U6M81EMC 09.4.2 10:05 AM ページ 1 8 OWNER’S MANUAL U.S.A.
U6M81EMC 09.4.2 10:05 AM ページ 2 EMU25062 ZMU01690 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.
Important manual information EMU31283 To the owner Thank you for choosing a Yamaha outboard motor. This Owner’s Manual contains information needed for proper operation, maintenance and care. A thorough understanding of these simple instructions will help you obtain maximum enjoyment from your new Yamaha. If you have any question about the operation or maintenance of your outboard motor, please consult a Yamaha dealer.
Table of contents Safety information............................. 1 Outboard motor safety .................... 1 Engine oil requirements ................ 15 Fuel requirements ......................... 15 Propeller............................................ 1 Rotating parts.................................... 1 Hot parts ........................................... 1 Electric shock .................................... 1 Engine shut-off cord (lanyard)........... 1 Gasoline ..................................
Table of contents Engine shut-off cord (lanyard)......... 27 Oil.................................................... 27 Engine ............................................. 28 Install cowling.................................. 28 Filling fuel and engine oil............... 28 Filling fuel for portable tank ............. 28 Gasoline and oil mixing (100:1) ...... 29 Operating engine........................... 30 Sending fuel (portable tank) ............ 30 Starting engine ................................
Safety information EMU33622 Outboard motor safety Observe these precautions at all times. EMU36501 Propeller People can be injured or killed if they come in contact with the propeller. The propeller can keep moving even when the motor is in neutral, and sharp edges of the propeller can cut even when stationary. ● Stop the engine when a person is in the water near you. ● Keep people out of reach of the propeller, even when the engine is off.
Safety information death when inhaled. Symptoms include nausea, dizziness, and drowsiness. Keep cockpit and cabin areas well ventilated. Avoid blocking exhaust outlets. EMU33780 Modifications Do not attempt to modify this outboard motor. Modifications to your outboard motor may reduce safety and reliability, and render the outboard unsafe or illegal to use. EMU33740 Boating safety This section includes a few of the many important safety precautions that you should follow when boating.
Safety information Operate defensively at safe speeds and keep a safe distance away from people, objects, and other boats. ● Do not follow directly behind other boats or waterskiers. ● Avoid sharp turns or other maneuvers that make it hard for others to avoid you or understand where you are going. ● Avoid areas with submerged objects or shallow water. ● Ride within your limits and avoid aggressive maneuvers to reduce the risk of loss of control, ejection, and collision.
Safety information location, but all are basically the same as the International Rules of the Road. The rules presented in the following section are condensed- and have been provided for your convenience only. Contact the U.S. Coast Guard, the National Association of State Boating Law Administrators, or your local Power Squadron for a complete set of rules governing the waters in which you will be using your boat.
Safety information vessel will be able to determine how best to avoid you. Give-way vessel The vessel that does not have the right-ofway has the duty to take positive and timely action to stay out of the way of the Stand-On vessel. Normally, you should not cross in front of the vessel with the right-of-way. You should slow down or change directions briefly 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 you are the Give-Way vessel. If the other vessel is on your port (left) side, remember that you should maintain course and direction, provided the other vessel gives you the right-of-way as it should. Overtaking If you are passing another vessel, you are the “Give-Way” vessel. This means that the other vessel is expected to maintain its course and speed. You must stay out of its way until you are clear of it.
Safety information black buoys to starboard. Many bodies of water used by boaters are entirely within the boundaries of a particular state. The Uniform State Waterway Marking System has been devised for these waters. This system uses buoys and signs with distinctive shapes and colors to show regulatory or advisory information. These markers are white with black letters and orange boarders. They signify speed zones, restricted areas, danger areas, and general information.
Safety information ZMU01708 8
General information EMU25171 Identification numbers record EMU25183 Outboard motor serial number The outboard motor serial number is stamped on the label attached to the port side of the clamp bracket. 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 stolen. 1 ZMU02836 1.
General information EMU33520 Read manuals and labels Before operating or working on this motor: ● Read this manual. ● 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.
General information 1 2 3 ZMU05697 11
General information EMU35132 Symbols The following symbols mean as follows.
Specifications and requirements EMU31480 Specifications TIP: “(AL)” stated in the specification data below represents the numerical value for the aluminum propeller installed. Likewise, “(SUS)” represents the value for stainless steel propeller installed and “(PL)” for plastic propeller installed. EMU2821E Dimension: Overall length: 802 mm (31.6 in) Overall width: 343 mm (13.5 in) Overall height S: 977 mm (38.5 in) Transom height S: 436 mm (17.2 in) Weight (AL) S: 27.
Specifications and requirements Propeller nut: 17.0 Nm (1.73 kgf-m, 12.5 ft-lb) EMU33554 Installation requirements EMU33563 Boat horsepower rating EWM01560 WARNING Overpowering a boat can cause severe instability. Before installing the outboard motor(s), confirm that the total horsepower of your motor(s) does not exceed the boats maximum horsepower rating. See the boat’s capacity plate or contact the manufacturer.
Specifications and requirements Gasohol) gasoline whenever possible. x 1 Recommended gasoline: Regular unleaded gasoline with a minimum Octane rating of 86 (Pump Octane Number) = (R+M)/2 2 3 ECM01981 NOTICE ZMU04605 1. Propeller diameter in inches 2. Propeller pitch in inches 3. Type of propeller (propeller mark) EMU25770 Start-in-gear protection Yamaha outboard motors or Yamaha-approved remote control units are equipped with start-in-gear protection device(s).
Specifications and requirements 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 concerns about pollution and resulting emissions regulations. 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.
Specifications and requirements engine for details. EMU30390 Approval label of emission control certificate This label is attached to the bottom cowling. Existing Technology; N/A 1 1 ZMU02838 1. Manufactured date label location ZMU06311 1. Approval label location Manufactured: EMISSION CONTROL INFORMATION ENGINE FAMILY : THIS ENGINE CONFORMS TO 2001 U.S. EPA REGULATIONS FOR MARINE SI ENGINES. REFER TO THE OWNERS MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
Components EMU2579M Components diagram TIP: * May not be exactly as shown; also may not be included as standard equipment on all models. 8 15 1 3 14 13 12 11 10 9 4 5 2 17 6 16 8 7 1. Manual starter handle 2. Engine stop button/Engine shut-off switch 3. Choke knob 4. Throttle grip 5. Throttle friction adjuster 6. Clamp screw 7. Cooling water inlet 8. Anti-cavitation plate 9. Trim rod 10. Shallow water lever 11. Restraint cable attachment 12. Tilt support knob 13. Cooling water pilot hole 14.
Components tions. 4 1 3 2 ZMU02846 ZMU04499 EMU25922 Gear shift lever 1. Fuel tank cap 2. Fuel gauge 3. Air vent screw 4. Fuel joint EMU25830 Fuel joint This joint is used to connect the fuel line. EMU25841 Pulling the gear shift lever towards you puts the engine in forward gear so that the boat moves ahead. Pushing the lever away from you puts the engine in reverse gear so that the boat moves astern.
Components or throttle grip, which could result in an accident. [EWM00032] ZMU02848 EMU25961 ZMU02850 Throttle indicator The fuel consumption curve on the throttle indicator shows the relative amount of fuel consumed for each throttle position. Choose the setting that offers the best performance and fuel economy for the desired operation. 1 ZMU02849 1.
Components EMU26070 Manual starter handle To start the engine, first gently pull the handle out until resistance is felt. From that position, then pull the handle straight out quickly to crank the engine. 1 2 3 ZMU02851 1. Clip 2. Cord 3. Engine shut-off switch EMU26001 Engine stop button To open the ignition circuit and stop the engine, push this button.
Components difficult to steer, which could result in an accident. EMU26261 Trim rod (tilt pin) The position of the trim rod determines the minimum trim angle of the outboard motor in relation to the transom. ZMU02855 ECM00660 NOTICE ZMU02853 EMU26280 Shallow water lever Pushing this lever down will tilt the motor up partially to provide more clearance when operating in shallow water. Do not use the tilt support lever or knob when trailering the boat.
Installation EMU26902 Installation The information presented in this section is intended as reference only. It is not possible to provide complete instructions for every possible boat and motor combination. Proper mounting depends in part on experience and the specific boat and motor combination. EWM01590 1 WARNING ● ● Overpowering a boat could cause severe instability. Do not install an outboard motor with more horsepower than the maximum rating on the capacity plate of the boat.
Installation EMU26972 Clamping the outboard motor 1. 0–25mm (0–1in) ZMU02011 ECM01631 NOTICE ● ● Check that the idle hole stays high enough to keep out water getting inside engine even if the boat is in stationary with maximum load. Incorrect engine height or obstructions to the smooth flow of water (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.
Installation ZMU02013 3. Secure the clamp bracket to the transom using the bolts provided with the outboard (if packed). For details, consult your Yamaha dealer. WARNING! Avoid using bolts, nuts or washers other than those contained in the engine packaging. If used, they must be of at least the same quality of material and strength and must be tightened securely. After tightening, test run the engine and check their tightness. [EWM00651] 1 ZMU02637 1.
Operation EMU36381 First-time operation EMU30174 Breaking in engine 3. Your new engine requires a period of breakin to allow mating surfaces of moving parts to wear in evenly. Correct break-in will help ensure proper performance and longer engine life. NOTICE: Failure to follow the break-in procedure could result in reduced engine life or even severe engine damage. [ECM00801] EMU27060 Gasoline and engine oil mixing chart (50:1) 4. 5. plane, then immediately reduce the throttle to 3000 r/min or less.
Operation the outboard unsafe to operate. EMU37141 Fuel level Be sure you have plenty of fuel for your trip. A good rule is to use 1/3 of your fuel to get to the destination, 1/3 to return, and to keep 1/ 3 as an emergency reserve. With the boat level on a trailer or in the water, check the fuel level. For fuel filling instructions, see page 28. EMU36570 EMU36451 Check for fuel leaks Check for fuel leaks or gasoline fumes in the boat. ● Check for fuel leakage from the fuel system.
Operation EMU27141 Engine ● ● ● Check the engine and engine mounting. Look for loose or damaged fasteners. Check the propeller for damage. EMU36953 Install cowling 1. 2. 3. 4. 5. Be sure that a cowling lock lever is released. Be sure that the rubber seal is seated all the way around the top cowling. Place the top cowling on bottom cowling. Check to be sure the rubber seal fits correctly all the way around the engine. Move the lever to lock the cowling as shown.
Operation ZMU04484 ZMU06621 9. Tighten the filler cap securely. 10. Wipe up any spilled gasoline immediately with dry rags. Dispose rags properly according to local laws or regulations. EMU27406 Gasoline and oil mixing (100:1) ECM00811 NOTICE ● 3. 4. 5. 6. 7. 8. Remove the portable tank from the boat. Be sure you are in a well-ventilated outdoor area, either securely moored or trailered. Do not smoke and keep away from sparks, flames, static electric discharge, or other sources of ignition.
Operation 3. 1L (0.26 US gal, 0.22 Imp gal) 100:1 12 L 14 L (3.2 US gal, (3.7 US gal, 2.6 Imp gal) 3.1 Imp gal) 24 L (6.3 US gal, 5.3 Imp gal) 0.01 L (0.01 US qt, 0.01 Imp qt) 0.12 L (0.13 US qt, 0.11 Imp qt) 0.24 L (0.25 US qt, 0.21 Imp qt) 0.14 L (0.15 US qt, 0.12 Imp qt) ZMU04910 1. : Gasoline 2. : Engine oil If equipped with a portable fuel tank 1. Pour oil into the portable fuel tank, and then add gasoline. Shake the fuel tank to mix the fuel thoroughly. 4.
Operation Symptoms include nausea, dizziness, and drowsiness. Keep cockpit and cabin 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 fuel line to the joint on the fuel tank. TIP: Wipe up any spilled gasoline immediately with dry rags. Dispose rags properly according to local laws or regulations.
Operation ● 1. (start) position. where it could become entangled, preventing it from functioning. Avoid accidentally pulling the cord during 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. Place the gear shift lever in neutral. 4. Pull out / turn the choke knob fully. After the engine starts, replace / return the knob to the home position.
Operation EMU36510 Checks after starting engine EMU36520 Cooling water 6. After the engine starts, slowly return the manual starter handle to its original position before releasing it. Slowly return the throttle grip to the fully closed position. 7. Check for a steady flow of water from the cooling water pilot hole. A continuous flow of water from the pilot hole shows that the water pump is pumping water through the cooling passages.
Operation down position (if equipped) before operating in reverse. shorten engine life. Gradually return the choke knob to its home position as the engine warms up. EMU36530 R Checks after engine warm-up N F EMU36540 Shifting While tightly moored, and without applying throttle, confirm that the engine shifts smoothly into forward and reverse, and back to neutral. ZMU05921 EMU36970 Stop switches ● ● ● Press the engine stop button and make sure the engine stops.
Operation EMU31742 Stopping boat EWM01510 WARNING ● ● Do not use the reverse function to slow down or stop the boat as it could cause you to lose control, be ejected, or impact 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. 2.
Operation EMU27862 Trimming outboard motor EWM00740 WARNING Excessive trim for the operating conditions (either trim up or trim down) can cause boat instability and can make steering the boat more difficult. This increases the possibility of an accident. If the boat begins to feel unstable or is hard to steer, slow down and/or readjust the trim angle. The trim angle of the outboard motor helps determine the position of the bow of the boat in the water.
Operation bow up, the boat may have a greater tendency to steer to one side or the other. Compensate for this as you steer. When the bow of the boat is down, it is easier to accelerate from a standing start onto plane. 1 ZMU02859 1. Trim rod 3. Reposition the rod in the desired hole. To raise the bow (“trim-out”), move the rod away from the transom. To lower the bow (“trim-in”), move the rod toward the transom.
Operation the bow is greatly increased, heightening the danger of “bow steering” and making operation difficult and dangerous. Otherwise fuel may leak. ECM00231 NOTICE ● ● ● TIP: Depending on the type of boat, the outboard motor trim angle may have little effect on the trim of the boat when operating.
Operation ZMU02887 3. 4. Place the tilt lock lever (if equipped) in the release/up position. Pull up the shallow water lever (if equipped). EMU28013 Procedure for tilting down (manual tilt models) 1. 2. Slightly tilt the engine up. On models equipped with a tilt support knob, pull it out. ZMU02854 5. 6. 39 Hold the rear of the top cowling with one hand and tilt the engine up fully. Push the tilt support knob into the clamp bracket.
Operation ● the water, resulting in loss of control. Use extra care when operating in reverse. Too much reverse thrust can cause the outboard motor to lift out of the water, increasing the chance of accident and personal injury. 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 setting up for and cruising in shallow water. Otherwise severe damage from overheating can result. ZMU02854 3. 4.
Maintenance EMU28227 Transporting and storing outboard motor EWM00693 WARNING ● ● USE CARE when transporting fuel tank, whether in a boat or car. DO NOT fill fuel container to maximum capacity. Gasoline will expand considerably as it warms up and can build up pressure in the fuel container. This can cause fuel leakage and a potential fire hazard.
Maintenance lowing procedures. ECM01411 NOTICE ● ● Do not place the outboard motor on its side before the cooling water has drained from it completely, otherwise water may enter the cylinder through the exhaust port and cause engine trouble. Store the outboard motor in a dry, wellventilated place, not in direct sunlight. EMU28304 1 2 ZMU02051 1. Water surface 2. Lowest water level Procedure EMU28376 5.
Maintenance 9. Remove the outboard motor from the test tank. 10. Drain the cooling water completely out of the motor. Clean the body thoroughly. 11. Install the silencer cover/cap and top cowling. EMU28402 Lubrication 1. 2. 3. Install the spark plug(s) and torque to proper specification. For information on spark plug installation, see page 48. Change the gear oil. For instructions, see page 51. Inspect the oil for the presence of water that indicates a leaky seal.
Maintenance tems may be performed by any marine engine repair establishment or individual. All warranty repairs, however, including those to the emission control system, must be performed by an authorized Yamaha marine dealership. A service manual is available for purchase through your Yamaha dealer for owners who have the mechanical skills, tools, and other equipment necessary to perform maintenance not covered by this owner’s manual. mendations.
Maintenance EMU34445 Maintenance chart 1 TIP: Refer to the sections in this chapter for explanations of each owner-specific action. The maintenance cycle on these charts assume usage of 100 hours per year and regular flushing of the cooling water passages. Maintenance frequency should be adjusted when operating the engine under adverse conditions such as extended trolling. ● Disassembly or repairs may be necessary depending on the outcome of maintenance checks.
Maintenance Initial Item Fuel line(Low pressure) Fuel pump Actions Inspection Gear oil Replacement Greasing points Greasing Impeller/water pump housing Impeller/water pump housing Propeller/propeller nut/ cotter pin Inspection or replacement as necessary Spark plug(s) Spark plug caps/spark plug wires Water from the cooling water pilot hole Throttle link/throttle cable/throttle pick-up timing Thermostat 300 hours (3 years) 500 hours (5 years) Replacement Inspection or replacement as necessary In
Maintenance EMU34451 Maintenance chart 2 Every Item Actions 1000 hours Exhaust guide/exhaust manifold 47 Inspection or replacement as necessary
Maintenance EMU28932 Greasing Yamaha marine grease (Water resistant grease) 8 ZMU02872 EMU28956 Cleaning and adjusting spark plug The spark plug is an important engine component and is easy to inspect. The condition of the spark plug can indicate something about the condition of the engine. For example, if the center electrode porcelain is very white, this could indicate an intake air leak or carburetion problem in that cylinder. Do not attempt to diagnose any problems yourself.
Maintenance 2. Remove the spark plug. If electrode erosion becomes excessive, or if carbon and other deposits are excessive, you should replace the spark plug with another of the correct type. WARNING! When removing or installing a spark plug, be careful not to damage the insulator. A damaged insulator could allow external sparks, which could lead to explosion or fire. [EWM00561] Standard spark plug: B7HS-10 3. Be sure to use the specified spark plug, otherwise the engine may not operate properly.
Maintenance the outboard motor is in the water. A flushing attachment or test tank can be used. If the boat is not equipped with a tachometer for the outboard motor, use a diagnostic tachometer for this procedure. Results may vary depending on whether testing is conducted with the flushing attachment, in a test tank, or with the outboard motor in the water. 1. Start the engine and allow it to warm up fully in neutral until it is running smoothly. 2.
Maintenance ● Check the propeller shaft oil seal for damage. 2. EMU30662 Removing propeller EMU29197 Spline models 1. Straighten the cotter pin and pull it out using a pair of pliers. 2. Remove the propeller nut, washer, and spacer (if equipped). WARNING! Do not use your hand to hold the propeller when loosening the propeller nut. 3. [EWM01890] Propeller nut tightening torque: 17.0 Nm (1.73 kgf-m, 12.5 ft-lb) 1 4. 3 2 5 rosion resistant grease to the propeller shaft.
Maintenance ● 1. 2. 3. fastened to the transom or a stable stand. You could be severely injured if the outboard motor falls on you. Never get under the lower unit while it is tilted, even when the tilt support lever or knob is locked. Severe injury could occur if the outboard motor accidentally falls. Tilt the outboard motor so that the gear oil drain screw is at the lowest point possible. Place a suitable container under the gear case. Remove the gear oil drain screw and gasket.
Maintenance drain screw. Tightening torque: 9 Nm (0.9 kgf-m, 6.6 ft-lb) EMU29302 Cleaning fuel tank EWM00920 WARNING Gasoline is highly flammable, and its vapors are flammable and explosive. ● If you have any question about properly doing this procedure, consult your Yamaha dealer. ● Keep away from sparks, cigarettes, flames, or other sources of ignition when cleaning the fuel tank. ● Remove the fuel tank from the boat before cleaning it. Work only outdoors in an area with good ventilation.
Maintenance anodes on equipped models. Consult a Yamaha dealer for inspection and replacement of internal anodes attached to the power unit.
Trouble Recovery EMU29427 Troubleshooting A problem in the fuel, compression, or ignition systems can cause poor starting, loss of power, or other problems. This section describes basic checks and possible remedies, and covers all Yamaha outboard motors. Therefore some items may not apply to your model. If your outboard motor requires repair, bring it to your Yamaha dealer. If the engine trouble-alert indicator is flashing, consult your Yamaha dealer. Starter will not operate. Q.
Trouble Recovery Q. Is fuel system obstructed? A. Check for pinched or kinked fuel line or other obstructions in fuel system. Q. Is fuel contaminated or stale? A. Fill tank with clean, fresh fuel. Q. Is fuel filter clogged? A. Clean or replace filter. Q. Have ignition parts failed? A. Have serviced by a Yamaha dealer. Q. Has alert system activated? A. Find and correct cause of alert. Q. Is spark plug gap incorrect? A. Inspect and adjust as specified. Q. Is ignition wiring damaged or poorly connected? A.
Trouble Recovery Q. Is load on boat improperly distributed? A. Distribute load to place boat on an even plane. on gear housing? A. Remove foreign matter and clean lower unit. Q. Is water pump or thermostat faulty? A. Have serviced by a Yamaha dealer. Q. Is fuel system obstructed? A. Check for pinched or kinked fuel line or other obstructions in fuel system. Q. Is there excess water in fuel filter cup? A. Drain filter cup. Q. Is fuel filter clogged? A. Clean or replace filter. Engine power loss. Q.
Trouble Recovery Q. Is fuel joint connection incorrect? A. Connect correctly. Q. Is heat range of spark plug incorrect? A. Inspect spark plug and replace it with recommended type. trailering. Damage could make the outboard motor unsafe to operate. If the outboard motor hits an object in the water, follow the procedure below. Q. Is high pressure fuel pump drive belt broken? A. Have serviced by a Yamaha dealer. Q. Is engine not responding properly to shift lever position? A.
Trouble Recovery ● ● ● ● ● ● could result in an accident. Attach the engine shut-off cord to a secure place on your clothing, or your arm or leg while operating the boat. Do not attach the cord to clothing that could tear loose. Do not route the cord where it could become entangled, preventing it from functioning. Avoid accidentally pulling the cord during normal operation. Loss of engine power means the loss of most steering control. Also, without engine power, the boat could slow rapidly.
Trouble Recovery ZMU02860 6. 7. Insert the knotted end of the emergency starter rope into the notch in the flywheel rotor and wind the rope several turns around the flywheel clockwise. Give a strong pull straight out to crank and start the engine. Repeat if necessary. ZMU02885 EMU33501 Treatment of submerged motor If the outboard motor is submerged, immediately take it to a Yamaha dealer. Otherwise some corrosion may begin almost immediately.
Consumer information EMU29820 YAMAHA MOTOR CORPORATION, U.S.A.
Consumer information 62
Consumer information 63
Consumer information EMU29841 IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR YAMAHA OUTSIDE THE USA OR CANADA 64
U6M81EMC 09.4.
U6M81EMC 09.4.
