Yamaha 4CMH 4HP 2-Stroke Outboard Motor

Classic Simplicity: Yamaha 4CMH 4HP 2-Stroke Outboard Motor

Before the era of heavy 4-strokes, there was the Yamaha 4CMH — a no-nonsense, lightweight 2-stroke outboard that still sets the standard for portability and punch. Weighing significantly less than modern 4-stroke equivalents, this 4HP motor is the go-to choice for sailors, campers, and small boat owners who prioritize easy handling and proven reliability.

Key Features:

• Ultra-Lightweight Design: At just 17 kg (37 lbs) , the 2-stroke 4CMH is dramatically lighter than 4-stroke models. One person can easily carry, mount, and transport it without breaking their back.

• Simple 2-Stroke Power: No oil changes, no valves, no timing belts. Just mix oil with fuel (50:1 ratio), pull the cord, and go. Incredibly easy to maintain and repair.

• Built-In Fuel Tank: Features a convenient 1.5 L integral fuel tank — perfect for short trips, tendering, or as an auxiliary backup motor.

• Tool-Free Starting: Equipped with a reliable manual recoil starter and a simple choke system. Primitive? Yes. Reliable? Absolutely.

• 360° Steering with Tiller Handle: Full rotation for exceptional maneuverability when docking or navigating tight harbors. Twist-grip throttle offers responsive, direct control.

• Shallow Water Drive: Quickly tilt the motor to navigate shallow creeks, launch from beaches, or avoid submerged obstacles without damaging the propeller.

• Proven Yamaha Durability: Yamaha’s famous corrosion-resistant coatings and simple mechanical design mean this engine can sit for months and still start when you need it.

• Full Forward / Neutral / Reverse Gear Shift: True F/N/R gearbox gives you complete control, unlike cheaper direct-drive motors.

Technical Specifications:

• Engine Type: 1-cylinder, 2-stroke (loop charged)

• Displacement: 76 cc (4.64 cu in.)

• Bore x Stroke: 47 x 43 mm (1.85 x 1.69 in.)

• Propeller Shaft Horsepower: 4 HP @ 4500-5500 RPM

• Full Throttle RPM Range: 4500 – 5500

• Cooling System: Water-cooled (thermostat controlled)

• Starting System: Manual recoil

• Fuel Tank Capacity: 1.5 L (Internal)

• Fuel / Oil Mix Ratio: 50:1 (Yamalube 2M or TC-W3 certified oil)

• Recommended Fuel: Unleaded gasoline (Minimum 87 octane)

• Weight: 17 kg (37.5 lbs) — significantly lighter than 4-stroke versions

• Steering Angle: 360° (Tiller)

• Trim Positions: 4-step

• Gear Shift: Forward, Neutral, Reverse (F/N/R)

What’s in the Box:

• Yamaha 4CMH 2-Stroke Outboard Motor

• 2-blade or 3-blade aluminum propeller

• Owner’s manual & basic tool kit

• Fuel tank cap

• Fuel filter

Best Applications:

• Inflatable boats (2.3m – 3.0m / 7.5-10 ft)

• Dinghies and yacht tenders

• Small aluminum fishing boats

• Sailboats (as lightweight auxiliary power)

• Canoes and kayaks (with proper mounting)

• Camping and remote expeditions (easy to pack)

Important Notes:

• 2-stroke engines require pre-mixed fuel (50:1 ratio). Do not run on straight gasoline.

• Emissions: This is a traditional carbureted 2-stroke. Not legal for sale or use on some restricted lakes or in California (check local regulations).

• Smoke: Expect some exhaust smoke, especially at idle — normal for this engine type.

• Discontinued: This model has been largely replaced by 4-stroke versions in many markets. Available while stocks last.

Warranty: Limited 1-year warranty (if applicable — many sold as-is or with short-term coverage due to age/discontinuation).

Why choose the 2-stroke over the 4-stroke?
✅ 10 kg / 22 lbs lighter — your back will thank you
✅ Simpler maintenance — no oil changes
✅ More power-to-weight ratio
✅ Lower purchase price (typically