Yamaha 70 Owner'S Manual Download

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OWNER’S MANUAL

6H3-28199-1W

U.S.A.Edition

LIT-18626-07-93

Read this manual carefully before operating this

outboard motor.

6H3-9-1W Hyoshi 08.2.11 9:35 AM ページ 1

Summary of Contents for 70

Page 1: ...70 OWNER S MANUAL 6H3 28199 1W U S A Edition LIT 18626 07 93 q Read this manual carefully before operating this outboard motor 6H3 9 1W Hyoshi 08 2 11 9 35 AM ページ 1 ...

Page 2: ...ead 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 6H3 9 1W Hyoshi 08 2 11 9 35 AM ページ 2 ...

Page 3: ... death or serious injury NOTICE ECM00701 A NOTICE indicates special precautions that must be taken to avoid damage to the outboard motor or other property TIP A TIP provides key information to make pro cedures easier or clearer Yamaha continually seeks advancements in product design and quality Therefore while this manual contains the most current prod uct information available at the time of prin...

Page 4: ...power rating 14 Mounting motor 14 Remote control requirements 14 Battery requirements 14 Specifications of Battery 14 Mounting battery 14 Multiple batteries 15 Propeller selection 15 Start in gear protection 15 Engine oil requirements 15 Fuel requirements 15 Gasoline 15 Ring Free Fuel Additive 16 Muddy or acidic water 16 Anti fouling paint 16 Motor disposal requirements 17 Emergency equipment 17 E...

Page 5: ...c start models 40 Oil level indicator operation 42 Operating engine 42 Feeding fuel portable tank 42 Starting engine 43 Checks after starting engine 46 Cooling water 46 Warming up engine 46 Electric start and prime start models 46 Checks after engine warm up 46 Shifting 46 Stop switches 46 Shifting 47 Stopping boat 48 Stopping engine 48 Procedure 48 Trimming outboard motor 49 Adjusting trim angle ...

Page 6: ...the battery 70 Trouble Recovery 71 Troubleshooting 71 Temporary action in emergency 74 Impact damage 74 Replacing fuse 74 Power trim and tilt will not operate 75 Starter will not operate 75 Emergency starting engine 76 Engine fails to operate 77 Ignition system malfunction 77 Cold engine fails to start 77 Treatment of submerged motor 79 Consumer information 80 Important warranty information for U ...

Page 7: ... mo tor and the clamp bracket when the motor is trimmed or tilted Keep body parts out of this area at all times Be sure no one is in this area before operating the power trim and tilt mechanism The power trim and tilt switches operate even when the main switch is off Keep peo ple be away from the switches whenever working around the motor Never get under the lower unit while it is tilt ed even whe...

Page 8: ...for every occupant Yamaha recommends that you must wear a PFD whenever boating At a minimum children and non swimmers should always wear PFDs and everyone should wear PFDs when there are potentially hazardous boat ing conditions EMU33730 People in the water Always watch carefully for people in the wa ter such as swimmers skiers or divers whenever the engine is running When someone is in the water ...

Page 9: ...nforcement agency if their boat is involved in any of the following accidents 1 There is loss of life or probable loss of life 2 There is personal injury that requires medical attention beyond first aid 3 There is property damage to boats or other property over a certain amount 4 There is complete loss of a boat Contact local law enforcement personnel if a report is necessary EMU33870 Boat educati...

Page 10: ...ion about boating safety and laws United States Coast Guard Consumer Affairs Staff G BC Office of Boating Public and Consumer Af fairs U S Coast Guard Headquarters Washington D C 20593 0001 Boating Safety Hotline 1 800 368 5647 www uscgboating org United States Power Squadrons 1 888 FOR USPS 1 888 367 8777 www usps org Boat Owners Association of The United States 1 800 336 BOAT 1 800 336 2628 www ...

Page 11: ...e had to all dangers of naviga tion and collision and to any special circum stances which may render a departure from the above rules necessary in order to avoid immediate danger In other words follow the standard rules ex cept when a collision will occur unless both vessels try to avoid each other If that is the case both vessels become Give Way vessels EMU25521 Rules when encountering vessels Th...

Page 12: ...cal to do so If the operator of a power driven vessel is preparing to go around a bend that may obstruct the view of other wa ter vessels the operator should sound a pro longed blast on the whistle 4 to 6 seconds If another vessel is around the bend it too should sound the whistle Even if no reply is heard however the vessel should still pro ceed around the bend with caution If you navigate such w...

Page 13: ...r into port and black buoys are to port left side When navigating out of port your posi tion with respect to the buoys should be re versed red buoys should be to port and 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 w...

Page 14: ...Safety information 8 ZMU01708 ...

Page 15: ...ber 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 EMU25190 Key number If a main key switch is equipped with the mo tor the key identification number is stamped on your key as shown in the illustration Record this number in the space provided for reference in case you need a new key 1 Outboard motor seria...

Page 16: ...r 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 3 2 1 ZMU06181 ...

Page 17: ...General information 11 1 2 3 ZMU05670 ...

Page 18: ... mean as follows Notice Warning Read Owner s Manual Hazard caused by continuous rotation Electrical hazard Remote control lever gear shift lever operat ing direction dual direction Engine start Engine cranking ZMU05696 ZMU05664 ZMU05665 ZMU05666 ZMU05667 ZMU05668 ...

Page 19: ...Displacement 849 0 cm3 Bore stroke 72 0 69 5 mm 2 83 2 74 in Ignition system CDI micro computer Spark plug NGK B8HS 10 Spark plug gap 0 9 1 0 mm 0 035 0 039 in Control system Remote control Starting system Electric Starting carburetion system Prime start Min cold cranking amps CCA SAE 380 0 A Min marine cranking amps MCA ABYC 502 0 A Min reserve capacity RC SAE 124 minutes Maximum generator output...

Page 20: ...33 EMU33581 Remote control requirements WARNING EWM01580 If the engine starts in gear the boat can move suddenly and unexpectedly pos sibly causing a collision or throwing passengers overboard If the engine ever starts in gear the start in gear protection device is not working correctly and you should dis continue using the outboard Contact your Yamaha dealer The remote control unit must be equipp...

Page 21: ...perating range at full throttle with the maximum boat load Generally chose a larger pitch propel ler for a smaller operating load and a smaller pitch propeller for a heavier load If you carry loads that vary widely chose the propeller that lets the engine run in the proper range for your maximum load but remember that you may need to reduce your throttle setting to stay within the recommended engi...

Page 22: ... Additive Gasoline is a precise blend of many different substances each chosen to give certain characteristics Gasoline blends have been changing in recent years in response to con cerns about pollution and resulting emis sions regulations One of the most obvious changes has been the elimination of lead from most fuels As gasoline has changed the amount of ad ditives such as aromatics and oxygenat...

Page 23: ...ith clip Spare parts such as an extra set of spark plugs Consult your Yamaha dealer for details EMU25221 Emission control information EMU25230 North American models This engine conforms to U S Environmental Protection Agency EPA regulations for ma rine SI engines See the label affixed to your engine for details EMU30390 Approval label of emission control certif icate This label is attached to the ...

Page 24: ...Specifications and requirements 18 1 Manufactured date label location 1 ZMU04893 ...

Page 25: ...cated fuel reservoir and must not be used as a fuel storage container Com mercial users should conform to relevant licensing or approval authority regula tions 14 15 13 16 1 10 2 3 4 5 6 7 8 9 11 12 ZMU04945 1 Top cowling 2 Top cowling lock lever 3 Anti cavitation plate 4 Trim tab anode 5 Propeller 6 Cooling water inlet 7 Anode 8 Trim rod 9 Clamp bracket 10 Tilt support knob 11 Power trim and tilt...

Page 26: ...oth the shifter and the throttle The electrical switch es are mounted on the remote control box EMU26190 Remote control lever Moving the lever forward from the neutral po sition engages forward gear Pulling the le ver back from neutral engages reverse The engine will continue to run at idle until the le ver is moved about 35 a detent can be felt Moving the lever farther opens the throttle and the ...

Page 27: ...e only when the remote control lever is in neutral The remote control lever will operate only when the neutral throttle lever is in the closed position EMU25911 Tiller handle To change direction move the tiller handle to the left or right as necessary EMU25922 Gear shift lever Pulling the gear shift lever towards you puts the engine in forward gear so that the boat moves ahead Pushing the lever aw...

Page 28: ...y for the desired operation EMU25973 Throttle friction adjuster A friction device provides adjustable resis tance to movement of the throttle grip or the remote control lever and can be set accord ing to operator preference To increase resistance turn the adjuster clockwise WARNING Do not overtighten the friction adjuster If there is too much resistance it could be difficult to move the remote con...

Page 29: ...r power WARNING At tach the engine shut off cord to a secure place on your clothing or your arm or leg while operating Do not attach the cord to clothing that could tear loose Do not route the cord where it could become en tangled preventing it from functioning Avoid accidentally pulling the cord dur ing normal operation Loss of engine power means the loss of most steering control Also without eng...

Page 30: ...n ad justing screw or bolt is located on the clamp bracket on the right starboard side of the through tube end To increase resistance turn the adjuster clockwise To decrease resistance turn the adjuster counterclockwise WARNING EWM00040 Do not overtighten the friction adjuster If there is too much resistance it could be difficult to steer which could result in an accident EMU26143 Power trim and t...

Page 31: ...d distract the operator increasing the risk of collision with another boat or an obsta cle EMU26244 Trim tab with anode WARNING EWM00840 An improperly adjusted trim tab could cause difficult steering Always test run after the trim tab has been installed or re placed to be sure steering is correct Be sure you have tightened the bolt after ad justing the trim tab The trim tab should be adjusted so t...

Page 32: ... 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 EMU26372 Top cowling lock lever s turn type To remove the engine top cowling turn the lock lever s and lift off the cowling When in stalling the cowling check to be sure it fits properly in the rubber seal Then ...

Page 33: ...Components 27 1 Top cowling lock lever s ZMU02596 1 ...

Page 34: ... conditions Adjust the trim angle to the desired using the power trim and tilt switch If the trim angle of your motor exceeds the trim operating range the top segment on the trim meter display will blink EMU26651 Hour meter This meter shows the number of hours the 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...

Page 35: ...r further in formation on reading the indicator see page 31 NOTICE ECM00052 Do not continue to run the engine if the overheat alert indicator is on Serious en gine damage will occur EMU26471 Analog tachometer This gauge shows the engine speed and has the following functions EMU26541 Oil level indicators three indicators The indicators on the gauge show the status of the oil level For details on ho...

Page 36: ...his gauge shows the trim angle of your out board motor Memorize the trim angles that work best for your boat under different conditions Adjust the trim angle to the desired setting with the power trim and tilt switch 1 Oil level indicators ZMU04580 1 ZMU04581 ...

Page 37: ...ndicator will light or blink The buzzer will sound if equipped on the tiller handle remote control box or main switch panel If the alert system has activated stop the en gine and check the cooling water inlets Check trim angle to be sure that the cool ing water inlet is submerged Check the cooling water inlet for clogging EMU26848 Oil level alert and oil filter clogging alert Oil injection models ...

Page 38: ...r main switch panel If the alert system has been activated stop the engine and check for the cause TIP The alert for oil filter clogging is similar to the alerts for low oil level and overheating To make troubleshooting easier check for en gine overheating first then oil level and fi nally oil filter clogging ZMU04586 ZMU03942 1 Oil filter ZMU03828 1 ...

Page 39: ...t is well balanced Otherwise the boat could be hard to steer For single en gine boats mount the outboard motor on the centerline keel line of the boat EMU26931 Mounting height boat bottom The mounting height of your outboard motor affects its efficiency and reliability If it is mounted too high propeller ventilation may occur which will reduce propulsion due to excessive propeller slip and the wat...

Page 40: ... ning Incorrect engine height or obstructions to the smooth flow of water such as the design or condition of the boat or ac cessories such as transom ladders or depth finder transducers can create airborne water spray while the boat is cruising If the motor is operated con tinuously in the presence of airborne water spray enough water could enter the engine through the intake opening on the cowlin...

Page 41: ...sy plan ing boat accelerate at full throttle onto plane then immediately reduce the throttle to 3000 r min or less 3 Next two hours Accelerate at full throttle onto plane then reduce engine speed to three quar ter throttle approximately 4000 r min Vary engine speed occasionally Run at full throttle for one minute then allow about 10 minutes of operation at three quarter throttle or less to let the...

Page 42: ...WM00060 Gasoline and its vapors are highly flam mable and explosive Keep away from sparks cigarettes flames or other sources of ignition WARNING EWM00910 Leaking fuel can result in fire or explo sion Check for fuel leakage regularly If any fuel leakage is found the fuel system must be repaired by a qualified mechanic Improper repairs can make the outboard unsafe to operate EMU36450 Check for fuel ...

Page 43: ...rottle levers several times to make sure there is no hesitation in their travel Operation should be smooth over the complete range of motion and each le ver should return completely to the idle po sition Look for loose or damaged connections of the throttle and shift cables under the en gine cowling EMU36481 Engine shut off cord lanyard Inspect the engine shut off cord for damage such as cuts brea...

Page 44: ...M00130 Be sure to take the above steps when op erating the engine after a long period of storage Otherwise engine seizure could occur EMU36961 Install cowling 1 Be sure that all cowling lock levers are released 2 Be sure that the rubber seal is seated all the way around the engine 3 Place the cowling on top of the seal 4 Check to be sure the rubber seal fits cor rectly all the way around the engin...

Page 45: ...xtend ed completely 4 Use the tilt support lever to lock the mo tor in the up position Operate the tilt down switch briefly so the motor is sup ported by the tilt support lever 5 Check that the tilt rod and trim rods are free of corrosion or other flaws 6 Activate the tilt down switch until the trim rods have retracted completely into the cylinders 7 Activate the trim up switch until the tilt rod ...

Page 46: ...ignition 5 If you use a portable container to store and dispense fuel use only an approved GASOLINE container 6 Touch the fuel nozzle to the filler open ing or funnel to help prevent electrostatic sparks 7 Fill the fuel tank but do not overfill Fuel can expand and overflow if the tempera ture increases 8 Tighten the filler cap securely 9 Wipe up any spilled gasoline immediate ly with dry rags Disp...

Page 47: ...il tank filler cap by pulling the tab on the cap 3 Slowly pour the engine oil into the en gine oil tank 4 After filling replace the all caps secure ly 1 Oil filler access cap 2 Oil tank filler cap ZMU03369 ZMU03370 ZMU03371 2 1 ...

Page 48: ...ng the air vent screw This product emits exhaust gases which contain carbon monoxide a col orless odorless gas which could cause brain damage or death when inhaled Symptoms include nausea dizziness and drowsiness Keep cockpit and cab in areas well ventilated Avoid blocking exhaust outlets 1 If there is an air vent screw on the fuel Oil level alert indicator digital tachometer Oil level alert indic...

Page 49: ...structions Be sure there are no swimmers in the wa ter near you EMU27595 Electric start prime start models WARNING EWM01840 Failure to attached engine shut off cord could result in a runaway boat if opera tor is ejected Attach the engine shut off cord to a secure place on your cloth ing or your arm or leg while operating Do not attach the cord to clothing that could tear loose Do not route the cor...

Page 50: ...tart and hold it for a maximum of 5 seconds 5 Immediately after the engine starts re lease the main switch and allow it to re turn to on NOTICE Never turn the main switch to start while the engine is running Do not keep the starter motor turning for more than 5 seconds If the starter motor is turned continuously for more than 5 seconds the battery will be quickly discharged thus making it impossib...

Page 51: ...se people and objects in the boat to be thrown forward 1 Place the remote control lever in neutral TIP The start in gear protection device prevents the engine from starting except when in neu tral 2 Attach the engine shut off cord to a se cure place on your clothing or your arm or leg Then install the clip on the other end of the cord into the engine shut off switch 3 Turn the main switch to on 4 ...

Page 52: ...rious damage could occur Stop the engine and check wheth er the cooling water inlet on the lower case or the cooling water pilot hole is blocked Consult your Yamaha dealer if the problem cannot be located and cor rected Check that no water leaks from the joints be tween the exhaust cover cylinder head and body cylinder EMU27670 Warming up engine EMU27704 Electric start and prime start models After...

Page 53: ...ng 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 1 Pull the neutral interlock trigger up if equipped 2 Move the remote control lever gear shift lever firmly and crisply forward for forward gear or backward for reverse gear about 35 a detent can felt for re mote control models To shift from in gear forward rev...

Page 54: ...anism Do not shift into reverse while traveling at planing speeds Loss of control boat swamping or damage to the boat could occur The boat is not equipped with a separate braking system Water resistance stops it af ter the throttle lever is moved back to idle The stopping distance varies depending on gross weight water surface conditions and wind direction EMU27821 Stopping engine Before stopping ...

Page 55: ...ondi tions either trim up or trim down can cause boat instability and can make steering the boat more difficult This in creases 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 Correct trim angle will help im prove perf...

Page 56: ...r trim angle can cause loss of control If equipped with a power trim and tilt switch located on the bottom cowling use the switch only when the boat is at a complete stop with the engine off Do not adjust the trim angle with this switch while the boat is moving Adjust the outboard motor trim angle using the power trim and tilt switch To raise the bow trim out press the switch up To lower the bow t...

Page 57: ...r and there is more air drag Excessive trim out can also cause the propeller to ventilate which reduces per formance further and the boat may por poise hop in the water which could throw the operator and passengers overboard Bow Down Too much trim in causes the boat to plow through the water decreasing fuel economy and making it hard to increase speed Oper ating with excessive trim in at higher sp...

Page 58: ...e tilted for more than a few minutes Otherwise fuel may leak NOTICE ECM00241 Before tilting the outboard motor stop the engine by following the procedure on page 48 Never tilt the outboard mo tor while the engine is running Severe damage from overheating can result Do not tilt up the engine by pushing the tiller handle if equipped because this could break the handle EMU32723 Procedure for tilting ...

Page 59: ... it in the tilt position For more detailed information see page 56 ECM01641 4 Models equipped with trim rods Once the outboard motor is supported with the tilt support lever press the power trim and tilt switch down to retract the trim rods NOTICE Be sure to retract the trim rods completely during mooring This protects the rods from marine growth and corrosion which could damage the power trim and...

Page 60: ...ise severe damage from overheat ing can result EMU32912 Procedure for power trim and tilt models 1 Place the remote control lever gear shift lever in neutral 2 Slightly tilt the outboard motor up to the desired position using the power trim and tilt switch WARNING Using the power trim and tilt switch on the bot tom cowling while the boat is moving or engine is on could increase the risk of falling...

Page 61: ...outside of the outboard motor with fresh wa ter and if possible rinse the power head un der the cowling Cruising in muddy turbid or acidic water Yamaha strongly recommends that you use the optional chromium plated water pump kit see page 16 if you use the outboard motor in acidic water or water with a lot of sediment in it such as muddy or turbid cloudy water After operating in such water flush th...

Page 62: ...ere is insufficient road clearance in this position then trailer the outboard motor in the tilt po sition using a motor support device such as a transom saver bar Consult your Yamaha dealer for further details EMU30272 Storing outboard motor When storing your Yamaha outboard motor for prolonged periods of time 2 months or longer several important procedures must be performed to prevent excessive d...

Page 63: ...dur ing operation Keep hands hair and clothes away from the flywheel and other rotating parts while the engine is running EWM00091 6 Run the engine at a fast idle for 10 15 minutes in neutral position while supply ing fresh water 7 Just prior to turning off the engine quick ly spray Yamaha Stor Rite Engine Fogging Oil alternately into each carbu retor each intake manifold When prop erly done the e...

Page 64: ...supplies If you do not have the proper skills tools or supplies to perform a maintenance procedure have a Yamaha dealer or other qualified mechanic do the work The procedures involve disassembling the motor and exposing dangerous parts To reduce the risk of injury from moving hot or electrical parts Turn off the engine and keep the key s and engine shut off cord lanyard with you when you perform m...

Page 65: ...Operating continuously at or near maxi mum engine speed rpm for many hours Operating continuously at a low engine speed rpm for many hours Brief periods of rapid acceleration and de celeration followed by engine shut off be fore the engine has reached proper operating temperature Frequent quick acceleration and decelera tion Frequent shifting Frequently starting and stopping the en gine s Operatio...

Page 66: ...e 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 Item Actions Initial Every 20 hours 3 months 100 hours 1 year 300 hours 3 years 500 hours 5 years Anode s external Inspection or replace ment as necessary Anode s cylinder head thermostat cover Inspection or replace ment as ...

Page 67: ...t Power trim tilt unit Operation noise and oil leakage Inspection Propeller Propeller nut Cotter pin Inspection or replace ment as necessary PCV Pressure Con trol Valve Inspection or replace ment as necessary Shift link shift cable Inspection adjustment or replacement as nec essary Spark plug s Inspection or replace ment as necessary Spark plug caps high tension cords Inspection or replace ment as...

Page 68: ...nnec tions Wire coupler con nections Inspection or replace ment as necessary Yamaha Meter gauge Inspection Yamaha Fuel tank Inspection and clean ing as necessary Item Actions Every 1000 hours Guide exhaust exhaust manifold Inspection or replace ment as necessary Item Actions Initial Every 20 hours 3 months 100 hours 1 year 300 hours 3 years 500 hours 5 years ...

Page 69: ...or to a Yamaha dealer You should periodically re move and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode If electrode erosion becomes excessive or if carbon and other deposits are excessive you should re place the spark plug with another of the cor rect type 1 Remove the spark plug caps from the spark plugs 2 Remove the spark plug If elect...

Page 70: ...n or replace it For cleaning or replacement of the fuel filter consult your Yamaha dealer EMU29041 Inspecting idling speed WARNING EWM00451 Do not touch or remove electrical parts when starting or during operation Keep hands hair and clothes away from the flywheel and other rotating parts while the engine is running NOTICE ECM00490 This procedure must be performed while the outboard motor is in th...

Page 71: ...maha dealer EMU29112 Checking wiring and connectors Check that each grounding wire is properly secured Check that each connector is engaged se curely EMU32111 Checking propeller WARNING EWM01880 You could be seriously injured if the en gine accidentally starts when you are near the propeller Before inspecting removing or install ing the propeller place the shift control in neutral turn the main sw...

Page 72: ... loosening the propeller nut EWM01890 3 Remove the propeller washer if equipped and thrust washer EMU30671 Installing propeller EMU29233 Spline models NOTICE ECM00500 Be sure to use a new cotter pin and bend the ends over securely Otherwise the propeller could come off during opera tion and be lost 1 Apply Yamaha marine grease or a cor rosion resistant grease to the propeller shaft 2 Install the s...

Page 73: ...ed even when the tilt support lever or knob is locked Severe injury could occur if the outboard motor accidental ly falls 1 Tilt the outboard motor so that the gear oil drain screw is at the lowest point pos sible 2 Place a suitable container under the gear case 3 Remove the gear oil drain screw and gasket NOTICE If there is an exces sive quantity of metal particles on the magnetic gear oil drain ...

Page 74: ...uel tank from the boat be fore cleaning it Work only outdoors in an area with good ventilation Wipe up any spilled fuel immediately Reassemble the fuel tank carefully Im proper assembly can result in a fuel leak which could result in a fire or ex plosion hazard Dispose of old gasoline according to lo cal regulations 1 Empty the fuel tank into an approved container 2 Pour a small amount of suitable...

Page 75: ...lectrolytic fluid is poisonous and caustic and batteries generate ex plosive hydrogen gas When working near the battery Wear protective eye gear and rubber gloves Do not smoke or bring any other source of ignition near the battery Refer to page 14 for detailed safety infor mation about batteries The procedure for checking the battery var ies for different batteries This procedure contains typical ...

Page 76: ... the red battery cable to the POSITIVE terminal first Then con nect the black battery cable to the NEG ATIVE terminal 3 The electrical contacts of the battery and cables must be clean and properly con nected or the battery will not start the engine EMU29371 Disconnecting the battery 1 Turn off the battery cut off switch if equipped and main switch NOTICE If they are left on the electrical system c...

Page 77: ...A Have serviced by a Yamaha dealer Q Is shift lever in gear A Shift to neutral Engine will not start starter operates Q Is fuel tank empty A Fill tank with clean fresh fuel Q Is fuel contaminated or stale A Fill tank with clean fresh fuel Q Is fuel filter clogged A Clean or replace filter Q Is starting procedure incorrect A See page 43 Q Has fuel pump malfunctioned A Have serviced by a Yamaha deal...

Page 78: ...erviced by a Yamaha dealer Q Is air vent screw on fuel tank closed A Open air vent screw Q Is choke knob pulled out A Return to home position Q Is motor angle too high A Return to normal operating position Q Is carburetor clogged A Have serviced by a Yamaha dealer Q Is fuel joint connection incorrect A Connect correctly Q Is throttle valve adjustment incorrect A Have serviced by a Yamaha dealer Q ...

Page 79: ...type A Inspect spark plug s Clean or replace with recommended type Q Are weeds or other foreign matter tangled on gear housing A Remove foreign matter and clean lower unit Q Is fuel system obstructed A Check for pinched or kinked fuel line or other obstructions in fuel system Q Is fuel filter clogged A Clean or replace filter Q Is fuel contaminated or stale A Fill tank with clean fresh fuel Q Is s...

Page 80: ...amaha dealer EMU29433 Temporary action in emergency EMU29440 Impact damage WARNING EWM00870 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 an object in the wa ter follow the procedure below 1 Stop the engine immediately 2 Inspect the control system and all com ponents for da...

Page 81: ...in gear protection device does not oper ate Make sure the remote control lever is in neutral Otherwise the boat could unexpectedly start to move which could result in an accident Attach the engine shut off cord to a se cure 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 entangle...

Page 82: ...n cable from the starter if equipped 3 Remove the starter flywheel cover after removing the bolt s 4 Prepare the engine for starting For fur ther information see page 43 Be sure the engine is in neutral and that the clip is attached to the engine shut off switch The main switch must be on if equipped 5 Insert the knotted end of the emergency starter rope into the notch in the flywheel rotor and wi...

Page 83: ...ping NOTICE ECM00380 Follow this procedure only in an emer gency and just long enough to return to port for repairs EMU29706 Cold engine fails to start If the engine fails to start when it is cold use the following procedure WARNING EWM00410 When starting or operating the engine do not touch the ignition coil spark plug wire spark plug cap or other electrical parts carrying high voltage Keep loose...

Page 84: ...in switch to on 6 Turn the main switch to start NOTICE Never turn the main switch to start while the engine is running Do not keep the starter mo tor turning for more than 5 seconds If the starter motor is turned continu ously for more than 5 seconds the battery will be quickly discharged thus making it impossible to start the engine The starter can also be dam aged If the engine will not start af...

Page 85: ...the starter mechanism malfunctions see page 75 EMU33501 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 NOTICE Do not attempt to run the outboard motor until it has been com pletely inspected ECM00401 ON START ZMU03922 ZMU03145 OPEN CLOSE ...

Page 86: ...80 Consumer information EMU29811 Important warranty information for U S A and Canada ...

Page 87: ...Consumer information 81 ...

Page 88: ...Consumer information 82 EMU29820 YAMAHA MOTOR CORPORATION U S A OUTBOARD MOTOR TWO YEAR LIMITED WARRANTY ...

Page 89: ...Consumer information 83 ...

Page 90: ...Consumer information 84 ...

Page 91: ...Consumer information 85 EMU29841 IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR YAMAHA OUTSIDE THE USA OR CANADA ...

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Page 93: ...6H3 9 1W Hyoshi 08 2 11 9 35 AM ページ 3 ...

Page 94: ...Printed in Japan April 2008 0 3 1 Printed on recycled paper 6H3 9 1W Hyoshi 08 2 11 9 35 AM ページ 4 ...

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Yamaha 70, Owner'S Manual

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