Yamaha 8CMHS v2 Owner's Manual

Pages 98

Year 2003

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of 98

Yamaha 8CMHS Specification

The Yamaha 8CMHS is a portable outboard motor designed for small watercraft, offering a blend of performance, reliability, and efficiency. It features a two-cylinder, two-stroke engine with a displacement of 165 cc, delivering a maximum output of 5.9 kW (8 hp) at 5,000 rpm. This motor is engineered for smooth operation, incorporating Yamaha's CDI ignition system for reliable starting and performance. The 8CMHS includes a manual pull start mechanism, ensuring ease of use and maintenance.

The motor's compact design facilitates portability and installation, making it ideal for small boats and inflatables. It weighs approximately 27 kg, allowing for easy handling. The tiller handle provides intuitive control, with a forward-neutral-reverse gear shift for seamless maneuverability. The motor is equipped with a 180-degree steering angle, enhancing navigation capabilities in confined spaces.

Fuel efficiency is a highlight, with the motor utilizing a pre-mixed fuel system that combines gasoline and oil at a 100:1 ratio. The integrated fuel tank has a capacity of 12 liters, ensuring extended operation without frequent refueling. Additionally, the 8CMHS features a shallow water drive system, allowing for operation in low-depth areas without risking damage to the propeller.

Durability is assured with anti-corrosion protection through Yamaha's proprietary YDC-30 aluminum alloy and a freshwater flushing device that simplifies maintenance. The 8CMHS complies with stringent environmental regulations, producing minimal emissions while retaining robust performance. Overall, the Yamaha 8CMHS stands out as a reliable, efficient, and user-friendly option for those seeking an outboard motor for light-duty marine applications.

Yamaha 8CMHS F.A.Q.

How do I start the Yamaha 8CMHS outboard motor?

To start the Yamaha 8CMHS, ensure the fuel tank is full and the fuel line is connected. Set the choke to the "on" position if the engine is cold. Pull the starter handle slowly until you feel resistance, then pull sharply to start the engine.

What is the recommended maintenance schedule for the Yamaha 8CMHS?

The Yamaha 8CMHS should have routine maintenance every 100 hours or annually, whichever comes first. This includes checking the spark plug, changing the engine oil, inspecting the fuel system, and ensuring all bolts and nuts are secure.

How can I troubleshoot if the Yamaha 8CMHS is not starting?

First, check the fuel level and ensure the fuel line is not kinked. Verify the choke is set correctly and inspect the spark plug for fouling. If the engine still won't start, consult the manual for further diagnostics or contact a professional technician.

What type of oil should be used in the Yamaha 8CMHS?

Use Yamaha 2-stroke engine oil or a high-quality 2-stroke oil that meets the TC-W3 standard. Always mix the oil with fuel at the recommended ratio, typically 50:1, to ensure proper lubrication.

How do I properly store the Yamaha 8CMHS during the off-season?

To store the Yamaha 8CMHS, drain the fuel from the tank and carburetor. Remove the spark plug and add a small amount of oil into the cylinder, then pull the starter handle to distribute the oil. Store the motor in a dry, cool place away from direct sunlight.

What should I do if the Yamaha 8CMHS overheats?

If the Yamaha 8CMHS overheats, stop the engine immediately. Check the water intake for blockages and ensure the cooling water is flowing properly. Allow the engine to cool before restarting, and consult a technician if the problem persists.

How can I improve the fuel efficiency of my Yamaha 8CMHS?

To improve fuel efficiency, ensure the propeller is the correct size and pitch. Regularly clean the hull of your boat to reduce drag, and avoid carrying excessive weight. Additionally, maintain a steady throttle speed during operation.

What are the signs of a fouled spark plug in the Yamaha 8CMHS?

Signs of a fouled spark plug include difficulty starting the engine, a rough idle, and poor acceleration. Inspect the spark plug for carbon deposits and replace it if necessary to ensure optimal performance.

How do I change the propeller on the Yamaha 8CMHS?

To change the propeller, remove the cotter pin and unscrew the propeller nut. Slide off the old propeller and replace it with a new one, ensuring it is properly aligned. Reattach the propeller nut and secure it with a new cotter pin.

What steps should I take if the Yamaha 8CMHS loses power while running?

If the Yamaha 8CMHS loses power, check for fuel blockages and inspect the air filter for cleanliness. Ensure the spark plug is in good condition and that the carburetor is functioning correctly. If the issue persists, seek assistance from a qualified mechanic.