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Yamaha F4Amh

Compact 4hp Outboard Motor For Small Boats.

Build year:  2002

Belgium

Sailingboat for sale

25 EUR



ex. EU Vat.
  • Boatauction.com
  • Rubberstraat 9
  • 1411 AL Naarden
  • The Netherlands
  • +31 35-5449675
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Description

The Yamaha F4AMH is a compact outboard motor with a power of 4 hp, designed for light vessels such as inflatable boats, dinghies, or small fishing boats. This four-stroke engine is from the 2003 model year and was produced in 2002. The motor features a short shaft (S) version, making it suitable for boats with a transom height of approximately 15 inches (381 mm). Technical Specifications The Yamaha F4AMH is equipped with a 1-cylinder four-stroke engine with a displacement of 139 cm³. The bore and stroke measure 62 mm and 46 mm respectively, resulting in a compression ratio of 8.9:1. The maximum power of 4 hp (2.9 kW) is delivered at 4,500 revolutions per minute. The full throttle range is between 4,000 and 5,000 rpm, ensuring smooth power delivery within this speed range. The engine utilizes a carburetor as the fuel system and features a CDI (Capacitor Discharge Ignition) ignition system. This type of ignition is known for its simple construction and direct spark delivery. The motor is manually started using a pull cord, which is common for engines in this power class. Cooling and Lubrication The Yamaha F4AMH is water-cooled and has a thermostatically controlled cooling system. This system maintains the engine at a constant operating temperature, benefiting performance and longevity. Lubrication is done through a wet sump, where oil is stored and circulated within the engine. The oil capacity is 0.6 liters. Propulsion and Operation The motor is equipped with a three-speed gearbox: forward, neutral, and reverse. The gear ratio is 2.08:1, meaning the propeller makes two rotations for every crankshaft rotation. This contributes to efficient propulsion at low speeds. Gear shifting is manually done via a lever on the side of the motor. The trim and tilt function is also manual, allowing the motor to be adjusted to different angles to adapt the handling to various conditions. The steering angle is 180°, providing a wide turning radius and good maneuverability, especially at low speeds or in tight spaces. Fuel System and Weight The Yamaha F4AMH has a built-in fuel tank with a capacity of 1.1 liters. This makes the motor suitable for shorter trips without an external fuel tank. The total weight of the motor is approximately 23 kg, making it relatively light and portable. This makes the motor easy to mount and transport, for example in the trunk of a car or on a boat trailer. Propeller and Accessories The motor comes standard with a 3-blade aluminum propeller. This propeller is designed for a good balance between thrust and efficiency. Aluminum is a commonly used material for propellers due to its combination of strength and relatively low weight. The Yamaha F4AMH is a 4 hp four-stroke outboard motor, suitable for smaller boats and dinghies. The motor is manually started and operated, and features a built-in 1.1-liter fuel tank. With its compact size, low weight, and easy operation, this motor is suitable for various recreational uses on inland waters and sheltered coastal areas. This motor comes with a standard propeller and is ready for use. The technical specifications provide a comprehensive overview of the performance and applications of this outboard motor.

Specifications

Materiale / unit

Hull type

Fibreglass

Motor & technic

Engine

Fuel

Unknown