Yamaha F25ESH Owner's Manual

Pages 98

Year 2007

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of 98

Yamaha F25ESH Specification

The Yamaha F25ESH is a compact yet powerful outboard motor designed for versatility and efficiency. It features a 432cc, two-cylinder, four-stroke engine that delivers reliable performance while maintaining excellent fuel efficiency. The engine's design incorporates Yamaha's advanced engineering, ensuring smooth operation and reduced emissions, complying with stringent environmental standards.

The F25ESH is equipped with an electric start system, offering convenient and reliable engine ignition. It also includes a manual start as a backup, ensuring dependability in various conditions. The motor is engineered with a short shaft length, making it suitable for small boats and providing enhanced maneuverability in shallow waters.

A key component of the Yamaha F25ESH is its lightweight construction, which enhances portability and ease of installation without compromising on durability. The motor's tiller handle features ergonomic design considerations, offering a comfortable grip and intuitive control for the operator. This design enhances the overall user experience by providing precise steering and throttle control.

The outboard motor features a high-output alternator, ensuring sufficient electrical power for onboard electronics and battery charging. Additionally, the F25ESH includes Yamaha’s exclusive multi-function tiller handle, which integrates several controls into a single unit for ease of use, including throttle, gear shift, and engine stop.

Yamaha's reliability is further enhanced by their use of high-quality materials and robust construction, ensuring longevity and minimal maintenance requirements. The F25ESH is designed to deliver a quiet and smooth ride, thanks to its advanced noise reduction technologies. This outboard motor is an ideal choice for small boat owners seeking a balance of power, efficiency, and ease of use, with Yamaha's renowned reliability and performance.

Yamaha F25ESH F.A.Q.

What is the recommended maintenance schedule for the Yamaha F25ESH?

The Yamaha F25ESH should undergo regular maintenance every 100 hours of operation or annually, whichever comes first. This includes changing the engine oil, checking the spark plugs, and inspecting the fuel filter.

How can I troubleshoot a Yamaha F25ESH that won't start?

First, check the fuel supply to ensure there is enough fuel and that the fuel line is not clogged. Next, inspect the spark plug for wear or damage. Finally, ensure the battery is fully charged and the connections are secure.

What type of oil should be used in the Yamaha F25ESH?

Use Yamalube 4M 10W-30 for optimal performance. This oil is specifically formulated for Yamaha outboard motors and provides excellent protection and performance.

How do I properly winterize my Yamaha F25ESH outboard motor?

To winterize the F25ESH, first flush the engine with fresh water. Then, add a fuel stabilizer to the fuel tank. Finally, fog the engine cylinders with fogging oil to prevent corrosion.

What propeller size is recommended for the Yamaha F25ESH?

The recommended propeller size can vary depending on the boat type and usage, but generally, a 9 7/8 x 12 1/4 propeller is suitable for most applications.

How do I adjust the idle speed on my Yamaha F25ESH?

To adjust the idle speed, locate the idle adjustment screw on the carburetor. Turn the screw clockwise to increase the idle speed or counterclockwise to decrease it, ensuring the engine runs smoothly at idle.

What are the common reasons for overheating in a Yamaha F25ESH?

Common causes of overheating include a blocked water intake, an impeller in need of replacement, or insufficient coolant levels. Regularly check these components to prevent overheating.

How can I improve fuel efficiency on my Yamaha F25ESH?

To improve fuel efficiency, regularly service the engine, use the recommended propeller size, and avoid overloading the boat. Keeping the hull clean from marine growth also helps reduce drag and improve efficiency.

What should I do if the Yamaha F25ESH is emitting unusual noises?

Unusual noises may indicate a mechanical issue. Check for loose parts, ensure the propeller is not damaged, and inspect the engine mounts. If the noise persists, consult a professional technician.

How do I perform a compression test on my Yamaha F25ESH?

To perform a compression test, remove the spark plugs, attach a compression gauge to each cylinder, and crank the engine. Compare the readings to the manufacturer's specifications to assess engine health.