Yamaha F 15 Owners Manual
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25 Operation EMU26901 Installation CAUTION: ECM00110 Incorrect engine height or obstructions to smooth water flow (such as the design or condition of the boat, or accessories such as transom ladders or depth finder transducers) can create airborne water spray while the boat is cruising. Severe engine damage may result if the motor is operated continuously in the presence of airborne water spray. NOTE: During water testing check the buoyancy of the boat, at rest, with its maximum load. Check that the static water level on the ex- haust housing is low enough to prevent wa- ter entry into the powerhead, when water rises due to waves when the outboard is not running. EMU26910 Mounting the outboard motor WARNING EWM00820 Overpowering a boat could cause se- vere instability. Do not install an out- board motor with more horsepower than the maximum rating on the capac- ity plate of the boat. If the boat does not have a capacity plate, consult the boat manufacturer. The information presented in this sec- tion is intended as reference only. It is not possible to provide complete in- structions for every possible boat and motor combination. Proper mounting depends in part on experience and the specific boat and motor combination. WARNING EWM00830 Improper mounting of the outboard mo- tor could result in hazardous conditions such as poor handling, loss of control, or fire hazards. Observe the following: For permanently mounted models, your dealer or other person experienced in proper rigging should mount the motor. If you are mounting the motor yourself, you should be trained by an experi- enced person. For portable models, your dealer or oth- er person experienced in proper out- board motor mounting should show you how to mount your motor. Mount the outboard motor on the center line (keel line) of the boat, and ensure that the boat itself is well balanced. Otherwise the boat will be hard to steer. For boats without a keel or which are asymmetrical, consult your dealer. EMU26920 Mounting height To run your boat at optimum efficiency, the water resistance (drag) of the boat and out- board motor must be made as little as possi- ble. The mounting height of the outboard 1. Center line (keel line) ZMU017601
Operation 26 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 en- gine 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 between the bottom of the boat and a level 25 mm (1 in.) below it. NOTE: The optimum mounting height of the out- board motor is affected by the boat and motor combination and the desired use. Test runs at different heights can help de- termine the optimum mounting height. Consult your Yamaha dealer or boat man- ufacturer for further information on deter- mining the proper mounting height. For instructions on setting the trim angle of the outboard motor, see page 38. EMU26970 Clamping the outboard motor 1. Place the outboard motor on the tran- som so that it is positioned as close to the center as possible. Tighten the tran- som clamp screws evenly and securely. Occasionally check the clamp screws for tightness during operation of the out- board motor because they could be-come loose due to engine vibration. WARNING EWM00640 Loose clamp screws could allow the out- board motor to fall off or move on the transom. This could cause loss of control and serious injury. Make sure the tran- som screws are tightened securely. Oc- casionally check the screws for tightness during operation. 2. If the engine restraint cable attachment is equipped on your engine, an engine restraint cable or chain should be used. Attach one end to the engine restraint cable attachment and the other to a se- cure mounting point on the boat. Other- wise the engine could be completely lost if it accidentally falls off the transom. 3. Secure the clamp bracket to the transom using the bolts provided with the out- ZMU02011 0–25mm (0–1in.)ZMU02012 ZMU02013
Operation 27 board (if packed). For details, consult your Yamaha dealer. WARNING EWM00650 Avoid using bolts, nuts or washers other than those contained in the engine pack- aging. If used, they must be of at least the same quality of material and strength and must be tightened securely. After tighten- ing, test run the engine and check their tightness. 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 en- sure proper performance and longer engine life. CAUTION: ECM00800 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. 1. For the first hour of operation:Run the engine at 2000 r/min or at ap- proximately half throttle. 2. For the second hour of operation: Run the engine at 3000 r/min or at ap- proximately three-quarter throttle. 3. For the next eight hours of operation: Avoid continuous operation at full throt- tle for more than five minutes at a time. 4. After the first 10 hours: Operate the engine normally. EMU27101 Preoperation checks WARNING EWM00080 If any item in the preoperation check is not working properly, have it inspected and repaired before operating the out- board motor. Otherwise an accident could occur. CAUTION: ECM00120 Do not start the engine out of water. Over- heating and serious engine damage can occur. EMU27110 Fuel Check to be sure you have plenty of fuel for your trip. Make sure there are no fuel leaks or gaso- line fumes. Check fuel line connections to be sure they are tight (if equipped Yamaha fuel tank or boat tank). Be sure the fuel tank is positioned on a se- cure, flat surface, and that the fuel line is not twisted or flattened, or likely to contact sharp objects (if equipped Yamaha fuel tank or boat tank). EMU27130 Controls Check throttle, shift, and steering for prop- 1. Bolts ZMU02631 1
Operation 28 er operation before starting the engine. The controls should work smoothly, with- out binding or unusual free play. Look for loose or damaged connections. Check operation of the starter and stop switches when the outboard motor is in the water. EMU27140 Engine Check the engine and engine mounting. Look for loose or damaged fasteners. Check the propeller for damage. EMU27163 Checking the engine oil level 1. Put the outboard motor in an upright po- sition (not tilted). 2. Remove oil dipstick and wipe it clean. 3. Completely insert the dipstick and re- move it again. 4. Check the oil level using the dipstick to be sure the level falls between the upper and lower marks. Fill with oil if it is below the lower mark, or drain to the specified level if it is above the upper mark. NOTE: Be sure to completely insert the dipstick into the dipstick guide. EMU30021 Filling fuel WARNING EWM00060 Gasoline and its vapors are highly flam- mable and explosive. Keep away from sparks, cigarettes, flames, or other sources of ignition. 1. Remove the fuel tank cap. 2. Carefully fill the fuel tank. 3. Securely close the cap after filling the tank. Wipe up any spilled fuel. EMU27270 Ring Free Fuel Additive Gasoline is a precise blend of many different substances, each chosen to give certain characteristics. Gasoline blends have been changing in recent years in response to con- cerns about pollution and resulting emis- sions regulations. One of the most obvious changes has been the elimination of lead from most fuels. As gasoline has changed, the amount of ad- ditives such as aromatics and oxygenates has increased. These additives are impor- tant 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 de- posits collect, piston rings begin sticking. Performance drops and engine wear in- creases 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 Addi- tive 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 la- beling for use instructions. 1. Lower level mark 2. Oil dipstick 3. Upper level mark ZMU02082 1 3 2
Operation 29 EMU27450 Operating engine EMU27461 Feeding fuel (portable tank) WARNING EWM00420 Before starting the engine, make sure that the boat is tightly moored and that you can steer clear of any obstructions. Be sure there are no swimmers in the water near you. When the air vent screw is loosened, gasoline vapor will be released. Gaso- line is highly flammable, and its vapors are flammable and explosive. Refrain from smoking, and keep away from open flames and sparks while loosen- ing the air vent screw. This product emits exhaust gases which contain carbon monoxide, a col- orless, odorless gas which could cause brain damage or death when inhaled. Symptoms include nausea, dizziness, and drowsiness. Keep cockpit and cab- in areas well ventilated. Avoid blocking exhaust outlets. 1. If there is an air vent screw on the fuel tank cap, loosen it 2 or 3 turns. 2. If there is a fuel joint on the motor, firmly connect the fuel line to the joint. Then firmly connect the other end of the fuelline to the joint on the fuel tank. 3. If a steering friction adjuster is provided on your outboard motor, securely attach the fuel line to the fuel line clamp. NOTE: During engine operation place the tank hori- zontally, otherwise fuel cannot be drawn from the fuel tank. 4. Squeeze the primer pump with the outlet end up until you feel it become firm. ZMU02022 ZMU02024 ZMU02023 ZMU02025
Operation 30 EMU27490 Starting engine EMU27505 Manual start models (tiller control) 1. Place the gear shift lever in neutral. NOTE: The start-in-gear protection device prevents the engine from starting except when in neu- tral. 2. Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg. Then install the lock plate on the other end of the lanyard into the en- gine stop switch. WARNING EWM00120 Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg while operating. Do not attach the lanyard to clothing that could tear loose. Do not route thelanyard where it could become entan- gled, preventing it from functioning. Avoid accidentally pulling the lanyard during normal operation. Loss of en- gine power means the loss of most steering control. Also, without engine power, the boat could slow rapidly. This could cause people and objects in the boat to be thrown forward. 3. Place the throttle grip in the “” (start) position. 4. Pull out / turn the choke knob fully. After the engine starts, replace / return the knob to the home position. ZMU01988 N N ZMU04881 ZMU02026 ZMU02027
Operation 31 NOTE: It is not necessary to use the choke when starting a warm engine. If the choke knob is left in the “” (start) position while the engine is running, the engine will run poorly or stall. 5. Pull the manual starter handle slowly un- til you feel resistance. Then give a strong pull straight out to crank and start the engine. Repeat if necessary. 6. After the engine starts, slowly return the manual starter handle to its original po- sition before releasing it. 7. Slowly return the throttle grip to the fully closed position. NOTE: When the engine is cold, it needs to be warmed up. For further information, see page 35. If the engine does not start on the first try, repeat the procedure. If the engine fails to start after 4 or 5 tries, open the throttle a small amount (between 1/8 and 1/4) and try again. Also if the engine is warm and fails to start, open the throttle a same amount and try to start the engine again. If the engine still fails to start, see page 74. EMU27562 Electric start models 1. Place the gear shift lever in neutral. ZMU02355 ZMU02029 ZMU02030 ZMU01988 N
Operation 32 NOTE: The start-in-gear protection device prevents the engine from starting except when in neu- tral. 2. Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg. Then install the lock plate on the other end of the lanyard into the en- gine stop switch. WARNING EWM00120 Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg while operating. Do not attach the lanyard to clothing that could tear loose. Do not route the lanyard where it could become entan- gled, preventing it from functioning. Avoid accidentally pulling the lanyard during normal operation. Loss of en- gine power means the loss of most steering control. Also, without engine power, the boat could slow rapidly. This could cause people and objects in the boat to be thrown forward. 3. Place the throttle grip in the “” (start) position. After the engine starts, return the throttle to the fully closed po- sition. 4. Pull out / turn the choke knob fully. After the engine starts, replace / return the knob to the home position. NOTE: It is not necessary to use the choke when starting a warm engine. N ZMU04881ZMU02026 ZMU02027 ZMU02355
Operation 33 If the choke knob is left in the “” (start) position while the engine is running, the engine will run poorly or stall. 5. Push the starter button to start the mo- tor. (Repeat if necessary.) 6. Immediately after the engine starts, re- lease the starter button to allow it to re- turn to its original position. 7. Slowly return the throttle grip to the fully closed position so that the engine does not stall. CAUTION: ECM00160 Never push the starter button while the engine is running. Do not keep the starter motor turning for more than 5 seconds. If the starter motor is turned continuously for more than 5 seconds, the battery will be quickly discharged, thus making it im- possible to start the engine. The starter can also be damaged. If the engine will not start after 5 seconds of cranking, release the starter button, wait 10 sec- onds, then crank the engine again. NOTE: When the engine is cold, it needs to be warmed up. For further information, see page 35. If the engine does not start on the first try,repeat the procedure. If the engine fails to start after 4 or 5 tries, open the throttle a small amount (between 1/8 and 1/4) and try again. Also if the engine is warm and fails to start, open the throttle a same amount and try to start the engine again. If the engine still fails to start, see page 74. EMU27642 Electric start / remote control models 1. Place the remote control lever in neutral. NOTE: The start-in-gear protection device prevents the engine from starting except when in neu- tral. 2. Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg. Then install the lock plate on the other end of the lanyard into the en- gine stop switch. WARNING EWM00120 Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg while operating. Do not attach the lanyard to clothing that could tear loose. Do not route the lanyard where it could become entan- gled, preventing it from functioning. Avoid accidentally pulling the lanyard during normal operation. Loss of en- ZMU04880
Operation 34 gine power means the loss of most steering control. Also, without engine power, the boat could slow rapidly. This could cause people and objects in the boat to be thrown forward. 3. Turn the main switch to “” (on). 4. Open the throttle slightly without shifting using the neutral throttle lever or free ac- celerator. You may need to change the throttle opening slightly depending on engine temperature. After the engine starts, return the throttle to the original position. NOTE: On remote controls equipped with a neu- tral throttle lever, a good starting point is to lift the lever just until you feel resistance, then lift slightly more. The neutral throttle lever or free accelera- tor can only be used when the remote con- trol lever is in neutral. 5. Press in and hold the main switch to op- erate the remote choke system. The re- mote choke switch automatically returns to its normal position when you release your hand. Therefore keep the switch pressed in. NOTE: It is not necessary to use the choke when starting a warm engine. Push in the main switch fully, or the remote choke system will not operate. OFF ON ZMU01880 N ZMU02314 START OFFON ZMU02315