Page 2
EMU25072 ZMU01690 Read this owner’s manual carefully before operating or working on your outboard motor. Keep this manual onboard in a waterproof bag when boating. This manual should stay with the outboard motor if it is sold.
EMU25111 Yamaha. If you have any question about the operation or maintenance of your outboard motor, please consult a Yamaha dealer. In this Owner’s Manual particularly important...
Table of contents General information ......1 Installation requirements....14 Boat horsepower rating ....14 Identification numbers record..1 Mounting motor ....... 14 Outboard motor serial number ..1 Remote control requirements ..14 Key number........1 Battery requirement......14 Emission control information ...
Page 5
Table of contents Low battery voltage-warning Procedure........52 indicator ........29 Trimming outboard motor....53 Fuel management meter ....29 Adjusting trim angle (Power trim Fuel flow meter........ 29 and tilt) .......... 53 Fuel consumption meter ....30 Adjusting boat trim ......54 Fuel economy .........
Page 6
Procedure ........86 Consumer information....88 Important warranty information for U.S.A. and Canada ..... 88 YAMAHA MOTOR CORPORATION, U.S.A. OUTBOARD MOTOR TWO YEAR LIMITED WARRANTY ..90 IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR YAMAHA OUTSIDE THE USA OR CANADA ...... 93...
Record your outboard motor serial number in the spaces provided to assist you in ordering spare parts from your Yamaha dealer or for reference in case your outboard motor is sto- len. 1. Key number...
General information particular label. ZMU05945 ZMU04932 EMU25262 Manufactured date label 1. Star labels location This label is attached to the clamp bracket or the swivel bracket. EMU25280 One Star—Low Emission The one-star label identifies engines that meet the Air Resources Board’s 2001 ex- haust emission standards.
General information ZMU01703 ZMU05663 EMU25300 EMU25382 Important labels Three Stars—Ultra Low Emission The three-star label identifies engines that EMU25395 meet the Air Resources Board’s 2008 ex- Warning labels haust emission standards. Engines meeting these standards have 65% lower emissions than One Star-Low-Emission engines. ZMU01858 ZMU01704 EMU33861...
General information when starting or during operation. EMU30690 Label Keep hands, hair, and clothes away ECM01480 from flywheel and other rotating parts CAUTION: while engine is running. USE UNLEADED STRAIGHT GASOLINE EMU25413 ONLY Label (counter rotation models) Gasoline containing lead can cause EWM01281 performance loss and engine damage.
Safety information EMU33621 Severe injury could occur if the outboard mo- Safety information tor accidentally falls. Observe these precautions at all times. EMU33670 Engine shut-off cord EMU33630 Rotating parts Attach the engine shut-off cord so that the Hands, feet, hair, jewelry, clothing, PFD engine stops if the operator falls overboard straps, etc.
Have an approved personal flotation device tions. Overloading or incorrect weight (PFD) on board for every occupant. Yamaha distribution can compromise the boats han- recommends that you must wear a PFD dling and lead to an accident, capsizing or whenever boating.
Safety information Avoid sharp turns or other maneuvers that You may also want to consider an Internet- make it hard for others to avoid you or un- based program for basic boater education. derstand where you are going. The Online Boating Safety Course provided Avoid areas with submerged objects or by the BoatU.S.
Safety information trators, or your local Power Squadron for a Marine Retailers Association of America complete set of rules governing the waters in 155 N. Michigan Ave. Chicago, which you will be using your boat. IL 60601 www.mraa.com EMU33680 Boating organizations The following organizations provide boating EMU33690 Basic boating rules (Rules of...
Safety information vessel. Normally, you should not cross in front of the vessel with the right-of-way. You should slow down or change directions brief- ly and pass behind the other vessel. You should always move in such a way that the operator of the other vessel can see what you are doing.
Safety information trawls are considered to be “fishing vessels” under the International Rules. Vessels with trolling lines are not considered fishing ves- sels. Fishing vessels have the right-of-way regardless of position. Fishing vessels can- not, however, impede the passage of other vessels in narrow channels.
Page 17
Safety information This system uses buoys and signs with dis- tinctive shapes and colors to show regulato- ry or advisory information. These markers are white with black letters and orange boarders. They signify speed zones, restrict- ed areas, danger areas, and general infor- mation.
10% ethanol can cause fuel system Tighten the filler cap securely after re- damage or engine performance problems. fueling. Yamaha does not recommend gasohol-con- If you should swallow some gasoline, taining methanol because it can cause fuel inhale a lot of gasoline vapor, or get...
If the engine starts in gear, the boat can have a direct impact on acceleration, top move suddenly and unexpectedly, pos- speed, fuel economy, and even engine life. sibly causing a collision or throwing Yamaha designs and manufactures propel- lers for every Yamaha outboard motor and...
Basic components EMU2579D Main components NOTE: * May not be exactly as shown; also may not be included as standard equipment on all mod- els. Z300, LZ300 YAMAHA YAMAHA YAMAHA FUEL MANAGEMENT SPEED Km/h knot Km/L mile TRIP TIME BATT...
Basic components ZMU05429 1. Tachometer unit (Square type)* 2. Tachometer unit (Round type)* 3. Speedometer unit (Square type)* 4. Speed & fuel meter unit (Square type)* 5. Speed & fuel meter unit (Round type)* 6. Fuel management meter (Square type)* EMU26180 Remote control The remote control lever actuates both the...
Basic components used when the remote control lever is in NOTE: the neutral position. The neutral throttle lever will operate only After the button is pushed, the throttle be- when the remote control lever is in neutral. gins to open after the remote control lever The remote control lever will operate only is moved at least 35°.
Basic components moved. ZMU04646 When constant speed is desired, tighten the adjuster to maintain the desired throttle set- 1. Cord ting. 2. Clip EMU25991 Engine shut-off switch The clip must be attached to the engine shut- START START off switch for the engine to run. The cord should be attached to a secure place on the operator’s clothing, or arm or leg.
Basic components sition, the starter motor turns to start the en- gine. When the key is released, it returns automatically to the “ ” (on) position. EMU26152 Power trim and tilt switch on bottom engine cowling The power trim and tilt switch is located on the side of the bottom engine cowling.
Basic components For instructions on using the power trim and tilt switches, see pages 53 and 55. EMU26243 Trim tab with anode The trim tab should be adjusted so that the steering control can be turned to either the right or left by applying the same amount of force.
Basic components clamp bracket. ZMU01864 ECM00660 CAUTION: Do not use the tilt support lever or knob when trailering the boat. The outboard motor could shake loose from the tilt sup- port and fall. If the motor cannot be trail- ered in the normal running position, use an additional support device to secure it in the tilt position.
If the warning system has activated, stop hose and tap water. the engine and consult a Yamaha dealer NOTE: immediately. For details on usage, see page 63.
Basic components indicators, see page 47. 2. Oil level indicator ECM00030 CAUTION: EMU26492 Digital tachometer Do not operate the engine without oil. Se- The tachometer shows the engine speed rious engine damage will occur. and has the following functions. NOTE: All segments of the display will light momen- tarily after the main switch is turned on and will return to normal thereafter.
Basic components EMU26582 NOTE: Overheat-warning indicator (digital After the main switch is first turned on, all type) segments of the display come on as a test. If the engine temperature rises too high, the After a few seconds, the gauge will change warning indicator will start to blink.
Basic components engine has been run. It can be set to show the total number of hours or the number of hours for the current trip. The display can also be turned on and off. ZMU04581 NOTE: Memorize the trim angles that work best for your boat under different conditions.
ECM00860 CAUTION: NOTE: The trip distance is shown in kilometers or The Yamaha fuel tank sensor differs from miles depending upon the unit of measure- conventional sensors. Incorrectly setting ment selected for the speedometer. the selector switch on the gauge will give The trip distance is kept in memory by bat- false readings.
Get back to the port soon if a warning de- segments come on. vice has activated. For charging the bat- EMU26751 tery, consult your Yamaha dealer. Fuel flow meter The fuel flow meter displays the amount of fuel flow over a one-hour period, at the cur- rent rate of engine operation.
Basic components displays “ ” (for port and starboard). The fuel consumption meter and fuel economy meter will indicate the same unit of measurement. EMU26760 Fuel consumption meter This gauge displays the total amount of fuel consumed since the gauge was last reset. Press the “...
(winter or summer fuel and amount of additives). The Yamaha digital speedometer and fuel management meter calculates speed, miles traveled, and fuel economy by water movement at the stern of the boat. This...
7. Battery voltage display will be available. For the optional 8. Oil level (2-stroke models) sensor, consult your Yamaha dealer. The ta- chometer unit is available in round or square types. Check your tachometer unit type. ZMU05417 1.
Page 39
If the buzzer sounds and the wa- ous engine damage will occur. ter separator-warning indicator blinks, con- Overheat warning sult your Yamaha dealer immediately. If the engine temperature rises too high while NOTE: cruising, the overheat-warning indicator will To stop the buzzer, press the “...
Page 40
This indicator will blink when the engine mal- overheat-warning indicator blinks. Seri- functions while cruising. Get back to the port ous engine damage will occur. soon and consult a Yamaha dealer immedi- Do not continue to operate the engine if ately. a warning device has activated. Con- sult your Yamaha dealer if the problem cannot be located and corrected.
This unit shows the boat speed and has the In such an event, the engine will not oper- functions of fuel meter, total fuel consump- ate properly. Consult a Yamaha dealer tion display, fuel economy display, fuel flow immediately. display, and system voltage display. If op-...
If optional sensors are connected to the unit, trip display, water surface tempera- ture display, depth display, and clock will be available. For the optional sensor, consult your Yamaha dealer. ZMU05434 1. Set button 2. Mode button ZMU05436 1.
Basic components ZMU05437 ZMU05438 1. Speedometer 1. Set button 2. Fuel meter 2. Mode button 3. Multifunction display NOTE: After the main switch is first turned on, all the displays come on as a test. After a few sec- onds, the gauge will change to normal oper- ation.
Warning system ECM00090 CAUTION: Do not continue to operate the engine if a warning device has activated. Consult your Yamaha dealer if the problem can- not be located and corrected. EMU26825 Overheat warning This engine has the overheat warning de- vice.
Basic components on the engine not affected by overheating, turn off the main switch of the engine over- heating. EMU26847 Oil level warning and oil filter clogging warning Oil injection models This engine has an oil level warning system. If the oil level falls below the lower limit, the ZMU03025 warning system will activate.
Consult your engine overheating. If the engine is mounted Yamaha dealer or boat manufacturer for fur- too low, water resistance (drag) will in- ther information on determining the proper crease, thereby reducing engine efficiency mounting location.
Your new engine requires a period of break- ent heights can help determine the optimum in to allow mating surfaces of moving parts to mounting height. Consult your Yamaha deal- wear in evenly. Correct break-in will help en- er or boat manufacturer for further informa-...
Next 50 minutes: Check fuel line connections to be sure they Do not exceed half throttle (approxi- are tight (if equipped Yamaha fuel tank or mately 3000 r/min). Vary engine speed boat tank). occasionally. If you have an easy-plan-...
Operation indicator blinks, consult your Yamaha when starting or during operation. dealer immediately. Keep hands, hair, and clothes away EMU27120 from the flywheel and other rotating parts while the engine is running. Check to be sure you have plenty of oil for Watch for oil flowing through the oil feed your trip.
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, ZMU01876...
Page 52
Imp gal) can be added, and the bottom oil level line indicates approximately 3.8 L (1 US gal, 0.8 Imp gal) can be added. Turn on the main switch. The Yamaha oil injection system will automatically feed oil from the remote oil tank to the engine oil tank.
Operation EMU27321 Oil level indicator operation The various functions of the oil level system are as follows: EMU27382 Oil level indicator Electric start models Oil level- warning Oil level-warning Engine oil Remote oil indicator indicator (analog Remarks tank tank (digital tachometer) tachometer) more than 300...
Operation EMU27450 Operating engine EMU27482 Feeding fuel EWM00420 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 water near you. 1.
Page 55
Operation START START ZMU04588 ZMU04589 Attach the engine shut-off cord to a se- Turn the main switch to “ ” (on). cure place on your clothing, or your arm NOTE: or leg. Then install the clip on the other Dual engine users: When the main switch is end of the cord into the engine shut-off turned on, the buzzer operates for a few sec- switch.
” (on), wait check whether the cooling water inlet on 10 seconds, then crank the engine the lower case or the cooling water pilot again. hole is blocked. Consult your Yamaha dealer if the problem cannot be located and corrected. START ZMU01881...
Page 57
Operation idle speed can prevent you from shifting back to neutral. If this occurs, stop the engine, shift to neutral, then restart the engine and allow it to warm up. To shift out of neutral Pull the neutral interlock trigger up (if equipped).
Operation wind direction. EMU27820 Stopping engine Before stopping the engine, first let it cool off for a few minutes at idle or low speed. Stop- ping the engine immediately after operating at high speed is not recommended. EMU27853 Procedure Turn the main switch to “ ”...
Operation switch to “ ” (off). EMU27861 Trimming outboard motor The trim angle of the outboard motor helps determine the position of the bow of the boat in the water. Correct trim angle will help im- prove performance and fuel economy while reducing strain on the engine.
Operation not adjust the trim angle with this To raise the bow (trim-out), press the switch switch while the boat is moving. “ ” (up). To lower the bow (trim-in), press the switch Adjust the outboard motor trim angle using “...
Operation duce salt corrosion. EWM00221 WARNING Be sure all people are clear of the out- board motor when tilting up and down, Body parts can be crushed between the motor and the clamp bracket when the motor is trimmed or tilted. EWM00250 WARNING Bow Down...
Page 62
Operation ZMU04588 ZMU01954 Press the power trim and tilt switch “ ” Pull the tilt support lever toward you to (up) until the outboard motor has tilted support the engine. up completely. ZMU01886 EWM00261 WARNING After tilting the outboard motor, be sure to support it with the tilt support knob or tilt support lever.
Operation Models equipped with trim rods: Once Push the power trim and tilt switch “ ” the outboard motor is supported with the (down) to lower the outboard motor to tilt support lever, press the power trim the desired position. and tilt switch “...
Operation to allow operation in shallow water. desired position using the power trim and tilt switch. EWM00660 WARNING Place the gear shift in neutral before setting up for shallow water cruising. Return the outboard motor to its normal position as soon as the boat is back in deeper water.
Page 65
Cruising in muddy or turbid water Yamaha strongly recommends that you use the optional chromium-plated water pump kit (available for V4 and large engines) if you use the outboard motor in water with a lot of sediment in it, such as muddy or other turbid (cloudy) water.
Maintenance Bore × stroke: EMU31480 Specifications 93.0 × 82.0 mm (3.66 × 3.23 in) NOTE: Ignition system: “(AL)” stated in the specification data below Spark plug with resistor (NGK): represents the numerical value for the alumi- BKR6EKU num propeller installed. Spark plug gap: Likewise, “(SUS)”...
25.0 Nm (18.4 ft-lb) (2.55 kgf-m) sition using a motor support device such as Propeller nut: a transom saver bar. Consult your Yamaha 55.0 Nm (40.6 ft-lb) (5.61 kgf-m) dealer for further details. EMU28223...
For information on Fill the fuel tank with fresh fuel and add one spark plug installation, see page 68. ounce of “Yamaha Fuel Conditioner and Sta- Fill the oil tanks. This prevents the for- bilizer” to each gallon of fuel.
Batteries vary among Wax the cowling with a non-abrasive manufacturers. Therefore the following pro- wax such as “Yamaha Silicone Wax”. cedures may not always apply. Consult your EMU28431 battery manufacturer’s instructions. Battery care...
If necessary, clean ECM00540 and paint the areas. A touch-up paint is avail- CAUTION: able from your Yamaha dealer. Do not leave the garden hose connector loose on the bottom cowling fitting or let the hose hang free during normal opera-...
Be sure to turn off the engine when you perform maintenance unless otherwise specified. If you are not familiar with ma- chine servicing, this work should be done by your Yamaha dealer or other qualified mechanic. Maintenance, replacement, or repair of the emission control devices and sys- tems may be performed by any marine engine repair establishment or individual.
When operating in salt water, turbid or muddy water, the engine should be flushed with clean water after each use. The “ ” symbol indicates the check-ups which you may carry out yourself. The “ ” symbol indicates work to be carried out by your Yamaha dealer. Initial Every 50 hours Item...
Maintenance EMU28932 Greasing Yamaha marine grease (Water resistant grease) Z300, LZ300 ZMU01939 sparks, which could lead to explosion or EMU28953 Cleaning and adjusting spark plug fire. EWM00560 EWM01550 WARNING WARNING When removing or installing a spark plug, The engine will still be very hot when it be careful not to damage the insulator.
Check the fuel lines for leaks, crack, or mal- ZMU01892 function. If a problem is found, your Yamaha 1. Spark plug gap dealer or other qualified mechanic should re- 2. Spark plug I.D. mark (NGK) pair it immediately.
If you have difficulty ver- ifying the idle speed, or the idle speed re- quires adjustment, consult a Yamaha dealer or other qualified mechanic. Verify whether the idle speed is set to specification.
There is a water trap at the bottom of the en- leaks from the joints between the exhaust gine oil tank. If water or foreign matter is vis- cover, cylinder head, and body cylinder. ible in this trap, consult your Yamaha dealer. EMU29154 Checking power trim and tilt system EWM00431...
ZMU04935 NOTE: 1. Tilt support lever Consult your Yamaha dealer if any operation is abnormal. Check that the tilt rod and trim rods are EMU32110 free of corrosion or other flaws.
Maintenance EMU30661 Removing propeller EMU29196 Spline models Straighten the cotter pin and pull it out using a pair of pliers. Remove the propeller nut, washer, and spacer (if equipped). ZMU01896 ZMU01898 1. Cotter pin 2. Propeller nut ZMU01897 3. Washer Checkpoints 4.
Severe injury could eration and be lost. occur if the outboard motor accidental- ly falls. Apply Yamaha marine grease or a cor- rosion resistant grease to the propeller Tilt the outboard motor so that the gear shaft.
Page 81
Securely install the cooling water inlet into the gear case which can cause gear covers on both sides of the gear case damage. Consult a Yamaha dealer for re- using the bolt and nut removed earlier. pair of the lower unit seals.
Maintenance EMU29312 EMU29320 Inspecting and replacing anode(s) Checking battery (for electric start Yamaha outboard motors are protected from models) corrosion by sacrificial anodes. Inspect the EWM00330 WARNING external anodes periodically. Remove scales from the surfaces of the anodes. Consult a Battery electrolytic fluid is dangerous;...
1. Red cable NOTE: 2. Black cable Consult a Yamaha dealer when charging or 3. Battery re-charging batteries. Connecting an accessory battery (option) EMU29363...
(optional part) more rapid engine corrosion. NOTE: If a battery selector switch is desired, consult your Yamaha dealer about correct wiring. EMU29370 Disconnecting the battery Disconnect the BLACK cable from the NEG- ATIVE (-) terminal first. Then disconnect the RED cable from the POSITIVE (+) terminal.
Therefore some items may not apply to your model. 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-warning indicator is Q. Are spark plug(s) fouled or of incorrect flashing, consult your Yamaha dealer.
Page 86
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.
Page 87
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.
ECM00370 Q. Is steering pivot loose or damaged? CAUTION: A. Tighten or have serviced by a Yamaha If the boat is operated with one engine in dealer. the water but not running, water may run...
Loosen the manual valve screw by turn- electric system damage and a fire hazard. ing it counterclockwise until it stops. NOTE: Consult your Yamaha dealer if the new fuse immediately blows again. ZMU01905 1. Manual valve screw Put the engine in the desired position,...
Trouble Recovery EMU31781 coupler. Water separator-warning indicator ECM01570 blinks while cruising CAUTION: EWM01500 Be careful not to get any water on the wa- WARNING ter detection switch coupler, otherwise a Gasoline is highly flammable, and its va- malfunction could occur. pors are flammable and explosive.
ZMU01906 NOTE: Lift the emergency switch to pump re- Have a Yamaha dealer inspect the outboard serve oil into the engine oil tank from the motor after returning to port. remote oil tank. EMU29671...
Trouble Recovery EMU29760 Treatment of submerged motor If the outboard motor is submerged, immedi- ately take it to a Yamaha dealer. Otherwise some corrosion may begin almost immedi- ately. If you cannot immediately take the outboard motor to a Yamaha dealer, follow the proce-...
Page 93
Trouble Recovery plug holes while rotating the flywheel manually. ZMU01911 Take the outboard motor to a Yamaha dealer as soon as possible. ECM00400 CAUTION: Do not attempt to run the outboard motor until it has been completely inspected.