Yamaha F4AMH
Basic data
| Category: | outboard motor |
| Year of construction: | 2002 |
| Berth: |
Overijse, Belgium
|
Specifications
The Yamaha F4AMH is a compact outboard motor with a power output of 4 hp, designed for light vessels such as inflatable boats, tenders, 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 are 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 rpm range.
The engine uses a carburetor as its 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 engine is manually started via 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 circuit. This system ensures that the engine maintains a constant operating temperature, which benefits performance and longevity. Lubrication is via a wet sump, where the oil is stored in the engine and circulated. The oil capacity is 0.6 liters.
Drive and Control
The motor is equipped with a gearbox with three positions: forward, neutral, and reverse. The gear ratio is 2.08:1, meaning the propeller makes two revolutions for every revolution of the crankshaft. This contributes to efficient propulsion at low speeds. The gear shifts are manually operated via a lever on the side of the engine.
The trim and tilt function is also manual, meaning the engine can be manually set at different angles to adjust the sailing characteristics to the conditions. The steering angle is 180°, providing a wide turning circle and good maneuverability, especially at low speeds or in tight spaces.
Fuel System and Weight
The Yamaha F4AMH features a built-in fuel tank with a capacity of 1.1 liters. This makes the engine suitable for shorter trips without an external fuel tank. The total weight of the engine is approximately 23 kg, making it relatively light and portable. This makes the engine easy to mount and transport, for example, in the trunk of a car or on a boat trailer.
Propeller and Accessories
The engine 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 four-stroke outboard motor with a power output of 4 hp, suitable for smaller boats and tenders. The engine is manually started and operated and features a built-in fuel tank of 1.1 liters. Thanks to its compact size, low weight, and simple operation, this engine is suitable for various recreational applications on inland waters and sheltered coastal areas.
This engine comes with a standard propeller and is ready for use. The technical specifications provide a good understanding of the performance and application possibilities of this outboard motor.
ADDITIONAL INFORMATION
- We advise making use of the viewing day.
- This is a VAT product, and the bid price will be increased by 21% VAT.
- This product is sold under the general and special auction conditions.
- This concerns a public auction, which means that the purchase cannot be returned based on the legal right of withdrawal.
| Brand | Yamaha |
| Type | F4AMH |
| Year of construction | 2002 |
| Engine type | Outboard engine |
| Brand motor | Yamaha |
| Model engine | F4AMH |
| Power (hp) | 4 |
| Number of cylinders | 1 |
| Year of construction of the engine | 2002 |
| Fuel | Gasoline |
| Tank capacity in liters | 1.1 |
The Yamaha F4AMH is a compact outboard motor with a power output of 4 hp, designed for light vessels such as inflatable boats, tenders, 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 are 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 rpm range.
The engine uses a carburetor as its 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 engine is manually started via 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 circuit. This system ensures that the engine maintains a constant operating temperature, which benefits performance and longevity. Lubrication is via a wet sump, where the oil is stored in the engine and circulated. The oil capacity is 0.6 liters.
Drive and Control
The motor is equipped with a gearbox with three positions: forward, neutral, and reverse. The gear ratio is 2.08:1, meaning the propeller makes two revolutions for every revolution of the crankshaft. This contributes to efficient propulsion at low speeds. The gear shifts are manually operated via a lever on the side of the engine.
The trim and tilt function is also manual, meaning the engine can be manually set at different angles to adjust the sailing characteristics to the conditions. The steering angle is 180°, providing a wide turning circle and good maneuverability, especially at low speeds or in tight spaces.
Fuel System and Weight
The Yamaha F4AMH features a built-in fuel tank with a capacity of 1.1 liters. This makes the engine suitable for shorter trips without an external fuel tank. The total weight of the engine is approximately 23 kg, making it relatively light and portable. This makes the engine easy to mount and transport, for example, in the trunk of a car or on a boat trailer.
Propeller and Accessories
The engine 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 four-stroke outboard motor with a power output of 4 hp, suitable for smaller boats and tenders. The engine is manually started and operated and features a built-in fuel tank of 1.1 liters. Thanks to its compact size, low weight, and simple operation, this engine is suitable for various recreational applications on inland waters and sheltered coastal areas.
This engine comes with a standard propeller and is ready for use. The technical specifications provide a good understanding of the performance and application possibilities of this outboard motor.
VIEWING DAY INFORMATION
- The viewing day of this Yamaha F4AMH is on Saturday 17 May 2025 van 10:00 until 12:00 in Overijse (BE).
ADDITIONAL INFORMATION
- We advise making use of the viewing day.
- This is a VAT product, and the bid price will be increased by 21% VAT.
- This product is sold under the general and special auction conditions.
- This concerns a public auction, which means that the purchase cannot be returned based on the legal right of withdrawal.
| Brand | Yamaha |
| Type | F4AMH |
| Year of construction | 2002 |
| Engine type | Outboard engine |
| Brand motor | Yamaha |
| Model engine | F4AMH |
| Power (hp) | 4 |
| Number of cylinders | 1 |
| Year of construction of the engine | 2002 |
| Fuel | Gasoline |
| Tank capacity in liters | 1.1 |
