![]() All of these problems will require professional knowledge, and you should not attempt to fix them on your own unless you are confident of your engine knowledge. Your outboard motor might also be overheating because of a faulty water pump, clogged thermostat or water line or a problem with the exhaust system. Replace any spark plugs with noticeable wear or cracks. Before attempting to change a spark plug, you must allow the engine to cool at that point you can remove the engine cover, take a spark plug wrench and 17 millimeter wrench from your tool kit and remove and inspect the spark plugs. An overheated engine can also be caused by a spark plug that has an improper heat range. This can be remedied simply by cleaning the water intake port, which is located slightly above the propeller. I recommendthatan individual looking for inexpensiveoutboard power,andwho has no realinterestinoutboards otherthan inpushing his boat,shouldbuy an OMC. One possible cause of an overheated engine is a clogged water intake port. Another symptom of an overheated engine is that engine speed will not increase when you open the throttle. Both brands are Perma Gap type plugs, with the Champion being the manufacturer supplied. If the overheat system activates and the light comes on or the buzzer sounds, your engine might lose speed if the boat is moving. The recommended spark plug for the 1977 model, 7.5 hp Mercury outboard is a Champion L78V, or NGK BUHW-2. ![]()
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