Yamaha F4MLHC Owner's Manual

Pages 104

Year 2004

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of 104

Yamaha F4MLHC Specification

The Yamaha F4MLHC is a compact and reliable 4-stroke outboard motor designed to deliver exceptional performance for small watercraft. With a displacement of 139cc, this engine provides efficient power output while maintaining fuel economy, making it an ideal choice for recreational boating enthusiasts. The F4MLHC features a single-cylinder, SOHC design that ensures smooth and quiet operation, enhancing the overall boating experience.

The motor is equipped with a manual start system, offering simplicity and reliability in various conditions. Its integral fuel tank, with a capacity of 1.1 liters, provides sufficient fuel for extended trips, and it also includes an external fuel connector for additional capacity if needed. The F4MLHC is designed for convenience, featuring a 360-degree steering capability that allows for excellent maneuverability, which is particularly useful in tight or restricted spaces.

For durability, the engine incorporates a tough, marine-grade aluminum alloy construction that resists corrosion in saltwater environments. Additionally, it features a shallow water drive system to facilitate easy navigation in shallow areas, preventing propeller and engine damage. The F4MLHC is engineered to meet stringent emissions regulations, making it an environmentally friendly choice without sacrificing performance.

Its lightweight design, weighing in at just 27 kg, ensures easy transport and installation, while the ergonomic carrying handle enhances portability. The engine is compatible with a wide range of small boats and dinghies, offering versatility and adaptability for various marine activities. Overall, the Yamaha F4MLHC combines reliability, efficiency, and ease of use, making it a preferred option for those seeking a dependable outboard motor for leisurely water adventures.

Yamaha F4MLHC F.A.Q.

How do I perform regular maintenance on my Yamaha F4MLHC outboard motor?

To maintain your Yamaha F4MLHC, regularly check the oil level and change it every 100 hours or annually. Inspect the fuel system for leaks, clean the fuel tank, and replace the fuel filter as needed. Check the spark plugs, cooling system, propeller, and grease all necessary fittings.

What is the correct way to start the Yamaha F4MLHC engine?

Ensure the engine is in neutral, attach the safety lanyard, open the fuel valve, and pull the choke if needed. Pull the starter cord firmly until the engine starts. Once started, gradually push the choke back in.

How can I troubleshoot if the Yamaha F4MLHC won't start?

Check the fuel supply to ensure the tank is full and the fuel valve is open. Inspect the spark plugs for fouling and replace if necessary. Ensure the safety lanyard is properly attached, and verify that the engine is in neutral.

What should I do if the Yamaha F4MLHC outboard motor overheats?

Stop the engine immediately. Check for obstructions in the water intake and clear any debris. Inspect the water pump impeller and replace it if damaged. Ensure the cooling system is working properly by checking water flow from the tell-tale.

How do I clean the carburetor on my Yamaha F4MLHC?

Remove the carburetor from the engine, disassemble it carefully, and clean all parts with a carburetor cleaner. Pay special attention to jets and passages. Reassemble the carburetor and reinstall it on the engine, ensuring all connections are secure.

What type of oil should be used in the Yamaha F4MLHC?

Use a high-quality marine 4-stroke oil that meets or exceeds the NMMA FC-W certification. Yamaha recommends their own Yamalube 4M oil for optimal performance and protection.

How often should I replace the water pump impeller in my Yamaha F4MLHC?

It is recommended to replace the water pump impeller every 200 hours of operation or every two years, whichever comes first, to ensure proper cooling system function.

Can I use ethanol-blended fuels with the Yamaha F4MLHC?

Yamaha outboards can use ethanol-blended fuels up to 10% ethanol (E10). Avoid higher ethanol content fuels, as they can cause damage to the fuel system and engine components.

How do I winterize my Yamaha F4MLHC outboard motor?

To winterize your Yamaha F4MLHC, drain the fuel system or add a fuel stabilizer, change the engine oil, flush the cooling system with fresh water, and apply fogging oil to the cylinders. Store the motor in an upright position in a dry, cool place.

What are the signs that my Yamaha F4MLHC's propeller needs replacement?

Signs that the propeller needs replacement include vibrations, poor acceleration, reduced top speed, and visible damage such as cracks, bends, or excessive wear on the blades.