1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 12Get this manual

1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 12

COOLING SYSTEM: This outboard motor employs an open-circuit, direct-cooling systemAs preventive measure against over-cooling the engine, thermostat is used, which controls the engine operating temperature properlyCooling-water flow:

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