Yamaha 25MLHD Owner's Manual

Pages 70

Year 2005

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Yamaha 25MLHD Specification

The Yamaha 25MLHD is a robust outboard motor designed for both reliability and performance, catering to the needs of various watercraft applications. This 25 horsepower engine is engineered with a two-stroke design, ensuring a lightweight yet powerful operation, ideal for small to medium-sized boats. It features manual start and tiller handle steering, which offers the operator direct and responsive control over the vessel. The long shaft length enhances versatility, making it suitable for deeper hull designs commonly found in fishing and leisure boats.

The outboard motor incorporates a loop charging system, optimizing fuel efficiency and delivering better combustion. With a displacement of 496cc, the 25MLHD provides sufficient power while maintaining a compact form factor. The incorporation of a CDI ignition system ensures reliable starts and smooth performance across various operating conditions. Additionally, the shallow water drive capability is a key feature, allowing navigation in less accessible areas without compromising propulsion efficiency.

Durability is a cornerstone of the Yamaha 25MLHD, built with a corrosion-resistant exterior and high-quality components to withstand harsh marine environments. It boasts a high-thrust propeller designed to maximize thrust and minimize cavitation, contributing to superior handling and speed control. Weighing in at approximately 52 kilograms, the engine strikes a balance between portability and performance. Offering a straightforward maintenance process, the Yamaha 25MLHD is designed for easy servicing, ensuring that it remains a dependable choice for boaters seeking reliable performance and longevity in their outboard motors.

Yamaha 25MLHD F.A.Q.

What is the recommended fuel type for the Yamaha 25MLHD outboard motor?

The recommended fuel type for the Yamaha 25MLHD is regular unleaded gasoline with a minimum octane rating of 87.

How do I perform routine maintenance on the Yamaha 25MLHD?

Routine maintenance includes checking and replacing the engine oil, inspecting the propeller, cleaning the fuel system, and checking the spark plugs. Follow the maintenance schedule in the owner's manual for detailed instructions.

What is the correct procedure for starting the Yamaha 25MLHD?

Ensure the gear shift is in neutral, squeeze the priming bulb until firm, pull the choke if necessary, and pull the starter rope firmly. Once the engine starts, gradually push the choke in.

How can I troubleshoot if the Yamaha 25MLHD won't start?

Check the fuel supply and lines, ensure the spark plug is clean and properly gapped, inspect the ignition system, and verify the engine is not flooded.

What are the steps to winterize the Yamaha 25MLHD?

To winterize, stabilize the fuel, fog the engine, change the oil, drain cooling water, and store in a dry, protected place. Consult the owner's manual for detailed guidance.

How often should I change the lower unit oil on the Yamaha 25MLHD?

The lower unit oil should be changed every 100 hours of operation or at least once per year.

What should I do if the Yamaha 25MLHD overheats?

Stop the engine immediately, check for blocked water intakes, ensure the water pump is functioning, and inspect cooling waterways for obstructions.

Can I use synthetic oil in my Yamaha 25MLHD?

Yes, synthetic oil can be used, but it should meet the specifications outlined in the owner's manual.

How do I adjust the idle speed on the Yamaha 25MLHD?

Idle speed can be adjusted by turning the idle speed screw on the carburetor. Refer to the service manual for the correct RPM settings and procedure.

What is the proper way to clean the Yamaha 25MLHD after use in saltwater?

Rinse the outboard with fresh water, flush the cooling system, and wash all external surfaces with mild soap and water to remove salt residues.