Yamaha 50A manual

40A/50A LIT -18626-04-55 40A 50A OWNER’S MANUAL U.S.A.Edition 63B-9-19 hyoshi 01.4.18 2:07 PM y[W 1 (2,1)[...]

63B-9-19 hyoshi 01.4.18 2:07 PM y[W 2 (1,1)[...]

E Thank you for choosing a Yamaha out- board motor. This Owner’s manual con- tains information needed for proper oper- ation, maintenance and care. A thorough understanding of these simple instruc- tions will help you obtain maximum enjoyment from your new Yamaha. If you have any question about the operation or maintenance of your outboard motor,[...]

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GENERAL INFORMA TION BASIC COMPONENTS OPERA TION MAINTENANCE TROUBLE RECOVERY INDEX EMA20010 CONTENTS READ THIS OWNER’S MANUAL CAREFULL Y BEFORE OPERA TING YOUR OUTBOARD MOTOR. 1 2 3 4 5 6 E 63B-9-19-1 (E) 4/18/01 11:35 AM Page 3[...]

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E 2 3 4 5 6 EMB00010 Chapter 1 GENERAL INFORMA TION IDENTIFICATION NUMBERS RECORD ....................................................1-1 Outboard motor serial number...........1-1 Key number...........................................1-1 EMISSION CONTROL INFORMATION ...1-2 SAFETY INFORMATION ..........................1-3 IMPORTANT LABELS ..........[...]

E 1-1 1 401012 904011 123 YAMAHA q EMU00005 IDENTIFICA TION NUMBERS RECORD EMU00007 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 num- ber in the spaces provided to assist you in ordering spare parts from your Yamaha dealer or f[...]

1-2 E 000909 q w EMU01385 EMISSION CONTROL INFORMA TION EMU01386 NORTH AMERICAN MODELS This engine conforms to U.S. Environ- mental Protection Agency (EPA) regula- tions for marine SI engines. See the label affixed to your engine for details. Approval label of Emission control certificate This label is attached to the bottom cowl- ing. 1 Emission c[...]

E 1-3 EMU00917 SAFETY INFORMA TION 8 Before mounting or operating the out- board motor, read this entire manual. Reading it should give you an under- standing of the motor and its operation. 8 Before operating the boat, read any owner’s or operator’s manuals supplied with it and all labels. Be sure you under- stand each item before operating. 8[...]

E 1-4 8 When a swimmer is in the water near you shift into neutral and shut off the engine. 8 Be informed about boating safety. Addi- tional publications and information can be obtained from many organizations, including the following: United States Coast Guard Consumer Affairs Staff (G-BC) Office of Boating, Public, and Consumer Affairs U.S. Coast[...]

WARNING This engine is equipped with a neutral starting device. The engine will not start unless the shift control is in neutral position. 6E0-83627-41 WARNING  Be sure shift control is in neutral before starting engine. (except 2HP) ê  Do not touch or remove electrical parts ê when starting or during operation.  Keep hands,hair[...]

E 1-6 EMB40010 BASIC BOA TING RULES (Rules of the road) Just as there are rules which apply when you are driving on streets and high ways, there are waterway rules which apply when you are driving your boat. These rules are used internationally, and are also enforced by the United States Coast Guard and local agencies. You should be aware of these [...]

E 1-7 RULES WHEN ENCOUNTERING VESSELS There are three main situations which you may encounter with other vessels which could lead to a collision unless the Steer- ing Rules are followed: Meeting (you are approaching another vessel head-on) Crossing (you are travelling across the other vessel’s path) Overtaking (you are passing or being passed by [...]

E its course and speed. You must stay out of its way until you are clear of it. Like- wise, if another vessel is passing you, you should maintain your speed and direction so that the other vessel can steer itself around you. OTHER SPECIAL SITUATIONS There are three other rules you should be aware of when driving your boat around other vessels. Narr[...]

E 1-9 1 1 1 A 1 1 1 Proceeding toward head of navigation from seaward CAN BUOY Odd number. Leave to port. OR SECONDARY CHANNEL BUOYS STARTS NEW NUMBERING SYSTEM old ne w C " 1 " NUN BUOY Even number. Leave to starboard N " 2 " No change BUOY COLOR CODE BLACK RED GREEN " A " " 2 " " 1 " " 3 &quo[...]

E 1-10 EMU00016 FUELING INSTRUCTIONS w GASOLINE AND ITS VAPORS ARE HIGH- LY FLAMMABLE AND EXPLOSIVE! 8 Do not smoke when refueling, and keep away from sparks, flames, or other sources of ignition. 8 Stop engine before refueling. 8 Refuel in a well-ventilated area. Refuel portable fuel tanks off the boat. 8 Take care not to spill gasoline. If gaso- [...]

EMU00018 GASOLINE (PETROL) If knocking or pinging occurs, use a differ- ent brand of gasoline or premium unlead- ed fuel. If unleaded gasoline is not avail- able, then leaded regular gasoline can be used. EMU00027 Gasohol There are two types of gasohol: gasohol containing ethanol and that containing methanol. Gasohol containing ethanol can be used [...]

EMU00031 BA TTERY REQUIREMENT c C Do not use the battery that does not meet the specified capacity. If different battery from the specification is used, the electric system may perform poorly or be overloaded, causing electrical system damage. Choose battery which meets the following specifications for Electric start model. Minimum cold crank perfo[...]

E 1-13 EMU01395 PROPELLER SELECTION The performance of your outboard motor will be critically affected by your choice of propeller, as an incorrect choice could adversely affect performance and could also seriously damage the motor. Engine speed depends on the propeller size and boat load. If engine speed is too high or too low for good engine perf[...]

1-14 E 602011 10-3/4x17-G 1 2 3 EMU01209 ST AR T -IN-GEAR PROTECTION Yamaha outboard motors or Yamaha approved remote control units are equipped with start-in-gear protection device(s). This feature permits the engine to be started only when it is Neutral. Always select Neutral before starting the engine. NOTE: At full throttle and under a maximum [...]

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E 1 2 3 4 5 6 EMC00010 Chapter 2 BASIC COMPONENTS MAIN COMPONENTS ..............................2-1 OPERATIONS OF CONTROLS AND OTHER FUNCTIONS ................................2-3 Fuel tank ................................................2-3 Multifunction tiller handle ...................2-4 Remote control .....................................2-7 Ch[...]

E 2-1 101133* w e r q t y u !6 !5 !4 !3 !2 !1 !0 o i EMU01206 MAIN COMPONENTS 1 Recoil starter handle 2 Multifunction tiller handle 3 Choke knob 4 Warning indicator lamp (Oil/Overheat) 5 Tilt lock lever 6 Transom clamp handle 7 Clamp bracket 8 Trim angle adjusting rod 9 Cooling water inlet 0 Propeller q Trim tab (Anode) w Anti-cavitation plate e An[...]

2-2 E !4 !5 !3 !2 !1 !0 o i t r w q y u e EMU01206 MAIN COMPONENTS 1 Oil filler access cap 2 Warning indicator lamp 3 Clamp bracket 4 Battery lead 5 Anode 6 Cooling water inlet 7 Propeller 8 Trim tab (Anode) 9 Anti-cavitation plate 0 Anode q Trim angle adjusting rod w Tilt support lever e Top cowling * r Remote control box * t Digital tachometer * [...]

2-3 E EMC20010 OPERA TIONS OF CONTROLS AND OTHER FUNCTIONS EMC21012 FUEL TANK If your model was equipped with a portable fuel tank, its function is as fol- lows. 1 Fuel hose joint 2 Fuel meter(If equipped) 3 Fuel tank cap 4 Air vent screw(If equipped) EMC31010 Fuel hose joint This connector is provided for connecting or disconnecting fuel hose. EMC[...]

2-4 E EMU00075 MULTIFUNCTION TILLER HANDLE The tiller handle centralized most of func- tions for the outboard motor operation. 1 Tiller handle 2 Gear shift lever 3 Throttle control grip 4 Throttle indicator 5 Throttle friction adjusting knob 6 Engine stop lanyard switch / Engine stop button(If equipped) EMU00079 Tiller handle Moving the tiller hand[...]

2-5 E EMC40210 Throttle indicator The fuel consumption curve on the throt- tle 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 Throttle indicator 501023 q 501042 501045* EMC64210 Throttle friction adjusting knob A frict[...]

2-6 E EMC28210 Engine stop lanyard switch The lock-plate on the end of the lanyard must be attached to the engine stop switch for the engine to run. The lanyard should be attached to a secure place on the operator’s clothing, or arm or leg. Should the operator fall overboard or leave the helm, the lanyard will pull out the lock plate, stopping ig[...]

2-7 E EMU00096* REMOTE CONTROL Both the shifter and the throttle are actu- ated by the remote control lever. Addi- tionally, the remote control also has the electrical switches. 1 Remote control lever 2 Neutral interlock trigger 3 Neutral throttle lever 4 Main switch 5 Engine stop lanyard switch 6 Power trim and tilt switch (if equipped) 7 Throttle[...]

2-8 E EMC50110 Neutral interlock trigger To shift out of Neutral, the neutral inter- lock trigger of the remote control lever must first be pulled up. EMC50210 Neutral throttle lever To open the throttle without shifting into either Forward or Reverse, place the remote control lever in the Neutral posi- tion and lift the neutral throttle lever. NOT[...]

2-9 E EMU01331 Power Trim/Tilt Switch The power trim/tilt adjusts the motor angle in relation to the transom. The power trim/tilt switch is located on the remote control lever grip. Pushing the switch “UP” trims the motor up, then tilts the motor up. Pressing the switch “DN” tilts the motor down and trims the motor down. When the switch but[...]

2-10 E EMC28210 Engine stop lanyard switch The lock-plate on the end of the lanyard must be attached to the engine stop switch for the engine to run. The lanyard should be attached to a secure place on the operator’s clothing, or arm or leg. Should the operator fall overboard or leave the helm, the lanyard will pull out the lock plate, stopping i[...]

2-11 E EMC87011 Throttle friction adjusting screw A friction device in the remote control box provides resistance to movement of the remote control lever. This is adjustable for operator preference. An adjusting screw is located at the front of the remote control box. w Do not overtighten the friction adjusting screw. If there is too much resistanc[...]

2-12 E 404015* 404011* EMD00011* STEERING FRICTION ADJUSTING SCREW 40MH A friction device provides resistance to steering movement. This is adjustable for operator preference. An adjusting screw/bolt is located on the swivel brack- et. 408015 EMU01297 TRIM ANGLE ADJUSTING ROD The position of the trim angle adjusting rod determines the minimum trim [...]

2-13 E 302013* DN UP 412012 EMD08110 SHALLOW WATER LEVER (If equipped) Pushing this lever down will tilt the motor up partially to provide more clearance when operating in shallow water. EMU01125 POWER TRIM/TILT SWITCH The power trim/tilt adjusts the motor angle in relation to the transom. The power trim/tilt switch is located on the side of the bo[...]

2-14 E 303016 q 303012* q EMU00120 WARNING INDICATOR If the engine develops a condition which is cause for warning, the indicator on the front of the bottom cowling lights up. The three indicators mounted on the bot- tom cowling also indicate level of the engine oil. Refer to the section “WARN- ING SYSTEM” for details of this function. 1 Warnin[...]

2-15 E EMU01614 DIGITAL TACHOMETER This gauge contains the tachometer, trim meter, hour meter, oil level indicator, and the overheat warning indicator. 1 Tachometer 2 Trim meter 3 Hour meter 4 Oil level indicator 5 Overheat warning indicator 6 Set button 7 Mode button NOTE: All segments of the display will light momentarily after the main switch is[...]

2-16 E EMU01109 Trim Meter This meter shows the trim angle of your outboard motor. NOTE: 8 Memorize the trim angles that work best for your boat under different condi- tions. Adjust the trim angle to the desired setting by operating the power trim and tilt switch. 8 If the trim angle of your motor exceeds the trim operating range, the top seg- ment[...]

2-17 E 001051 q 001052 q EMU01553 Overheat Warning Indicator If the engine temperature rises too high, the warning indicator will start to blink. Refer to “OVERHEAT WARNING” for details. 1 Overheat warning indicator c C Do not continue to operate the engine if a warning device has activated. If neces- sary, refer to the “TROUBLESHOOTING” se[...]

2-18 E EMD04011* TRIM TAB 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. w An improperly adjusted trim tab may cause difficult steering. Always test run after the trim tab has been installed or replaced to be sure steering is correct. Be sure you have tigh[...]

2-19 E EMD45010 TILT LOCK MECHANISM (for Hydro-tilt model) Tilt-lock mechanism is used to prevent reverse thrust from the propeller lifting the outboard motor when reversing. To lock it, set the tilt-lock lever in the Lock position. To release it, place the tilt-lock lever in the Tilt position. 1 Tilt-lock lever NOTE: The tilt-lock mechanism on the[...]

2-20 E EMD60210 TILT SUPPORT LEVER 40MH To keep the outboard motor in the tilted- up position, lock the tilt support lever to the swivel bracket. 403024 301013* q EMD60010 TILT SUPPORT LEVER Power trim & tilt/Hydro tilt model To keep the outboard motor in the tilted- up position, lock the tilt support lever to the clamp bracket. 403011 EMD62011[...]

2-21 E EMD82012* OVERHEAT WARNING This engine has an overheat warning device. If the engine temperature rises too high, the warning device will activate. ( 2 ); Included ( — ); N/A If the warning system has been activated, stop the engine and check the water inlet for clogging. *1. Digital tachometer *2. 40MH EMD80010 W ARNING SYSTEM c C Do not c[...]

2-22 E 001094 EMD84012* OIL LEVEL WARNING / OIL FILTER CLOGGING WARNING This engine has an oil level warning sys- tem. If oil level falls below lower limit, the warning device will activate. ( 2 ); Included ( — ); N/A If the warning system has been activated, stop the engine and check for the cause. NOTE: The warning for oil filter clogging is si[...]

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1 2 3 4 5 6 E EMF00010 Chapter 3 OPERA TION INSTALLATION ........................................3-1 Mounting the outboard motor ............3-2 Clamping the outboard motor ............3-4 FILLING FUEL AND ENGINE OIL ............3-5 Filling fuel ..............................................3-5 Filling oil ..........................................[...]

3-1 E EMF10010 INST ALLA TION c C Incorrect engine height or obstructions to smooth water flow (such as the design or condition of the boat or accessories such as transom ladders/depth finder trans- ducers) can create airborne water spray while the boat is cruising. Severe engine damage may result if the motor is operat- ed continuously in the pres[...]

E 3-2 EMF12012 MOUNTING THE OUTBOARD MOTOR w Improper mounting of the outboard motor could result in hazardous conditions such as poor handling, loss of control, or fire hazards. Observe the following: 8 The information presented in this sec- tion is intended as reference only. It is not possible to provide complete instructions for every possible [...]

E 3-3 w Overpowering a boat may cause severe instability. Do not install an outboard motor with more horsepower than the maximum rating on the capacity plate of the boat. If the boat does not have a capac- ity plate, consult the boat manufacturer. 104014 EMU01299 Mounting Height To run your boat at optimum efficiency, the water-resistance (drag) of[...]

E 3-4 EMU01318 CLAMPING THE OUTBOARD MOTOR 40MH 1) Place the outboard on the transom so that it is positioned as close to the center as possible. Tighten the tran- som clamp screws evenly and secure- ly. Check the clamp-screws for tight- ness occasionally during operation of the motor as they can work loose due to engine vibration. w Loose clamp sc[...]

E 3-5 EMF20010 FILLING FUEL AND ENGINE OIL EMF30011 FILLING FUEL 1) Remove the fuel tank cap. 2) Fill the fuel tank carefully. 3) Close the cap securely after refueling. Wipe up any spilled fuel. 902055 Fuel tank capacity: Refer to SPECIFICATIONS, page 4-1. EMU01019 Ring Free Fuel Additive Gasoline is a precise blend of many differ- ent substances,[...]

3-6 E EMF32011 FILLING OIL (for Precision blend system model) This engine uses the YAMAHA PRECI- SION BLEND SYSTEM, which provides superior lubrication by ensuring the prop- er oil ratio for all operating conditions. No fuel premixing is needed (except during break-in/running-ins). Simply pour gaso- line into the fuel tank and oil into the oil tank[...]

E 3-7 w q 203013* 203016* q w 203014 203015 EMF34110 Procedure Electric start model 1) Turn the oil filler access cap on top of the top cowling counterclockwise and open it. EMF34010 Procedure Manual start model 1) Remove the top cowling. 2) Open the oil tank filler cap by pulling the tab. 3) Slowly fill the engine oil into the engine oil tank. 4) [...]

3-8 E EMD33010 Oil level indicator Manual start model The various oil-level system functions are as follows: EMD33110 Oil level indicator Electric start model The various oil-level system functions are as follows: Oil level warning lamp Remarks Engine oil tank OFF No refilling necessary. more than 200 cm 3 (0.21 US qt, 0.181 Imp qt) Red ON Buzzer s[...]

E 3-9 EMF40012 PRE-OPERA TION CHECKS w If any item in the pre-operation check is not working properly, have it inspected and repaired before operating the out- board motor. Otherwise, an accident could occur. EMF41110 Fuel 8 Check to be sure you have plenty of fuel for your trip. 8 Make sure there are no fuel leaks or gasoline fumes. 8 Check fuel l[...]

E 3-10 EMF43510 Engine 8 Check the engine and engine mounting. 8 Look for loose or damaged fasteners. 8 Check the propeller for damage. c C Do not start the engine out of water. Overheating and serious engine damage can occur. EMF44010 OPERATION AFTER A LONG PERIOD OF STORAGE (for Precision blend system model) When operating the engine after a long[...]

E 3-11 EMF50112 BREAKING IN (RUNNING IN) ENGINE Your new engine requires a period of break-in (running-in) to allow mating sur- faces of moving parts to wear-in evenly. Correct break-in (running-in) will help ensure proper performance and longer engine life. c C 8 Failure to follow the break-in (running- in) procedure may result in reduced engine l[...]

E 3-12 EMU00227 Run the engine under load (in gear with a propeller installed) as follows. 1) First 10 minutes: Run the engine at the lowest possi- ble-speed. A fast idle in neutral is best. 2) Next 50 minutes: Do not exceed half throttle (approxi- mately 3,000 r/min). Vary engine speed occasionally. If you have an easy-planing boat, accelerate at [...]

E 902025 3-13 EMU01147 ST AR TING ENGINE w 8 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. 8 When the air vent screw is loosened, gasoline (petrol) vapor will be released. Gasoline (petrol) is highly flammable, and its vapo[...]

501023 E EMU00854 PROCEDURE FOR TILLER CONTROL MODEL 4) Place the gear-shift lever in the neu- tral position. NOTE: The start-in-gear protection device pre- vents the engine from starting except when in Neutral. 3-14 501024 N 000976 5) Place the throttle control grip in the “START” position. 6) Attach the engine stop switch lanyard to a secure [...]

3-15 E 305043* 209015 EMF63110 Manual start model 7) Pull out the choke knob completely. NOTE: It is not necessary to use the choke when restarting a warm engine. 8) To start the engine, pull the starter handle slowly until you feel resis- tance. Then, give a strong pull straight out to crank the engine. NOTE: If the engine fails to start on the fi[...]

E 3-16 EMF65010 PROCEDURE FOR REMOTE CONTROL MODEL 4) Place the remote control lever in the Neutral position. NOTE: 8 The start-in-gear protection device pre- vents the engine from starting except when in Neutral. 8 It is not necessary to open the free accelerator lever or Neutral throttle lever while starting. 5) Attach the engine stop switch lany[...]

3-17 E ON START OFF 701022 EMF63910 Electric start model 7) Turn the main switch to “START”, and hold it for a maximum of 5 seconds. 8) Immediately the engine starts, release the main switch to return it to “ON”. c C 8 Do not turn the main switch to “START” when the engine is running. 8 Do not keep the starter-motor turning for more tha[...]

3-18 E EMG00210 W ARMING UP ENGINE 1) Before beginning operation, allow the engine to warm up at idling speed for 3 minutes. (Failure to do this will shorten engine life.) 2) Check for a steady flow of water from the cooling-water pilot hole. c C A continuous flow of water from the pilot hole shows that the water pump is pumping water through the c[...]

3-19 E EMG20111 SHIFTING w Before shifting, make sure there are no swimmers or obstacles in the water near you. c C To change the shifting position from for- ward to reverse or vice-versa, close the throttle first so that the engine idles (or runs at low speeds). EMG22310 FORWARD Tiller control model 1) Place the throttle control grip in the fully [...]

3-20 E Tiller control model 3) Turn the gear-shift lever quickly and firmly from Neutral to Reverse. 402051 501031 N R N R 701044 EMU01326 REVERSE w When operating in Reverse, go slowly. Do not open the throttle more than half. Oth- erwise, the boat may become unstable, which could result in loss of control and an accident. 1) Place the throttle co[...]

3-21 E EMG38010 STOPPING ENGINE Let it cool off for a few minutes at idle or low speed first. Stopping the engine immediately after operating at high speed is not recommended. EMG35210 PROCEDURE Button switch equipped model 1) Push and hold the engine stop switch (If button switch equipped on the switch) until the engine comes to a complete stop. N[...]

3-22 E EMG35310 PROCEDURE Main switch equipped model 1) Turn the main switch to “OFF”. NOTE: The engine can also be stopped by pulling the lanyard from the engine stop switch (then turning the main switch to “OFF”). ON START OFF 701023 304036 902052 2) If the fuel joints are provided, discon- nect the fuel line from the motor after stopping[...]

3-23 E 000862 q EMU01412 TRIMMING OUTBOARD MOTOR The trim angle of the outboard motor helps determine the position of the bow of the boat in the water. The correct trim angle will help improve performance and fuel economy while reducing strain on the engine. The correct trim angle depends upon the combination of boat, engine, and propeller. Correct[...]

3-24 E ADJUSTING TRIM ANGLE EMU00951 Manual tilt model There are 4 or 5 holes provided in the clamp bracket to adjust the outboard motor trim angle. 1) Stop the engine. 2) Remove the trim angle adjusting rod 1 from the clamp bracket while tilting the motor up slightly. 3) Reposition the rod in the desired hole. To raise the bow (“trim-out”), mo[...]

3-25 E UP DN 701034 UP DN q EMU01401 Power Trim/Tilt Model w 8 Be sure all people are clear of the out- board motor when adjusting the trim/tilt angle, also be careful not to pinch any body parts between the drive unit and clamp bracket. 8 Use caution when trying a trim position for the first time. Increase speed gradu- ally and watch for any signs[...]

3-26 E EMG62010 Bow up When the boat is on plane, a bow-up atti- tude result in less drag, greater stability and efficiency. This is generally when the keel line of the boat is up about 3 to 5 degrees. When trimmed out, the boat may have more tendency to steer to one side or the other. Compensate for this as you steer. The trim tab can also be adju[...]

3-27 E 000817 EMH10110 TIL TING UP/DOWN If the engine will be stopped for some time, or if the boat is moored in shallows, the engine should be tilted up to protect the propeller and casing from damage by collision with obstructions, and also to reduce salt corrosion. c C 8 Before tilting the motor, follow the pro- cedures under “STOPPING ENGINE?[...]

3-28 E EMG63010 PROCEDURE FOR TILTING UP Manual tilt model 1) Remove the fuel-line connection from the motor. (If the fuel connector is provided on the motor.) 304036 402035 403024 2) Place the tilt-lock lever in Release. 3) Hold the rear of the top cowling with one hand, tilt the engine up, and turn the tilt-support lever to the locked position an[...]

3-29 E EMG63110 PROCEDURE FOR TILTING UP Hydro-tilt model 1) Remove the fuel-line connection from the motor. 304036 402011* 403011 2) Place the tilt-lock lever in the release position. 3) Hold the rear of the top cowling with one hand, tilt the engine up, and turn the tilt-support lever toward you and support the engine. 63B-9-19-3B (E) 4/18/01 11:[...]

3-30 E EMG63210 PROCEDURE FOR TILTING UP Power trim and tilt model 1) Remove the fuel-line connection from the motor. 304036 UP DN 701034 UP DN 302013* DN UP 403011 2) Push the power trim and tilt switch “UP” until the outboard has tilted up completely. 3) Turn the tilt-support lever toward engine bracket and support the engine. w After tilting[...]

3-31 E EMG73210* PROCEDURE FOR TILTING DOWN Manual tilt model 1) Return the tilt support lever tilting up the engine slightly. 2) Tilt down the engine. 411035 EMG64110 PROCEDURE FOR TILTING DOWN Power trim and tilt model 1) Push the power trim and tilt switch “UP” until the engine is supported by the tilt rod. 2) Release the tilt-support lever.[...]

3-32 E 000832 EMG70011* CRUISING IN SHALLOW W A TER Manual tilt model The outboard motor can be tilted up par- tially to allow operation in shallow water. w 8 Place the gear shift in the Neutral posi- tion before using the shallow water cruising system. 8 Run the boat at the lowest possible speed when using the shallow water cruising system. The ti[...]

3-33 E 412012 501024 N 412022 EMG71410 PROCEDURE 1) Place the gear shift lever in the neu- tral position. 2) Push the shallow water lever down to the release position. 3) For setting the outboard motor at the partially tilted position, slightly tilt up the engine until the plate turns com- pletely 4) To return the engine to the normal position, put[...]

3-34 E 402011 000832 EMG70311 CRUISING IN SHALLOW W A TER Hydro tilt model The engine can be tilted up partially to allow operation in shallow water. w 8 Place the gear shift in the Neutral posi- tion before setting for the shallow water cruising. 8 Return the engine to its normal posi- tion as soon as the boat is back in deeper water. c C Do not t[...]

3-35 E EMH60010 CRUISING IN OTHER CONDITIONS CRUISING IN SALT WATER After operating in salt water, wash out the cooling-water passages with fresh water to prevent them from becoming clogged- up with salt deposits. NOTE: Refer to cooling system flushing instruc- tions in “TRANSPORTING AND STORING OUTBOARD MOTOR”. CRUISING IN TURBID WATER It is s[...]

1 2 3 4 5 6 E EMK00010 Chapter 4 MAINTENANCE SPECIFICATION DATA .............................4-1 TRANSPORTING AND STORING OUTBOARD MOTOR ...............................4-3 Trailering outboard motor ...................4-3 Storing outboard motor ......................4-4 PERIODIC MAINTENANCE ......................4-9 Replacement parts ...............[...]

Model Unit 40MHA Item 4-1 E DIMENSIONS PERFORMANCE 8 Overall Length mm (in.) 8 Overall Width mm (in.) 8 Overall Height S/L/X mm (in.) 8 Transom height S/L/X mm (in.) 8 Weight S/L/X kg (lb.) 1,281 (50.4) 349 (13.7) —/1,350 (53.1)/— —/533 (21.0)/— —/77.5 (171)/— 8 Full throttle operating range r/min 8 Maximum output kW (HP) 8 Idling speed[...]

E 4-2 4,500–5,500 29.4 (40) at 5,000 r/min 750–850 646 (25.4) 360 (14.2) —/1,319 (51.9)/1,464 (57.6) —/533 (21.0)/647 (25.5) —/88 (194)/91.5 (202) 670 (26.4) 360 (14.2) —/1,319 (51.9)/— —/533 (21.0)/— —/88.0 (194)/— 25 (2.5, 18) 35 (3.5, 25) Forward-Neutral-Reverse 1.85 (24/13) Power trim and tilt G Forward-Neutral-Reverse 1.8[...]

4-3 E EMU01369* TRANSPORTING AND STORING OUTBOARD MOTOR w Leaking fuel is a fire hazard. When trans- porting and storing the outboard motor, close the air vent screw and fuel cock to prevent fuel from leaking. TRAILERING OUTBOARD MOTOR The motor should be trailered and stored in the normal running position. If there is insufficient road clearance i[...]

E 4-4 EMK16010 STORING OUTBOARD MOTOR When storing your Yamaha outboard for prolonged periods of time, (2 months or longer), several important procedures must be performed to prevent expensive damage. This is especially important for your Precision Blend equipped outboard due to the lean oil ratios used at idle prior to shutting the engine off for [...]

E 4-5 605024 q w EMK22511 Flushing Cooling System and Fogging Engine Cooling system flushing is essential to prevent the cooling system from clogging up with salt, sand, or dirt. In addition, fog- ging of the engine is mandatory to pre- vent expensive engine damage due to rust. Perform the flushing and fogging at the same time. 8 Flushing in a wate[...]

E 4-6 4) Just prior to turning off the engine, quickly spray “Yamaha Stor-Rite Engine Fogging Oil” (Part No. LUB- STRRT-12-00) alternately into each carburetor. When properly done, the engine will smoke excessively and almost stall. 8 Flushing with the flushing attachment 1) Remove the top cowling and silencer cover. Remove the propeller. 2) In[...]

4-7 E EMK26112 Lubrication 1) Remove the spark plugs, and spray a 10 second spray of “Yamaha Stor- Rite Engine Fogging Oil” into each cylinder. Grease the spark plug threads and reinstall the spark plugs and torque to proper specification. (Refer to “CLEANING AND ADJUST- ING SPARK PLUG”.) 2) Turn the engine over with the stop lanyard discon[...]

E 4-8 EMK29010 Battery Care w Battery electrolyte is poisonous and dan- gerous, causing severe burns, etc. It con- tains sulfuric acid. Avoid contact with skin, eyes, or clothing. Antidote: EXTERNAL; Flush with water. INTERNAL; Drink large quantities of water or milk. Follow with milk of mag- nesia, beaten egg, or vegetable oil. Call physician imme[...]

E 4-9 EMK32110 PERIODIC MAINTENANCE w Be sure to turn off the engine when you perform maintenance unless otherwise specified. If the owner is not familiar with machine servicing, this work should be done by a Yamaha dealer or other quali- fied mechanic. A service manual is available for purchase through a Yamaha dealer for owners who have the mecha[...]

4-10 E *1. for Power trim and tilt model *2. If equipped *3. When operating in salt water, turbid or muddy water, the engine should be flushed with clean water after each use. EMK30114* MAINTENANCE CHART Frequency of maintenance operations may be adjusted according to the operating con- ditions, but the following table gives general guidelines. The[...]

4-11 E EMU00366 GREASING Yamaha marine grease (Water resistant grease) 63B-9-19-4 (E) 4/18/01 11:40 AM Page 12[...]

4-12 E EMU00366 GREASING Yamaha marine grease (Water resistant grease) 63B-9-19-4 (E) 4/18/01 11:40 AM Page 13[...]

4-13 E EMU01202 CLEANING AND ADJUSTING SPARK PLUG w 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. The spark plug is an important engine component and is easy to inspect. The condition of the spark plug can indicate something a[...]

E 4-14 When fitting the plug, always clean the gasket surface and use a new gasket. Wipe off any dirt from the threads and screw in the spark plug to the correct torque. NOTE: If a torque-wrench is not available when you are fitting a spark plug, a good esti- mate of the correct torque is 1/4 to 1/2 a turn past finger-tight. Have the spark plug adj[...]

E 4-15 EMK38010 CHECKING FUEL SYSTEM w Gasoline (petrol) and its vapors are highly flammable and explosive. Keep away from sparks, cigarettes, flames or other sources of ignition. Check the fuel line for leaks, cracks, or malfunctions. If any problem is found, it should be repaired immediately by Yama- ha dealer or other qualified mechanic. Checkin[...]

E 4-16 EMK50011 CLEANING FUEL FILTER w Gasoline (petrol) is highly flammable, and its vapors are flammable and explosive. 8 If you have any question about properly doing this procedure, consult your Yamaha dealer. 8 Do not perform this procedure on a hot or running engine. Allow the engine to cool. 8 There will be fuel in the fuel filter. Keep away[...]

E 4-17 5) Attach the filter assembly to the bracket with that the fuel hoses are attached to the filter assembly. 6) Run the engine and check the filter and lines for leaks. 1 Filter element 2 O-ring 3 Filter cap 4 Filter housing EMK54110 ADJUSTING IDLING SPEED w 8 Do not touch or remove electrical parts when starting or during operation. 8 Keep ha[...]

E 4-18 2) Adjust the throttle stop-screw to set the idling speed to specification (see “SPECIFICATIONS”) by turning the stop-screw clockwise to increase the idling speed, and turning it counter- clockwise to decrease the idling speed. NOTE: Correct idling-speed adjustment is only possible if the engine is fully warmed-up. If not warmed up fully[...]

E 4-19 EMU01329 REPLACING FUSE If the fuse has blown on an Electric start model, open the fuse holder and replace the fuse with a new one of proper amper- age. w Be sure to use the specified fuse. An incorrect fuse or a piece of wire may allow excessive current flow. This could cause electrical system damage and a fire hazard. NOTE: If the new fuse[...]

E 4-20 EMU00992 CHECKING POWER TRIM AND TILT SYSTEM w 8 Never get under the lower unit while it is tilted, even when the tilt-support lever is locked. Severe injury could occur if the outboard accidentally falls. 8 Make sure no one is under the out- board before performing this test. 1) Check the power trim and tilt unit for any sign of oil leaks. [...]

E 4-21 EML08011* CHECKING PROPELLER w You could be seriously injured if the engine accidentally starts while you are near the propeller. 8 Before inspecting, removing or installing the propeller, remove the spark plug caps from the spark plugs. Also, put the shift control in Neutral, put the main switch in the “OFF” posi- tion and remove the ke[...]

E 4-22 1 Thrust washer 2 Propeller 3 Spacer 4 Washer 5 Propeller nut 6 Cotter pin Installation 1) Apply Yamaha Marine grease (water- resistant grease) to the propeller- shaft. 2) Slide the propeller over the propeller- shaft. c C Be sure to install the thrust washer before installing propeller, otherwise, lower case and propeller boss may be damage[...]

E 4-23 EMU01460 CHANGING GEAR OIL w 8 Be sure the outboard is securely fas- tened to the transom or a stable stand. You could be severely injured if the out- board falls on you. 8 Never get under the lower unit while it is tilted, even when the tilt-support lever/knob is locked. Severe injury could occur if the outboard accidentally falls. 1) Tilt [...]

E 4-24 5) With the outboard motor in a vertical position, and using a flexible or pres- surized filling device, inject the gear oil into the oil drain plug hole. 6) When the oil begins to flow out of the oil level plug hole, insert and tighten the oil level plug. 7) Insert and tighten the oil drain plug. 601015 Gear oil grade/capacity: Refer to “[...]

E 4-25 To clean the fuel tank 1) Empty the fuel tank into an approved gasoline (petrol) container. 2) Pour a small amount of suitable sol- vent in the tank. Reinstall the cap and shake the tank. Drain the solvent completely. To clean the fuel filter 1) Remove the screws holding the fuel hose joint assembly . Pull the assem- bly out of the tank. 2) [...]

E 4-26 EML26010 CHECKING BATTERY (for Electric start model) w Battery electrolytic fluid is dangerous; it contains sulfuric acid and therefore is poi- sonous and highly caustic. Always follow these preventive mea- sures: 8 Avoid bodily contact with electrolytic fluid as it can cause severe burns or permanent eye injury. 8 Wear protective eye gear w[...]

E 4-27 1) Check the electrolyte level at least once a month. Fill to the manufactur- er’s recommended level when neces- sary. Top up only with distilled water (or pure de-ionized water suitable to use in batteries). c C Ordinary tap-water contains minerals harmhul to a battery, and should not be used for topping-up. 2) Keep the battery always in [...]

E 4-28 EMU01280 Disconnecting the Battery Disconnect the BLACK lead from the NEG- ATIVE (-) terminal first. Then disconnect the RED lead from the POSITIVE (+) termi- nal. UPPER LEVEL LOWER LEVEL 901012 q w e EMU01279 Connecting the Battery w Mount the battery holder securely in a dry, well-ventilated, vibration-free loca- tion in the boat. Install [...]

E 4-29 EML42011 MOTOR EXTERIOR Cleaning the Outboard Motor After use, wash the exterior of the out- board with fresh water. Flush the cooling system with fresh water. Cleaning cooling-water passages NOTE: Refer to cooling system flushing instruc- tions in “TRANSPORTING AND STORING OUTBOARD MOTOR”. Checking Painted Surface of Motor Check the mot[...]

1 2 3 4 5 6 E EMN00010 Chapter 5 TROUBLE RECOVER Y TROUBLESHOOTING ..............................5-1 TEMPORARY ACTION IN EMERGENCY ............................................5-5 Impact damage .....................................5-5 Power trim/tilt will not operate ...........5-5 Starter will not operate ........................5-6 Engine fails to[...]

5-1 E EMU01204¯ TROUBLESHOOTING A problem in the fuel, compression, or ignition systems can cause poor starting, loss of power, or other problems. The troubleshooting chart describes basic checks and possi- ble remedies. (This chart covers all Yamaha outboard motors. Therefore, some items may not apply to your model.) If your outboard motor requir[...]

E 5-2 C. Engine idles irregularly or stalls. Trouble Possible Cause Remedy 1. Spark plug(s) fouled or incorrect type. 2. Fuel system obstructed. 3. Fuel contaminated or stale. 4. Fuel filter clogged. 5. Failed ignition parts. 6. Warning system activated. 7. Spark plug gap incorrect. 8. Poor connections or damaged ignition wiring. 9. Specified engin[...]

5-3 E D. Warning buzzer sounds or indicator lamp lights. Trouble Possible Cause Remedy 1. Cooling system clogged. 2. Engine oil level low. 3. Heat range of spark plug incorrect. 4. Specified engine oil not used. 5. Engine oil contaminated or deteriorated. 6. Oil filter clogged. 7. Oil feed/injection pump malfunctions. 8. Load on boat improperly dis[...]

E 5-4 Trouble Possible Cause Remedy 13. Poor connections or damaged ignition wiring. 14. Failed ignition parts. 15. Specified engine oil not used. 16. Thermostat faulty or clogged. 17. Air vent screw closed. 18. Fuel pump damaged. 19. Fuel joint connection incorrect. 20. Heat range of spark plug incorrect. 13. Check wires for wear or breaks. Tighte[...]

5-5 E EMN20010 TEMPORARY ACTION IN EMERGENCY EMH80010 IMPACT DAMAGE w The outboard motor can be seriously damaged by a collision while operating or trailering. Damage could make the out- board motor unsafe to operate. If the outboard motor hits any object in the water, follow the procedure below; 1) Stop the engine immediately . 2) Inspect control [...]

E 5-6 EMN30310 STARTER WILL NOT OPERATE If the starter mechanism does not operate (engine cannot be cranked with the starter), the engine can be started with an emergency starter rope. w 8 Use this procedure only in an emer- gency and only to return to port for repairs. 8 When the emergency starter rope is used to start the engine, the start-in- ge[...]

E 5-7 Procedure 1) Remove the top cowling. 2) Remove the starter/flywheel cover by removing the bolts. NOTE: On a model equipped with the start-in- gear protection device (cable), disconnect the cable from the starter. 208025 208026 ON START OFF 701024 208052 3) Prepare the engine for starting. See “STARTING ENGINE” for procedures. Be sure the [...]

E 5-8 EMN32411 ENGINE FAILS TO OPERATE Cold engine fails to start (for Prime start model) If a cold engine fails to start, use the fol- lowing procedure. 1) Adjust the trim angle so that the drive shaft is at right angles to the water surface or is trimmed in. 214011 OPEN CLOSE 902025 N 701014 2) Open the emergency starter valve located behind the [...]

E 5-9 5) Set the MAIN SWITCH to “ON”. 6) Set the MAIN SWITCH to “START”. NOTE: When the starter mechanism malfunctions , refer to “STARTER WILL NOT OPERATE”. c C 8 Do not turn the main switch to “START” when the engine is running. 8 Do not keep the starter-motor turning for more than 5 seconds with the main switch in the “START”[...]

E 5-10 EMN50011 TREATMENT OF SUBMERGED MOTOR If the outboard motor is submerged, immediately take it a Yamaha dealer. Oth- erwise, some corrosion may begin almost immediately. If you cannot immediately take the outboard motor to a Yamaha dealer, follow the procedure bellow for taking care to minimize engine damage. 1) Thoroughly wash away mud, salt[...]

E -MEMO- 63B-9-19-5 (E) 4/18/01 11:41 AM Page 12[...]

EMP00010 Chapter 6 INDEX INDEX ........................................................6-1 1 2 3 4 5 6 E 63B-9-19-6 (E) 4/18/01 11:43 AM Page 1[...]

6-1 EMP10010 INDEX A Adjusting idling speed .......................... 4-17 Adjusting trim angle ..............................3-24 Air vent screw...........................................2-3 B Basic boating rules ..................................1-6 Battery care...............................................4-8 Battery requirement ..............[...]

6-2 Motor exterior ........................................4-29 Mounting height ......................................3-3 Mounting the outboard motor ...............3-2 Multifunction tiller handle .......................2-4 N Neutral interlock trigger ..........................2-8 Neutral throttle lever ...............................2-8 O Oil leve[...]

EMU01599 IMPORT ANT W ARRANTY INFORMA TION FOR U.S.A. AND CANADA Welcome to the Yamaha Family! Congratulations on the purchase of your new Yamaha marine power. Yamaha is commit- ted to exceptional customer satisfaction, and we want your ownership experience to be a satisfying one. Please read the following warranty information to help ensure satisf[...]

5. Your warranty applies specifically to repairs made in the country of purchase. If your U.S.-purchased Yamaha needs warranty service while in Canada, or your Canadian pur- chased Yamaha needs service while in the United States, Yamaha will assist the local dealer whenever possible. However, some products available in one country may not be sold o[...]

EMU00912* Y AMAHA MOTOR CORPORA TION, U.S.A. OUTBOARD MOTOR TWO YEAR LIMITED W ARRANTY Yamaha Motor Corporation, U.S.A. is proud of its heritage and reputation for producing products with high standards of quality and workmanship. Product excellence provides the cornerstone for our commitment to customer satisfaction. The Yamaha Outboard Limit- ed [...]

SPECIFIC PARTS EXCLUDED FROM WARRANTY. Parts replaced due to normal wear or routine maintenance such as oil, spark plugs, shear pins, propellers, hubs, fuel and oil filters, brushes for the starter motor and power tilt motor, water pump impellers, and anodes are not covered by warranty. Charges for removal of the motor from a boat and transporting [...]

CUSTOMER SERVICE If your machine requires warranty service, you must take it to any authorized Yamaha outboard dealer within the continental Uni ted States. Be sure to bring your warranty registration identification or other valid proof of the original date of purchase. If a question or problem arises regarding warranty, first contact the owner of [...]

EMU01178 IMPORT ANT W ARRANTY INFORMA TION IF YOU USE YOUR Y AMAHA OUTSIDE U.S.A. OR CANADA Welcome to the Yamaha Family! Congratulations on the purchase of your new Yamaha marine power. Yamaha is com- mitted to exceptional customer satisfaction, and we want your ownership experience to be a satisfying one. Please read the following warranty inform[...]

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40A/50A Printed in Japan March 2001—0.5 × 1 ! 63B-28199-19 (40VMHO,40VETO, 50HETO, 50EJDO) (E) Printed on recycled paper OWN 63B-9-19 hyoshi 01.4.18 2:07 PM y[W 1 (1,1)[...]

40A/50A Printed in Japan March 2001—0.5 × 1 ! 63B-28199-19 (40VMHO,40VETO, 50HETO, 50EJDO) (E) Printed on recycled paper OWN 63B-9-19 hyoshi 01.4.18 2:07 PM y[W 1 (1,1)[...]