Description
2020 Yamaha F4LMHA – Compact 4 HP Four-Stroke Outboard
The 2020 Yamaha F4LMHA is a lightweight, portable, and reliable four-stroke outboard engine, ideal for tenders, inflatables, jon boats, or as a kicker for larger vessels. It combines efficient performance with Yamaha’s renowned durability and user-friendly design.
Engine & Performance
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Engine Type: Single-cylinder, overhead valve (OHV) four-stroke
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Displacement: 139 cc
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Power Output: 4 HP at approximately 4,500 RPM
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Full-Throttle RPM Range: 4,000–5,000 RPM
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Compression Ratio: 8.9 : 1
Key Features & Handling
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Fuel System: Carbureted for simple, reliable operation
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Ignition System: Microcomputer-controlled CDI for consistent starting and smooth running
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Lubrication: Wet sump with a compact oil pump for reliable engine lubrication
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Fuel Tank: Built-in internal tank (~0.29 gallons) with option for an external tank for longer use
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Portability: Weighs approximately 61 lb (28 kg); equipped with handles and resting pads for easy transport
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Steering & Controls: Tiller-handled steering with 360° rotation and twist-grip throttle for smooth control
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Trim & Tilt: Manual trim with five positions and tilt capability up to ~69°
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Alternator Output: About 6 Amps at wide-open throttle, sufficient for basic electronics
Durability & Maintenance
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Corrosion Protection: Durable alloy construction with protective paint for harsh conditions
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Emissions Compliance: Meets U.S. emissions requirements
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Maintenance:
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Easy-access oil system for convenient maintenance
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Freshwater flush capability
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Leak-preventing oil retention system for long-term reliability
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Specifications Overview
| Specification | Details |
|---|---|
| Engine Type | 1-cylinder four-stroke (OHV) |
| Displacement | 139 cc |
| Horsepower | 4 HP at ~4,500 RPM |
| Full Throttle Range | 4,000–5,000 RPM |
| Weight | ~61 lb (28 kg) |
| Shaft Length Options | 15″ (short) and 20″ (long) |
| Fuel System | Carburetor |
| Ignition | CDI microcomputer |
| Alternator Output | ~6 A at wide-open throttle |
| Trim Positions | Manual, 5 settings |
| Tilt Range | Up to ~69° |
| Fuel Tank | Built-in (~0.29 gal) + external option |
| Emissions Rating | Meets all U.S. emissions |
| Warranty | Typically 3-year limited |
Best Applications & Advantages
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Ideal For: Inflatable boats, dinghies, small fishing craft, and tenders
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Portability: Lightweight and compact, easy to carry and store
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Reliable & Easy to Maintain: Clean-running four-stroke engine, simple systems, and oil retention
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User-Friendly Controls: Tiller steering with twist throttle
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Flexible Fuel Setup: Internal tank with external tank compatibility for extended range
Summary
The 2020 Yamaha F4LMHA is a compact, portable outboard motor offering practical performance and long-term reliability. Its lightweight design, easy handling, and durable four-stroke engine make it ideal for small boats, tenders, or as a dependable auxiliary motor.
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