Maintenance

ECM01411

NOTICE

●Do not place the outboard motor on its side before the cooling water has drained from it completely, otherwise water may enter the cylinder through the exhaust port and cause engine trouble.

●Store the outboard motor in a dry, well- ventilated place, not in direct sunlight.

EMU28304

Procedure

EMU28376

Flushing in a test tank

ECM00300

NOTICE

Do not run the engine without supplying it with cooling water. Either the engine water pump will be damaged or the engine will be damaged from overheating. Before starting the engine, be sure to supply water to the cooling water passages.

1.Wash the outboard motor body using fresh water. NOTICE: Do not spray wa- ter into the air intake. [ECM01840] For further information, see page 43.

2.Fill the fuel tank with fresh fuel and add one ounce of “Yamaha Fuel Conditioner and Stabilizer” to each gallon of fuel.

TIP:

The use of “Yamaha Fuel Conditioner and Stabilizer” eliminates the need to drain the fuel system. Consult your Yamaha dealer or other qualified mechanic if the fuel system is to be drained instead.

3.Remove the engine top cowling and si- lencer cover.

4.Install the outboard motor on the test tank.

1

2

ZMU02051

1.Water surface

2.Lowest water level

5.Fill the tank with fresh water to above the level of the anti-cavitation plate. NOTICE:

If the fresh water level is below the lev- el of the anti-cavitation plate, or if the water supply is insufficient, engine seizure may occur. [ECM00291]

6.Cooling system flushing is essential to prevent the cooling system from clogging up with salt, sand, or dirt. In addition, fog- ging of the engine is mandatory to pre- vent excessive engine damage due to rust. Perform the flushing and fogging at the same time. WARNING! Do not touch or remove electrical parts when starting or during operation. Keep hands, hair, and clothes away from the flywheel and other rotating parts while the engine is running. [EWM00091]

7.Run the engine at a fast idle for 10–15 minutes in neutral position.

8.Just prior to turning off the engine, quickly spray “Yamaha Stor-Rite Engine Fogging Oil” alternately into each carburetor or the fogging hole of the silencer cover, if equipped. When properly done, the en- gine will smoke excessively and almost stall.

9.Remove the outboard motor from the test tank.

42