Yamaha Outboards 4HP | F4SMHA

Yamaha F4SMHA 4 HP Four-Stroke Outboard: More Power, Still Ultra-Portable

The Yamaha Outboards 4HP | F4SMHA.

Are you looking for a lightweight, compact, and highly reliable outboard with a bit more thrust than smaller portables? Do you need a motor that’s easy to start, store, and transport, while offering excellent four-stroke efficiency and the flexibility of an internal or external fuel tank?

Shop the Yamaha F4SMHA 4HP 4-stroke outboard with 15″ shaft, manual start, and tiller handle. Features 59lbs design, integrated/external fuel tank option & on-side storage. Ideal for tenders, small boats, canoes. Reliable & efficient.

The Yamaha F4SMHA 4 HP Four-Stroke Outboard Motor is an excellent choice for a variety of small boats, tenders, and other light-duty applications where a combination of portability and increased power is desired.

Indeed, the F4SMHA builds upon the successful portable platform, offering 4 horsepower in a convenient 15-inch short shaft configuration. Crucially, it features a manual start and a tiller handle for direct, intuitive control. Moreover, despite its increased power, it remains remarkably light at around 59-60 pounds (27 kg), incorporating Yamaha’s clever oil retention system for leak-free, on-side storage. Furthermore, it uniquely offers the convenience of a built-in fuel tank with the option to switch to an external tank for extended range. Ultimately, the F4SMHA provides a smooth, quiet, and efficient boating experience, perfect for those who need a dependable and easy-to-manage power source for their smaller vessels.

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Decoding the F4SMHA Model Code: Key Features at a Glance

The “SMHA” in the Yamaha F4SMHA model designation precisely defines its characteristics:

• S: Short Shaft (typically 15 inches). This length is ideal for smaller boats with low transoms, ensuring optimal propeller depth.
• M: Manual Start. This signifies that the engine is started using a pull cord.
• H: Tiller Handle. This indicates that the engine is controlled directly from the tiller handle (throttle and steering), rather than remote controls.
• A: (often refers to a specific generation or series within the F4 lineup, indicating updates or refinements).

Therefore, the F4SMHA is specifically engineered for boaters who prioritize strong portability, straightforward operation, and direct, hands-on control of their small craft, with the added benefit of flexible fueling options.

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Why the Yamaha F4SMHA Excels: Enhanced Power with Maximum Portability

For boaters who require a genuinely portable yet more powerful outboard than the F2.5, the Yamaha F4SMHA truly shines.

Impressive Power-to-Weight Ratio

Primarily, at 4 horsepower and weighing approximately 59-60 pounds (27 kg), the F4SMHA offers an excellent power-to-weight ratio for its class. This provides sufficient thrust for larger tenders, small aluminum boats, or even navigating moderate currents, while remaining highly manageable for transport and mounting.

Smart Storage System

Moreover, a standout feature shared with other Yamaha portables is its oil-leak prevention system for on-side storage. This clever design allows the engine to be laid down on its front, left, or right side without oil leakage, eliminating concerns about messy spills and making storage in tight spaces or vehicle trunks hassle-free. It also includes built-in carry handles and resting pads for added convenience.

Flexible Fueling Options

A key advantage of the F4SMHA is its dual fuel system. It comes with a convenient built-in 0.29-gallon (1.1-liter) see-through fuel tank, allowing you to easily monitor fuel levels. Crucially, it also features a switchable connection for an optional external fuel tank (e.g., 3.1-gallon). This provides excellent extended range for longer excursions without needing to refuel frequently.

Effortless Manual Starting

Despite being a manual start, the F4SMHA features an ergonomic, easy-grip starter handle with a built-in decompression device for incredibly easy pull starting. This system releases cylinder pressure during cranking, significantly reducing the effort required to get the engine running.

User-Friendly Tiller Control

The F4SMHA is equipped with a comfortable tiller handle that includes a twist-grip throttle for precise speed control. Its 360-degree steering capability provides exceptional maneuverability, allowing for full reverse thrust without the need to shift gears. It also features a Forward-Neutral-Reverse (F-N-R) gear shift, offering more precise control than basic F-N only models.

Clean and Efficient Four-Stroke Power

The F4SMHA features a 139cc single-cylinder, Overhead Valve (OHV) four-stroke engine. This design ensures exceptionally quiet, smooth, and fuel-efficient operation with ultra-low emissions. It boasts a 3-Star C.A.R.B. (California Air Resources Board) rating, making it environmentally friendly and compliant in all 50 states.

High-Output Alternator (Optional/Requires Kit)

The F4SMHA can also offer a 6-amp alternator output, which can power small electronics or charge a battery (requires an optional charging kit). This is a useful feature for extended use or if you have basic onboard electrical needs.

Legendary Yamaha Durability

Naturally, like all Yamaha outboards, the F4SMHA benefits from Yamaha’s commitment to durability. It features a robust design with superior corrosion protection (YDC-30 alloy, multi-layered paint finishes) to withstand harsh marine environments, ensuring years of reliable service.

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Core Features of Your Yamaha F4SMHA 4 HP Four-Stroke Outboard

4 Horsepower (Prop Shaft)

Delivering a robust 4 horsepower at the prop shaft, the F4SMHA provides ample thrust for propelling larger tenders, small aluminum boats, and other light craft with more authority than smaller portables.

Manual Start

The engine features a manual pull-start system with an automatic decompression device for easy and reliable starting every time.

Tiller Handle Control

Equipped with a tiller handle, it offers direct control over steering and throttle. It also features 360-degree steering for maximum maneuverability and a clear F-N-R (Forward-Neutral-Reverse) gear shift.

Short (15-inch) Shaft

The “S” in F4SMHA signifies a 15-inch (Short Shaft) length. This is the standard length for most small transoms found on tenders, inflatables, canoes, and small fishing boats.

Lightweight & Compact Design

Weighing approximately 59-60 lbs (27 kg), this is a remarkably lightweight 4 HP outboard. Its compact size, built-in carry handles, and resting pads make it incredibly easy to transport, mount, and store.

Oil Retention System for On-Side Storage

Yamaha’s innovative oil retention system prevents oil leakage, allowing the engine to be stored safely on its front, right, or left side without mess or damage to the cowling.

Integrated and External Fuel Tank Capability

Features a 0.29-gallon (1.1-liter) internal fuel tank and the option to switch to an external fuel tank (connection tap included) for extended range.

Smooth 139cc Single-Cylinder Engine

The 139cc, single-cylinder, OHV (Overhead Valve) engine delivers consistent, smooth, and quiet power for a pleasant boating experience.

Carbureted Fuel Induction

The carbureted fuel induction system provides simple and reliable fuel delivery for this class of outboard.

Alternator Output (6 Amps – Optional Kit)

Capable of producing 6 amps of power for charging or small electronics, although an optional charging kit may be required to utilize this feature.

Manual Trim & Tilt System

The F4SMHA features a manual tilt system with multiple trim positions, allowing the operator to manually adjust the engine’s angle for optimal performance and lift it for shallow water operation or trailering.

Legendary Yamaha Reliability and Corrosion Protection

Built with Yamaha’s renowned quality, the F4SMHA features a robust design and superior corrosion protection (YDC-30 alloy, 5-stage Phaze Five™ paint process) to ensure long-term durability in various marine environments.

CARB 3-Star Rating

The F4SMHA holds a 3-Star C.A.R.B. (California Air Resources Board) rating, indicating ultra-low emissions and compliance with stringent environmental standards.

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Perfect Applications for Your Yamaha F4SMHA 4 HP Outboard

The Yamaha F4SMHA is an excellent choice for a variety of small craft where portability, ease of use, and slightly more power than a 2.5 HP are essential:

• Small to Medium Aluminum Fishing Boats (e.g., Jon Boats, Small V-Hulls): Indeed, it provides reliable and efficient propulsion for fishing in lakes, rivers, and calm bays.
• Larger Inflatable Boats and Tenders: Furthermore, its light weight, F-N-R shifting, and flexible fueling make it a perfect auxiliary or primary motor for tenders, allowing for quick deployment and retrieval, even for longer distances.
• Canoes and Kayaks (with transom mounts): Moreover, for those who want substantial power for longer trips, against currents, or even for light loads, the F4SMHA offers a quiet and effective solution.
• Sailboat Auxiliaries / Kickers (for small to medium sailboats): The F4SMHA is a popular choice for sailboats needing a compact and reliable auxiliary motor, especially where a short shaft is appropriate.
• Small Utility Boats: Crucially, it’s excellent for various light-duty utility tasks on ponds, lakes, or protected waters.

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Yamaha Outboards 4HP | F4SMHA Unwavering Commitment to Quality and Performance

Choosing a Yamaha F4SMHA means more. You’re not just purchasing a small outboard motor. Instead, you’re investing in a meticulously engineered piece of marine equipment designed for robust portability, effortless operation, and long-term reliability. Yamaha’s decades of innovation and craftsmanship are evident in every aspect of the F4SMHA, from its smooth, quiet operation to its outstanding fuel economy and renowned durability. Ultimately, the F4SMHA embodies Yamaha’s promise to deliver a superior boating experience, ensuring peace of mind and countless hours of enjoyment on the water, even for your most compact adventures.

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Technical Specifications Yamaha Outboards 4HP | F4SMHA  (Approximate – Always Verify with Official Yamaha Resources for the specific model year)

• Model Name: F4SMHA
• Engine Type: 4-Stroke, OHV, 1-Cylinder
• Horsepower (Prop Shaft): 4 HP @ 4500 RPM
• Displacement: 139 cc (8.5 ci)
• Bore x Stroke: 62 x 46 mm (2.44 x 1.81 in.)
• Full Throttle RPM Range: 4000 – 5000 RPM (some sources say 4500-5500 RPM)
• Fuel Induction System: Carburetor
• Starting System: Manual
• Ignition System: CDI (Capacitor Discharge Ignition)
• Alternator Output: 6 Amps (requires optional charging kit for battery charging)
• Lubrication System: Wet Sump (pressurized oil delivery system)
• Engine Oil Capacity: 0.6 L (0.63 qt)
• Gear Ratio: 2.08:1
• Gear Shift: F-N-R (Forward, Neutral, Reverse)
• Shaft Length: 15 inches (Short Shaft)
• Trim & Tilt System: Manual Tilt (5 positions, 69° tilt)
• Recommended Fuel: Regular Unleaded (Minimum Pump Octane 87)
• Recommended Fuel Filtration: Yamaha Mini 10-Micron Fuel/Water Separating Filter (for external tank usage, good practice)
• C.A.R.B. Rating: 3-Star (Ultra Low Emission)
• Exhaust: Above Propeller
• Weight (Dry): Approximately 59-60 lbs (27 kg)
• Steering: Tiller Handle (180-degree steering angle)
• Standard Features: Integrated 1.1 L (0.29 gal) fuel tank, External fuel tank tap, Oil Retention System for On-Side Storage, Carry Handles, Resting Pads, Automatic Decompression for easy starting, Aluminum Propeller.
• Typical Color: Yamaha Gray

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Ready to power your small boat with a highly portable, versatile, and dependable 4 HP outboard? Invest in the Yamaha F4SMHA 4 HP Four-Stroke Outboard Motor today. Discover the freedom. Experience quiet, efficient power with flexible fueling options, all backed by Yamaha’s trusted quality. Ultimately, make your next outing on the water more capable and enjoyable.