F15C F20B OWNER’S MANUAL Read this manual carefully before operating this outboard motor. 6AG-28199-23-E0...
EMU25052 Read this manual carefully before operating this outboard motor. Keep this manual onboard in a waterproof bag when boating. This manual should stay with the outboard motor if it is sold.
Any damage tain maximum enjoyment from your new resulting from neglect of these instructions is Yamaha. If you have any question about the not covered by warranty. operation or maintenance of your outboard Some countries have laws or regulations re- motor, please consult a Yamaha dealer.
Safety information EMU33622 tor and the clamp bracket when the motor is Outboard motor safety trimmed or tilted. Keep body parts out of this Observe these precautions at all times. area at all times. Be sure no one is in this EMU36501 area before operating the power tilt mecha- Propeller...
Personal flotation devices cording to the boat manufacturers instruc- Have an approved personal flotation device tions. Overloading or incorrect weight (PFD) on board for every occupant. Yamaha distribution can compromise the boats han-...
Safety information dling and lead to an accident, capsizing or boating in hazardous weather. swamping. EMU33880 Passenger training EMU33772 Avoid collisions Make sure at least one other passenger is Scan constantly for people, objects, and oth- trained to operate the boat in the event of an er boats.
Read any manuals supplied with the boat. Read all labels on the outboard motor and the boat. If you need any additional information, contact your Yamaha dealer. EMU33831 Warning labels If these labels are damaged or missing, contact your Yamaha dealer for replacements. F15C, F20B ZMU05739...
General information ZMU05670 EMU33912 Contents of labels EWM01671 The above warning labels mean as follows. WARNING Read Owner’s Manuals and labels. EWM01691 Wear an approved personal flotation WARNING device (PFD). Emergency starting does not have start- Attach engine shut-off cord (lanyard) to in-gear protection.
General information EMU33843 Electrical hazard Symbols The following symbols mean as follows. Notice/Warning ZMU05666 Remote control lever/gear shift lever operat- ing direction, dual direction ZMU05696 Read Owner’s Manual ZMU05667 Engine start/ Engine cranking ZMU05664 Hazard caused by continuous rotation ZMU05668 ZMU05665...
Specifications and requirements EMU34520 F20BEHP 570 mm (22.4 in) Specifications F20BEP 570 mm (22.4 in) TIP: F20BMH 565 mm (22.2 in) Weight (AL) S: “(AL)” stated in the specification data below F15CEH 53.7 kg (118 lb) represents the numerical value for the alumi- F15CMH 51.0 kg (112 lb) num propeller installed.
Specifications and requirements 0.8–0.9 mm (0.031–0.035 in) Control system: Fuel and oil: F15CEH Tiller Recommended fuel: F15CMH Tiller Regular unleaded gasoline F20BEHP Tiller Fuel tank capacity: F20BEP Remote control F15CEH 12 L F20BMH Tiller (3.17 US gal, 2.64 Imp.gal) Starting system: F15CMH 12 L F15CEH Electric (3.17 US gal, 2.64 Imp.gal)
WARNING multiple engine configurations or for an ac- If the engine starts in gear, the boat can cessory battery, consult your Yamaha dealer move suddenly and unexpectedly, pos- about battery selection and correct wiring. sibly causing a collision or throwing passengers overboard.
EMU37474 minimum octane rating. If knocking or ping- Engine oil requirements ing occurs, use a different brand of gasoline or premium unleaded fuel. Yamaha re- Recommended engine oil: comends that you use alcohol-free (see 4-stroke motor oil with a combination Gasohol) gasoline whenever possible.
A tool kit with assorted screwdrivers, pli- ers, wrenches (including metric sizes), and electrical tape. Waterproof flashlight with extra batteries. An extra engine shut-off cord (lanyard) with clip. Spare parts, such as an extra set of spark plugs. Consult your Yamaha dealer for details.
Components EMU2579M Components diagram TIP: * May not be exactly as shown; also may not be included as standard equipment on all mod- els. F15CMH, F20BMH ZMU05575 1. Top cowling 16. Tilt lock lever 2. Cowling lock lever 17. Clamp screw 3.
Components F15CEH, F20BEHP, F20BEP ZMU05629 1. Top cowling 21. Fuel tank 2. Cowling lock lever 22. Clip* 3. Drain screw EMU25802 4. Anti-cavitation plate Fuel tank 5. Trim tab If your model was equipped with a portable 6. Propeller fuel tank, its function is as follows. 7.
Components the tank can be filled with fuel. To remove the cap, turn it counterclockwise. EMU25860 Air vent screw This screw is on the fuel tank cap. To loosen the screw, turn it counterclockwise. EMU26181 Remote control box The remote control lever actuates both the shifter and the throttle.
Components when the remote control lever is in neutral. The remote control lever will operate only when the neutral throttle lever is in the closed position. 1. Neutral “ ” 2. Forward “ ” 3. Reverse “ ” 4. Shift 5.
Components ZMU05338 ZMU05519 1. Throttle indicator 1. Forward “ ” 2. Neutral “ ” EMU25975 3. Reverse “ ” Throttle friction adjuster A friction device provides adjustable resis- EMU25941 tance to movement of the throttle grip or the Throttle grip remote control lever, and can be set accord- The throttle grip is on the tiller handle.
Components ZMU05342 When constant speed is desired, tighten the 1. Cord adjuster to maintain the desired throttle set- 2. Clip 3. Engine shut-off switch ting. EMU25993 Engine shut-off cord (lanyard) and clip The clip must be attached to the engine shut- off switch for the engine to run.
Components EMU26090 Main switch The main switch controls the ignition system; its operation is described below. “ ” (off) With the main switch in the “ ” (off) posi- tion, the electrical circuits are off, and the key can be removed. “...
Components port side “A”. To decrease resistance, turn the lever to the starboard side “B”. EWM00040 WARNING Do not overtighten the friction adjuster. If there is too much resistance, it could be difficult to steer, which could result in an accident.
Components adjuster lever is set to the “A” position. placed to be sure steering is correct. Be Check the tiller handle for smooth move- sure you have tightened the bolt after ad- ment when the lever is turned to the star- justing the trim tab.
Components the release position. EMU26321 Tilt support knob To keep the outboard motor in the tilted up position, push the tilt support knob under the swivel bracket. ZMU05525 EMU30530 Tilt lock mechanism The tilt lock mechanism is used to prevent the outboard motor from lifting out of the wa- ter when in reverse gear.
Components ZMU05528 ECM01660 1. Power tilt unit NOTICE 2. Power tilt motor Do not use the tilt support bar when ECM00660 trailering the boat. The outboard motor NOTICE could shake loose from the tilt support Do not use the tilt support lever or knob and fall.
Components EMU26460 Flushing device This device is used to clean the cooling wa- ter passages of the motor using a garden hose and tap water. TIP: For details on usage, see page 60. ZMU05597 1. Flushing device EMU26303 Alert indicator If the engine develops a condition which is cause for alert, the indicator lights up.
Instruments and indicators EMU36014 Indicators EMU36024 Low oil pressure-alert indicator If oil pressure drops too low, this indicator will light up. For further information, see page 28. ECM00022 NOTICE Do not continue to run the engine if the low oil pressure-alert indicator is on ZMU06257 and the engine oil level is lower.
NOTICE Check the cooling water inlet for clogging. Do not continue to operate the engine if a alert device has activated. Consult your Yamaha dealer if the problem cannot be located and corrected. EMU2681A Overheat alert This engine has an overheat-alert device. If the engine temperature rises too high, the alert device will activate.
If the alert system has activated, stop the en- gine as soon as it is safe to do so. Check the oil level and add oil as needed. If the oil level is correct and the alert device does not switch off, consult your Yamaha dealer.
Installation EMU26902 Hold the handgrips and steering brack- Installation ets as shown in the illustration and lift up The information presented in this section is the outboard motor using two people. intended as reference only. It is not possible to provide complete instructions for every possible boat and motor combination.
25 mm (1 in) below it. 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...
This board (if packed). For details, consult could cause loss of control and seri- your Yamaha dealer. WARNING! Avoid ous injury. Make sure the transom using bolts, nuts or washers other screws are tightened securely. Occa-...
Operation EMU36381 For 10 hours for breaking in engine avoid ex- First-time operation tended idling, rough water and crowded ar- EMU36391 eas. Fill engine oil For the first hour of operation: The engine is shipped from the factory with- Run the engine at varying speeds up to out engine oil.
If any water is found in the fuel, or if a lift off the cowling. significant amount of debris is found, the fuel tank should be checked and cleaned by a Yamaha dealer. EMU36442 Fuel system ZMU06169 EWM00060...
Operation make sure there is no hesitation in their sition (not tilted). NOTICE: If the motor travel. Operation should be smooth over is not level, the oil level indicated on the complete range of motion, and each le- the dipstick may not be accurate. ver should return completely to the idle po- [ECM01790] sition.
After installing, check the fitting of the top gine can overheat during operation. cowling by pushing it with both hands. If the [ECM01800] top cowling is loose, have it repaired by your Yamaha dealer. ZMU06172 1. Fitting 2. Flushing device EMU34782...
Operation oil leaks. injury or death. Handle gasoline with care. Never siphon gasoline by mouth. If you should swallow some gasoline or inhale a lot of gasoline vapor, or get some gasoline in your eyes, see your doctor immediately. If gasoline spills on your skin, wash with soap and wa- ter.
Operation If you use a portable container to store EMU27451 Operating engine and dispense fuel, use only an approved EMU27466 GASOLINE container. Sending fuel (portable tank) Touch the fuel nozzle to the filler open- EWM00420 ing or funnel to help prevent electrostatic WARNING sparks.
Operation line to the joint on the fuel tank. ZMU05532 1. Arrow EMU27493 Starting engine EWM01600 WARNING 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 wa- ter near you.
Operation Starting procedure (cold engine) Place the gear shift lever in neutral. ZMU05600 Pull the manual starter handle slowly un- ZMU05533 til you feel resistance. Then give a strong pull straight out to crank and start TIP: the engine. Repeat if necessary. The start-in-gear protection device prevents the engine from starting except when in neu- tral.
Operation TIP: If the throttle is opened too much, the en- gine speed rises rapidly, causing the out- board motor to swivel toward the starboard side. Do not repeat opening and closing of the throttle grip as this cause the spark plug to wet with fuel and prevent from the engine to start.
Operation friction adjuster. If there is too much or leg. Then install the clip on the other resistance, it could be difficult to end of the cord into the engine shut-off move the throttle grip, which could switch. result in an accident. [EWM02250] EMU27604 Electric start/prime start models...
Operation lease the starter button and allow it to re- control. Also, without engine power, turn to its original position. NOTICE: the boat could slow rapidly. This could Never push the starter button while cause people and objects in the boat to the engine is running.
Immediately after the engine starts, re- case or the cooling water pilot hole is lease the main switch and allow it to re- blocked. Consult your Yamaha dealer if turn to “ ” (on). NOTICE: Never turn the problem cannot be located and cor- the main switch to “...
Pull the neutral interlock trigger up (if Check the oil level and add oil if nec- equipped). essary. Consult your Yamaha dealer if the cause for the low oil pressure- alert indicator cannot be found. [ECM01830]...
Operation START ZMU02297 After the engine is at idle speed in gear move the remote control lever / gear shift lever firmly and crisply into the neu- tral position. ZMU05729 TIP: Tiller handle models: The gear shift lever op- erates only when the throttle grip is in the ful- ly closed position.
Operation pact the steering wheel or other parts of the boat. This could increase the risk of serious injury. It could also damage the shift mechanism. Do not shift into reverse while traveling at planing speeds. Loss of control, boat swamping, or damage to the boat could occur.
Operation gine shut-off switch, then turning the main Stop the engine. switch to “ ” (off). Tilt the outboard motor up, and then re- EMU27862 move the trim rod from the clamp brack- Trimming outboard motor EWM00740 WARNING Excessive trim for the operating condi- tions (either trim up or trim down) can cause boat instability and can make steering the boat more difficult.
Operation EMU27904 Adjusting trim angle (power tilt models) EWM00753 WARNING Be sure all people are clear of the out- board motor when adjusting the trim angle. Body parts can be crushed be- tween the motor and the clamp bracket ZMU05579 when the motor is trimmed or tilted.
Operation from a standing start onto plane. TIP: Bow Up Depending on the type of boat, the outboard Too much trim-out puts the bow of the boat motor trim angle may have little effect on the too high in the water. Performance and econ- trim of the boat when operating.
Operation on page 47. Never tilt the outboard mo- tor while the engine is running. Severe damage from overheating can result. Do not tilt up the engine by pushing the tiller handle (if equipped) because this could break the handle. EMU32662 Procedure for tilting up (manual tilt models)
Operation ZMU05533 ZMU05580 ZMU04900 Press the power tilt switch “ ” (up) until Push the tilt support knob into the clamp the outboard motor has tilted up com- bracket support engine. pletely. WARNING! After tilting the outboard motor, be sure to support it with the tilt support knob or tilt support lever.
Operation ZMU05528 ZMU04884 Models equipped with trim rods: Once Slowly tilt the engine down. the outboard motor is supported with the EMU33120 Procedure for tilting down (power tilt tilt support lever, press the power tilt models) switch “ ” (down) to retract the trim Push the power tilt switch “...
Operation water cruising system is being used. Hitting an underwater obstacle could cause the outboard motor to lift out of the water, resulting in loss of control. Use extra care when operating in re- verse. Too much reverse thrust can cause the outboard motor to lift out of the water, increasing the chance of ac- cident and personal injury.
Operation Place the tilt lock lever in the release/up to allow operation in shallow water. position. ECM00260 NOTICE Do not tilt the outboard motor up so that the cooling water inlet on the lower unit is above the surface of the water when set- ting up for and cruising in shallow water.
[EWM01960] ter. Cruising in muddy, turbid, or acidic water Yamaha strongly recommends that you use the optional chromium-plated water pump kit (see page 13) if you use the outboard motor in acidic water or water with a lot of sediment in it, such as muddy or turbid (cloudy) water.
Place a towel or something similar under the outboard motor to protect it from damage. EMU28241 Storing outboard motor When storing your Yamaha outboard motor for prolonged periods of time (2 months or longer), several important procedures must be performed to prevent excessive damage.
Maintenance right), put it on a cushion after draining plate, or if the water supply is insuffi- the engine oil. cient, engine seizure may occur. Do not place the outboard motor on its [ECM00291] side before the cooling water has drained from it completely, otherwise water may enter the cylinder through the exhaust port and cause engine trou-...
72. Inspect the oil for the pres- ence of water that indicates a leaky seal. Seal replacement should be performed ZMU05556 by an authorized Yamaha dealer prior to use. 1. Fitting Grease all grease fittings. For further de- 2.
Outboard motors operating under any of these above conditions require more fre- quent maintenance. Yamaha recommends that you do this service twice as often as specified in the maintenance chart. For ex- ample, if a particular service should be done at 50 hours, do it instead at 25 hours.
Inspection or replace- switch/choke switch ment as necessary Wire harness connec- Inspection or replace- tions/wire coupler con- ment as necessary nections Inspection and clean- (Yamaha) Fuel tank ing as necessary EMU34451 Maintenance chart 2 Every Item Actions 1000 hours Exhaust guide/exhaust...
Maintenance F20BEP ZMU05595 EMU28956 Yamaha dealer. You should periodically re- Cleaning and adjusting spark plug move and inspect the spark plug because The spark plug is an important engine com- heat and deposits will cause the spark plug ponent and is easy to inspect. The condition to slowly break down and erode.
For cleaning or replacement of the Be sure to use the specified spark plug, fuel filter, consult your Yamaha dealer. otherwise the engine may not operate properly. Before fitting the spark plug, measure the electrode gap with a wire thickness gauge;...
For idle speed specifications, see page 9. If you have difficulty verify- ing the idle speed, or the idle speed re- quires adjustment, consult a Yamaha dealer or other qualified mechanic. EMU38802 Changing engine oil...
Change the oil more often when operating per and lower marks. Consult your the engine under adverse conditions such Yamaha dealer if the oil level is out of as extended trolling. specified level. EMU29113...
Maintenance damage. Check the propeller shaft for damage. Check the splines for wear or damage. Check for fish line tangled around the pro- peller shaft. ZMU02087 EMU32112 Checking propeller EWM01881 WARNING You could be seriously injured if the en- gine accidentally starts when you are Check the propeller shaft oil seal for dam- near the propeller.
If the propeller nut does not align with the tion and be lost. propeller shaft hole after tightening to the specified torque, tighten the nut further to Apply Yamaha marine grease or a cor- align it with the hole. rosion resistant grease to the propeller EMU29287 shaft.
If the oil is milky, water 9 Nm (0.9 kgf-m, 6.6 ft-lb) is getting into the gear case which can cause gear damage. Consult a EMU29302 Yamaha dealer for repair of the lower Cleaning fuel tank unit seals. [ECM00711] EWM00920...
EMU29312 Inspecting and replacing anode(s) leak, which could result in a fire or ex- Yamaha outboard motors are protected from plosion hazard. corrosion by sacrificial anodes. Inspect the Dispose of old gasoline according to lo- external anodes periodically.
Maintenance EMU29322 ing, consult your Yamaha dealer. Checking battery (for electric start Check the battery connections. They models) should be clean, secure, and covered by EWM01900 an insulating cover. WARNING! Bad WARNING connections can produce shorting or Battery electrolytic fluid is poisonous arcing and cause an explosion.
Maintenance cables must be clean and properly con- nected, or the battery will not start the engine. EMU29371 Disconnecting the battery Turn off the battery cut-off switch (if equipped) and main switch. NOTICE: If they are left on, the electrical system can be damaged.
Q. Has fuel pump malfunctioned? If your outboard motor requires repair, bring A. Have serviced by a Yamaha dealer. it to your Yamaha dealer. If the engine trouble-alert indicator is flash- Q. Are spark plug(s) fouled or of incorrect ing, consult your Yamaha dealer.
Q. Is fuel contaminated or stale? A. Fill tank with clean, fresh fuel. Q. Is carburetor clogged? A. Have serviced by a Yamaha dealer. Q. Is fuel filter clogged? A. Clean or replace filter. Q. Is fuel joint connection incorrect? A.
Q. Is fuel system obstructed? Q. Is water pump or thermostat faulty? A. Check for pinched or kinked fuel line or A. Have serviced by a Yamaha dealer. other obstructions in fuel system. Q. Is there excess water in fuel filter cup? Q.
Trouble Recovery ZMU05565 1. Manual valve screw 1. Fuse puller 2. Cap Put the engine in the desired position, 3. Fuse (20 A) then tighten the manual valve screw by 4. Spare fuse (20 A) turning it clockwise. EMU29533 Starter will not operate If the starter mechanism does not operate (the engine cannot be cranked with the start- er), the engine can be started with an emer-...
Trouble Recovery ing normal operation. Loss of engine 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. Make sure no one is standing behind you when pulling the starter rope.
Trouble Recovery TIP: 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.
Trouble Recovery ZMU05613 ZMU05615 Secure the electrical system plate by tightening the bolt(s), and fix the plate. ZMU05624 Remove the starter/flywheel cover after ZMU05616 removing the bolt(s). Prepare the engine for starting. For fur- ther information, see page 39. Be sure that the gear shift is in neutral and that the clip is attached to the engine shut-off switch.
Treatment of submerged motor If the outboard motor is submerged, immedi- ON START ately take it to a Yamaha dealer. Otherwise some corrosion may begin almost immedi- ately. NOTICE: Do not attempt to run the outboard motor until it has been com- pletely inspected.
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