User manual YAMAHA F20

[. . . ] In this Owner's Manual particularly important information is distinguished in the following ways. The Safety Alert Symbol means ATTENTION!YOUR SAFETY IS INVOLVED! EWM00780 your machine and this manual. If there is any question concerning this manual, please consult your Yamaha dealer. NOTE: The F200TR, LF200TR, F225TR, LF225TR and the standard accessories are used as a base for the explanations and illustrations in this manual. [. . . ] Center line (keel line) ZMU01760 28 Operation NOTE: G 1. Center line (keel line) EMU26930 G The optimum mounting height of the outboard motor is affected by the boat/motor combination and the desired use. Test runs at different heights can help determine the optimum mounting height. Consult your Yamaha dealer or boat manufacturer for further information on determining the proper mounting height. For instructions on setting the trim angle of the outboard motor, see page 35. Mounting height (boat bottom) To run your boat at optimum efficiency, the water resistance (drag) of the boat and outboard motor must be made as little as possible. The mounting height of the outboard motor greatly affects the water resistance. If the mounting height is too high, cavitation tends to occur, thus reducing the propulsion; and if the propeller tips cut the air, the engine speed will rise abnormally and cause the engine to overheat. If the mounting height is too low, the water resistance will increase and thereby reduce engine efficiency. Mount the outboard motor so that the anti-cavitation plate is in alignment with the bottom of the boat. EMU30172 Breaking in engine Your new engine requires a period of break-in to allow mating surfaces of moving parts to wear in evenly. Correct break-in will help ensure proper performance and longer engine life. ECM00800 CAUTION: Failure to follow the break-in procedure could result in reduced engine life or even severe engine damage. EMU27080 Procedure for 4-stroke models Run the engine under load (in gear with a propeller installed) as follows. For the first hour of operation: Run the engine at 2000 r/min or at approximately half throttle. One of the most obvious changes has been the elimination of lead from most fuels. As gasoline has changed, the amount of additives such as aromatics and oxygenates has increased. These additives are important for the engines in passenger cars, but they can have detrimental effects in marine engines, because of increased deposits in the combustion chamber. When enough deposits collect, piston rings begin sticking. Performance drops and engine wear increases dramatically. While many additives available may reduce deposits, Yamaha recommends the use of Ring Free Fuel Additive, available from your Yamaha dealer. Ring Free Fuel Additive has repeatedly proven its ability to clean combustion deposits from inside the engine, notably the critical piston-ring-land area, and fuel system components. Follow product labeling for use instructions. EMU27450 G When the air vent screw is loosened, gasoline vapor will be released. Gasoline is highly flammable, and its vapors are flammable and explosive. Refrain from smoking, and keep away from open flames and sparks while loosening the air vent screw. This product emits exhaust gases which contain carbon monoxide, a colorless, odorless gas which could cause brain damage or death when inhaled. [. . . ] Have a Yamaha dealer inspect the outboard motor before operating it again. EMU29450 Running single engine When using only engine in an emergency, be sure to keep the unused one tilted up and operate the other engine at low speed. ECM00370 CAUTION: If the boat is operated with one engine in the water but not running, water may run into the exhaust pipe due to wave action, causing engine trouble. Temporary action in emergency EMU29440 Impact damage EWM00870 NOTE: When you are maneuvering at low speed, such as near a dock, it is recommended that both engines be running with one in neutral gear if possible. WARNING The outboard motor can be seriously damaged by a collision while operating or trailering. Damage could make the outboard motor unsafe to operate. 66 Trouble Recovery EMU29492 Replacing fuse If the fuse has blown on an electric start model, open the fuse box and use a fuse puller to replace the fuse with a spare one of the proper amperage. EWM00630 WARNING Be sure to use the specified fuse. An incorrect fuse or a piece of wire could allow excessive current flow. This could cause electric system damage and a fire hazard. ECM01382 1. [. . . ]