-cylinder 4-stroke engine, this outboard is compact yet delivers dependable performance and torque at low speeds. Weighing just 27 kg, it’s one of the lightest in its class — easy to carry, easy to store, and perfect for tenders, dinghies, or small boats. The PrimeStart™ ignition system makes starting smooth and consistent, while the shallow water drive ensures safe operation even near shorelines.
Built with Yamaha’s dedication to reliability, the 4HP includes wide-span engine mounts to reduce vibration, an integrated fuel tank for ease of use, and an optional external fuel connection for extended trips. The 360° steering feature makes maneuvering tight spaces effortless, and start-in-gear protection adds safety to every outing. Designed for quiet operation and minimal emissions, the 4HP is protected by Yamaha’s YDC-30 alloy and Phaze Five™ anti-corrosion system, ensuring long-term durability in all waters.
DETAILS
ABOUT 4HP
ENGINE
| ➢ CATEGORY | Portable (6 – 2.5hp) |
|---|---|
| ➢ ENGINE TYPE | 4-stroke |
| ➢ Displacement | 139 cc |
| ➢ No. of cylinders / Configuration | 1, OHV |
| ➢ Bore x stroke | 62.0 mm x 46.0 mm |
| ➢ Prop shaft output at mid range | 2.9 kW / 4,500 rpm |
| ➢ Full Throttle Operating Range | 4,000 – 5,000 rpm |
| ➢ Lubrication system | Wet sump |
| ➢ Fuel Induction System | 1-Carb |
| ➢ Ignition / advance system | CDI |
| ➢ Starter system | Manual |
| ➢ Gear ratio | 2.08 (27:13) |
DIMENSIONS
| ➢ Transom height | S435L:562mm |
|---|---|
| ➢ Weight with propeller | F4AMHS: 27.0 kg, F4AMHL: 28.0 kg |
| ➢ Fuel tank capacity | 1.1litres(Built-in fuel tank) or optional seperate fuel tank |
| ➢ Oil pan capacity | 0.6 L |
ADDITIONAL FEATURES
| ➢ Control | Tiller handle |
|---|---|
| ➢ Trim & Tilt method | Manual |
| ➢ Light coil / Alternator Output | 12V – 6A optional* |
| ➢ Propeller | Included |
| ➢ Remark | The kW data in this sheet is based on the ICOMIA 28 standard, measured at the prop shaft |
ELECTRIC-DRIVE TECHNICAL SPECS
| ➢ Digital Maximizer | No |
|---|---|
| ➢ Battery Meter | No |
PHOTOS
GALLERY
SERENITY
Go Light. Go Far.
The Yamaha 4HP is engineered for easy, relaxed boating. Its low weight and ergonomic carry handle make it effortless to lift, mount, and stow. Smooth operation is ensured by wide-span vibration-reduction mounts, while PrimeStart™ guarantees reliable, choke-free starts. You’ll enjoy the confidence of start-in-gear protection, shallow water drive, and simple 360° steering. Yamaha’s advanced YDC-30 anti-corrosion alloy keeps your engine running strong, season after season. Quiet, dependable, and easy to use — the 4HP is comfort in motion.
DESIGN
ENGINE
Don’t be fooled by its size — the 4HP is powered by Yamaha’s 4-stroke excellence. Its 139cc single-cylinder engine offers smooth, fuel-efficient performance and strong low-end torque. Whether cruising, docking, or exploring the shore, the manual tilt, shallow water drive, and 360° steering deliver precision and control. The integrated fuel tank makes it travel-ready, and the optional external connection extends your range. Yamaha’s ignition and combustion tech ensure smooth throttle response and reliable operation in all conditions.
WARRANTY
5 YEAR PROMISE
Enjoy Yamaha’s industry-leading limited warranty, offering up to 5 years of peace of mind. The 4HP is built to exacting standards with proven dependability. Whether you’re navigating calm bays or deep offshore waters, Yamaha’s legacy of excellence keeps you covered.
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