Yamaha F90 Owner'S Manual Download

Page: 1 / 112

Read this manual carefully before operating this

outboard motor.

OWNER’S MANUAL

F90

LIT-18626-11-52

6FP-28199-30-E0

2019 Yamaha Motor Corporation, U.S.A.

Summary of Contents for F90

Page 1: ...Read this manual carefully before operating this outboard motor OWNER S MANUAL F90 LIT 18626 11 52 6FP 28199 30 E0 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 2: ...pour provoquer le cancer des anomalies congénitales et des troubles de la reproduction 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 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 3: ...there may be minor discrepancies between your machine and this manual If there is any question concerning this manual please consult your Yamaha dealer To ensure long product life Yamaha recom mends that you use the product and perform the specified periodic inspections and main tenance by correctly following the instruc tions in the owner s manual Any damage resulting from neglect of these instru...

Page 4: ...er 9 Key number 9 EC Declaration of Conformity DoC 9 CE Marking 9 Compliance mark and manufactured date label 10 Read manuals and labels 12 Warning labels 12 Specifications and requirements 15 Specifications 15 Installation requirements 16 Boat horsepower rating 16 Mounting outboard motor 16 Remote control requirements 16 Battery requirements 17 Battery specifications 17 Propeller selection 17 Sta...

Page 5: ...40 Fuel level alert indicator 40 Low battery voltage alert indicator 41 6Y8 Multifunction meters 41 Engine control system 45 Alert system 45 Overheat alert 45 Low oil pressure alert 45 Water separator alert 46 Installation 48 Installation 48 Mounting the outboard motor 48 Operation 50 First time operation 50 Fill engine oil 50 Breaking in engine 50 Getting to know your boat 50 Checks before starti...

Page 6: ...nance chart 1 77 Maintenance chart 2 80 Greasing 81 Inspecting spark plug 82 Inspecting idle speed 83 Changing engine oil 83 Inspecting wiring and connectors 85 Checking propeller 86 Removing propeller 86 Installing propeller 87 Changing gear oil 88 Inspecting and replacing anode s 89 Checking battery for electric start models 89 Connecting the battery 90 Disconnecting the battery 91 Trouble Recov...

Page 7: ...ocution EMU33661 Power trim and tilt Body parts can be crushed between the 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 people be away from the switches whenever working aro...

Page 8: ...ting fatalities EMU40281 Personal flotation devices PFDs Have an approved PFD on board for every occupant Yamaha recommends that you must wear a PFD whenever boating At a mi nimum children and non swimmers should always wear PFDs and everyone should wear PFDs when there are potentially hazard ous boating conditions EMU33732 People in the water Always watch carefully for people in the wa ter such a...

Page 9: ...oat operators are required by law to file a Boating Accident Report with their boating law enforcement agency if their boat is in volved 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 ...

Page 10: ...ically the same as the International Rules of the Road The rules presented in the following section are con densed and have been provided for your convenience only Contact the U S Coast Guard the National Association of State Boating Law Administra tors or your local Power Squadron for a com plete set of rules governing the waters in which you will be using your boat EMU44740 Boating organizations...

Page 11: ... avoid an immediate collision When you maintain your direction and speed the other vessel will be able to determine how best to avoid you Give way vessel The vessel that does not have the right of way 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...

Page 12: ...l which has the other on the starboard right side must keep out of the way of the other If the other vessel is on your right you must keep out of its way you are the Give Way vessel If the other vessel is on your port left side remember that you should maintain course and direction provid ed the other vessel gives you the right of way as it should Overtaking If you are passing another vessel you a...

Page 13: ... such a channel Reading buoys and other markers The waters of the United States are marked for safe navigation by the lateral system of buoyage Simply put buoys and markers have an arrangement of shapes colors num bers and lights to show which side of the buoy a boater should pass on when navigat ing in a particular direction The markings on these buoys are oriented from the perspec tive of being ...

Page 14: ...Safety information 8 ZMU01708 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 15: ...se you need a new key EMU38981 EC Declaration of Conformity DoC This declaration is included with outboard motors that conform to European regula tions This outboard motor conforms to certain por tions of the European Parliament directive re lating to machinery Each conformed outboard motor accompa nied with EC DoC EC DoC contains the fol lowing information z Name of Engine Manufacture z Model nam...

Page 16: ...t or swivel bracket Regulatory Compliance Mark RCM Engines affixed with this mark conform to certain portion s of the Australian Radio Communications Act ICES 002 Compliance Label Engines affixed with this mark meet all re quirements of the Canadian Interference Causing Equipment Regulations 1 CE marking location 1 ZMU08137 ZMU06040 1 Compliance mark and manufactured date label location 1 Regulato...

Page 17: ... the engines that conform to the regu lations for U S Environmental Protection Agency EPA The models that manufac tured exclusively for the Oceanian countries may not have manufactured date on the la bel 1 Manufactured date ZMU08192 1 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 18: ... any manuals supplied with the boat z Read all labels on the outboard motor and the boat If you need any additional information contact your Yamaha dealer EMU33836 Warning labels If these labels are damaged or missing contact your Yamaha dealer for replacements 1 3 2 ZMU08685 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 19: ...en starting or during operation 2 WARNING EWM01672 z Read Owner s Manuals and labels z Wear an approved personal flotation de vice PFD z Attach engine shut off cord lanyard to your PFD arm or leg so the engine stops if you accidentally leave the helm which could prevent a runaway boat EMU33851 Other labels 6EE G2794 40 6EE H1994 40 1 2 6EE G2794 50 6EE H1994 50 ZMU06191 3 ZMU05710 2 0 1 9 Y a m a ...

Page 20: ...3 Symbols The following symbols mean as follows Notice Warning Read Owner s Manual Hazard caused by continuous rotation Electrical hazard ZMU05696 ZMU05664 ZMU05665 ZMU05666 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 21: ... 1830 cm 111 7 c i Bore stroke 81 0 88 8 mm 3 19 3 50 in Ignition system TCI Spark plug NGK LKR6E 9N Spark plug gap 0 8 0 9 mm 0 031 0 035 in Steering system Remote steering Starting system Electric starter Starting carburetion system Fuel injection Valve clearance IN cold engine 0 15 0 25 mm 0 0059 0 0098 in Valve clearance EX cold engine 0 25 0 35 mm 0 0098 0 0138 in Battery rating CCA SAE 380 1...

Page 22: ...a boat can cause severe in stability Before installing the outboard motor s con firm that the total horsepower of your out board motor s does not exceed the boats maximum horsepower rating See the boat s capacity plate or contact the manufacturer EMU40491 Mounting outboard motor WARNING EWM02501 z Improper mounting of the outboard mo tor could result in hazardous conditions such as poor handling l...

Page 23: ... never ex ceed the maximum CCA rating EMU36293 Mounting battery Mount the battery holder securely in a dry well ventilated vibration free location in the boat WARNING Do not put flammable items or loose heavy or metal objects in the same compartment as the battery Fire explosion or sparks could result EWM01821 Battery cable The battery cable size and length are critical Consult your Yamaha dealer ...

Page 24: ...rage temperatures in the area where the outboard motor will be used If oil grades listed under Recommended en gine oil grade 1 are not available select an al ternative oil grade listed under Recommended engine oil grade 2 Recommended engine oil grade 1 1 Propeller diameter in inches 2 Propeller pitch in inches 3 Type of propeller propeller mark 1 Propeller diameter in inches 2 Propeller pitch in i...

Page 25: ... can cause poor performance or engine dam age Use only fresh gasoline that has been stored in clean containers Gasoline with Ethanol Two types of gasoline are commonly avail able in the U S A Canada Australia and New Zealand for use in automobiles and boats conventional gasoline without Ethanol and gasoline with Ethanol which is typically referred to as E10 gasoline According to fed eral regulatio...

Page 26: ...r com Gasoline Filtration Yamaha outboard motors are equipped with internal fuel filters However excessive water or debris entering your engine s fuel system could prematurely clog the internal filters causing starting and running problems fuel system damage and internal engine dam age Therefore it is recommended that an ex ternal 10 micron water separating fuel filter be installed on your boat an...

Page 27: ... fiberglass and wood may contain materials such as copper graphite and tin that can cause corrosion if applied to aluminum boats and outboard motor components Never apply these types of paint to your out board motor because rapid corrosion damage could occur z Anti fouling paint can increase drag friction between the boat and the wa ter and possibly affect performance If the effects are too great ...

Page 28: ...ticular label EMU40331 One Star Low Emission The one star label identifies engines that meet the Air Resources Board s Personal Watercraft and Outboard marine engine 2001 exhaust emission standards Engines meet ing these standards have 75 lower emis sions than conventional carbureted two stroke engines These engines are equivalent to the U S EPA s 2006 standards for marine engines 1 Approval label...

Page 29: ...marine engine 2008 exhaust emission standards or the Sterndrive and Inboard marine engine 2003 2008 ex haust emission standards Engines meeting these standards have 65 lower emissions than One Star Low Emission engines EMU33862 Four Stars Super Ultra Low Emission The four star label identifies engines that meet the Air Resources Board s Sterndrive and Inboard marine engine 2009 exhaust emission st...

Page 30: ...rom dealer 3 4 5 6 7 11 12 13 1 2 9 10 8 ZMU08688 1 Fuse box 2 Fuel filter 3 Cowling lock lever 4 Power trim and tilt unit 5 Clamp bracket 6 Anode 7 Cooling water inlet 8 Propeller 9 Trim tab anode 10 Anti cavitation plate 11 Flushing device 12 Power trim and tilt switch 13 Top cowling 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 31: ... 8 5 ZMU08689 1 Oil filler cap 2 Cowling lock lever 3 Cooling water pilot hole 4 Drain screw 5 Gear oil drain screw 6 Cooling water inlet 7 Oil level plug 8 Oil dipstick 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 32: ...be used as a fuel storage container Com mercial users should conform to relevant licensing or approval authority regula tions TRIP TIME BATT Km h knot mph km mile SPEED YAMAHA set mode SET MODE SET MODE 4 2 3 5 6 7 8 9 1 10 ZMU08805 1 Remote control box side mount type 2 Remote control box binnacle mount type 3 Switch panel for use with binnacle type 4 Digital tachometer 5 Digital speedometer 6 6Y...

Page 33: ... this product is used outside the country where it was sold it may violate the laws or regulations re garding radio wave transmission in the country it is used in For details consult your Yamaha dealer The Yamaha Security System which pro tects against theft consists of the receiver and remote control transmitters The Yamaha Security System is available from your Yamaha dealer For details consult ...

Page 34: ...utral in terlock trigger up 1 Power trim and tilt switch 2 Remote control lever 3 Neutral interlock trigger 4 Neutral throttle lever 5 Main switch 6 Engine shut off switch 7 Throttle friction adjuster 1 Power trim and tilt switch 2 Remote control lever 3 Free accelerator 4 Throttle friction adjuster 1 2 3 5 4 6 7 ZMU01723 2 1 3 4 ZMU04572 1 Neutral 2 Forward 3 Reverse 4 Shift 5 Fully closed 6 Thro...

Page 35: ...ever TIP z The free accelerator button can only be pushed when the remote control lever is in the neutral position z After the button is pushed the throttle be gins to open after the remote control lever is moved at least 35 z After using the free accelerator return the remote control lever to the neutral position The free accelerator button will return auto matically to its set position The remot...

Page 36: ...est performance and fuel economy for the desired operation EMU25978 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 To decrease resistance turn the adjuster counterclockwise WARNING Do not overtighten the frict...

Page 37: ...e 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 rou te the cord where it could become entan gled preventing it from functioning Avoid accidentally pulling the cord during nor mal operation Loss of engine power means the loss of most steering control Also without engine power the boat could ...

Page 38: ...d the key can not be removed z start With the main switch in the start po sition the starter motor turns to start the en gine When the key is released it returns automatically to the on position EMU26113 Steering friction adjuster A friction device provides adjustable resis tance to the steering mechanism and can be set according to operator preference An ad juster lever is located on the bottom o...

Page 39: ...witch down tilts the outboard motor down and trims it down When the switch is released the outboard motor will stop in its current position For instructions on using the power trim and tilt switch see pages 65 and 67 EMU26156 Power trim and tilt switch on bottom cowling The power trim and tilt switch is located on the side of the bottom cowling Pushing the switch up trims the outboard motor up and...

Page 40: ...1 An improperly adjusted trim tab could cause difficult steering Always test run af ter 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 that the steering control can be turned to either the right or left by applying the same amount of force If the boat tends to veer to t...

Page 41: ...sition use an additional support device to secure it in the tilt position EMU40762 Cowling lock lever The cowling lock levers are used to secure the top cowling EMU40803 Flushing device The flushing device is used to clean the cool ing water passages of the outboard motor using a garden hose and tap water For in structions on using the flushing device see page 75 Bolt tightening torque 42 N m 4 28...

Page 42: ...l filter has been shown to greatly reduce the chance of fuel contamination problems Consult your dealer for information about Yamaha 10 mi cron fuel filters if your boat does not have one EMU26305 Alert indicator If the engine develops a condition which is cause for alert the indicator lights up For de tails on how to read the alert indicator see page 45 1 Flushing device 1 Fuel filter 1 ZMU08081 ...

Page 43: ...on on reading the indicator see page 45 NOTICE ECM00053 Do not continue to run the engine if the overheat alert indicator is on Serious en gine damage will occur EMU41391 Digital tachometer The tachometer shows the engine speed and has the following functions All segments of the display will light momen tarily after the main switch is turned on and will return to normal thereafter EMU36051 Tachome...

Page 44: ...e set and mode buttons for more than 1 second while the trip hours are displayed This resets the trip counter to 0 zero The total number of hours the engine has been run cannot be reset EMU26526 Low oil pressure alert indicator If oil pressure drops too low the alert indica tor will start to blink For further information see page 45 NOTICE ECM00024 z Do not continue to run the engine if the low oi...

Page 45: ...t segments indicate the fuel level When all segments are showing the fuel tank is full The fuel level reading can be inaccurate due to the position of the sensor in the fuel tank and the attitude of the boat in the water Op eration with bow up trim or continuous turn ing can give false readings Do not adjust the selector switch for fuel sen sor Incorrectly setting the selector switch on the gauge ...

Page 46: ... sure the gauge is in the time mode 2 Press the set button the hour dis play will begin blinking 3 Press the mode button until the desired hour is displayed 4 Press the set button again the mi nute display will begin blinking 5 Press the mode button until the desired minute is displayed 6 Press the set button again to start the clock The clock operates on battery power Dis connecting the battery w...

Page 47: ...s z 6Y8 Multifunction tachometer z 6Y8 Multifunction speed fuel meter 6Y8 Multifunction tachometer 6Y8 Multifunction speed fuel meter 1 Fuel level alert segment 1 Low battery indicator TRIP TIME BATT km h knot mph km mile SPEED YAMAHA set mode ZMU07005 1 TRIP TIME BATT km h knot mph km mile SPEED YAMAHA set mode ZMU07006 1 1 Set button 2 Mode button 1 Tachometer 2 Trim meter 3 Multifunction displa...

Page 48: ...separator alert indicator If water has accumulated in the water sepa rator fuel filter while cruising the water sep arator alert indicator will start to blink Stop the engine immediately and see page 95 of this manual to drain the water from the fuel filter Get back to the port soon and con sult a Yamaha dealer immediately 1 Speedometer 2 Fuel meter 3 Multifunction display 1 Yamaha Security System...

Page 49: ...cruising the overheat alert indicator will start to blink and the engine speed will automati cally decrease to about 2000 3500 r min Stop the engine immediately if the buzzer sounds and the overheat device has activat ed Check the cooling water inlet for clog ging NOTICE ECM01594 z Do not continue to run the engine if the overheat alert indicator blinks Serious engine damage will occur z Do not co...

Page 50: ... oil if necessary If the alert device has activated while the appropriate engine oil lev el is maintained consult your Yamaha dealer NOTICE ECM01602 Do not continue to run the engine if the low oil pressure alert device has activated Serious engine damage will occur 1 Low oil pressure alert indicator 1 ZMU08417 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 51: ... de crease to 2000 3500 r min z The overheat alert indicator will light or blink if equipped z 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 z Check trim angle to be sure that the cooling water inlet is submerged z Check the cooling water inlet for clogging EMU2685...

Page 52: ...he alert device does not switch off consult your Yamaha dealer EMU43953 Water separator alert The outboard motor is equipped with a water separator alert system If water separated from the fuel exceeds a specific volume the alert system will activate z The water separator alert indicator will come on or blink z The buzzer will sound intermittently when the remote control lever is in the neutral po...

Page 53: ...he fuel consult a Yamaha dealer NOTICE ECM02341 Although the buzzer will stop when the en gine is started and the remote control le ver is moved to the forward or reverse position do not use the outboard motor Otherwise serious engine damage could occur ZMU01758 ZMU04583 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 54: ...the cen terline keel line of the boat EMU26936 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 water in takes for the cooling system may not get an adequate water supply which can cause en gine overheating If th...

Page 55: ...der transducers can create air borne water spray while the boat is cruising If the outboard motor is oper ated continuously in the presence of air borne water spray enough water could enter the engine through the air intake opening in the top cowling to cause se vere engine damage Remove the cause of the airborne water spray 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 56: ...venly TIP Run the engine in the water under load in gear with a propeller installed as follows For 10 hours for breaking in engine avoid extend ed idling rough water and crowded areas 1 For the first hour of operation Run the engine at varying speeds up to 2000 r min or approximately half throttle 2 For the second hour of operation Increase engine speed as much as nec essary to put the boat on pla...

Page 57: ...ng lock levers and lift up the top cowling EMU36443 Fuel system WARNING EWM00061 Gasoline and its vapors are highly flamma ble and explosive Keep away from sparks cigarettes flames or other sources of ig nition WARNING EWM00911 Leaking fuel can result in fire or explosion z Check for fuel leakage regularly z If any fuel leakage is found the fuel sys tem must be repaired by a qualified me chanic Im...

Page 58: ...roughout the whole range with no binding or excessive free play z Operate the throttle 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 z Look for loose or damaged connections of the throttle and shift cables EMU36484 Engine shut off cord lanyard Inspe...

Page 59: ...ose connector is not properly connected cooling water can leak out and the engine can overheat during operation ECM01802 EMU36965 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 top cowling 3 Place the top cowling on the bottom cowling 4 Check to be sure the rubber seal is seat ed correctly between the top cowling ...

Page 60: ...e no one is near the outboard mo tor before performing this check 1 Check the power trim and tilt unit for any sign of oil leaks 2 Operate each of the power trim and tilt switches to check that all switches work 3 Tilt the outboard motor up and check that the trim and tilt rod is pushed out completely 4 Check that the trim and tilt rod is free of corrosion or other flaws 5 Tilt the outboard motor ...

Page 61: ...yes see your doctor im mediately If gasoline spills on your skin wash with soap and water If gasoline spills on your clothing change your clothes Before refueling check the following points z Ensure the engine is stopped z Securely moor the boat in a well ventilated area and stop the engine If the boat is trailered ensure it is stable z Do not smoke and keep away from sparks flames static electric...

Page 62: ...k with fuel WARNING Do not overfill Otherwise fuel can expand and overflow if the temperature in creases EWM02611 TIP z Wipe up any spilled gasoline immediately with dry rags z Dispose of rags properly according to local laws or regulations 8 Turn the fuel tank cap clockwise to tight en until a click is heard 1 Air vent screw 1 Pressure relief tab 2 Fuel tank cap 1 ZMU07445 1 2 ZMU07446 1 Pressure...

Page 63: ...r vent screw z This product emits exhaust gases which contain carbon monoxide a colorless odorless gas which could cause brain damage or death when inhaled Symp toms include nausea dizziness and drowsiness Keep cockpit and cabin ar eas well ventilated Avoid blocking ex haust outlets EMU43842 Sending fuel portable tank 1 To loosen the air vent screw turn it coun terclockwise until it stops 2 Firmly...

Page 64: ... off cord could result in a runaway boat if operator is ejected Attach the engine shut off cord to a secure place on your clothing or your arm or leg while oper ating 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 z Avoid accidentally pulling the cord dur ing normal operation Loss of engine power means t...

Page 65: ...is cold it needs to be warmed up For further information see page 61 z If the engine is warm and fails to start open the throttle slightly and try to start the en gine again If the engine still fails to start see page 92 EMU27666 Electric start and remote control models WARNING EWM01842 z Failure to attach the engine shut off cord could result in a runaway boat if operator is ejected Attach the en...

Page 66: ...h to on 4 Turn the main switch to start 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 N ZMU01771 N ZMU04588 ZMU01...

Page 67: ...t hole at all times while the engine is running overheating and serious damage could occur Stop the engine and check whether the cooling water inlet on the lower case or the cooling water pilot hole is blocked Consult your Yamaha dealer if the prob lem cannot be located and corrected EMU27671 Warming up engine EMU41234 Procedure for warming up engine 1 After starting the engine warm up the engine ...

Page 68: ...gine is warm the idle speed may be higher than normal High idle speed can prevent you from shifting back to neutral If this occurs stop the en gine shift to neutral then restart the en gine 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 for ward gear or backward for ...

Page 69: ... crisply into the neutral position EMU31743 Stopping boat WARNING EWM01511 z Do not use the reverse function to slow down or stop the boat as it could cause you to lose control be ejected or im pact the steering wheel or other parts of the boat This could increase the risk of serious injury It could also damage the shift mechanism R F ZMU05462 N ZMU01771 N ZMU04588 2 0 1 9 Y a m a h a M o t o r C ...

Page 70: ...ch To increase the trolling speed press the switch To decrease the trolling speed press the switch TIP z The trolling speed changes approximately 50 r min each time a switch is pressed z If the trolling speed has been adjusted the engine returns to the normal trolling speed when the engine is stopped and restarted or when the engine speed exceeds ap proximately 3000 r min EMU27822 Stopping engine ...

Page 71: ...ity and can make steering the boat more difficult This increases the possibility of an accident If the boat be gins 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 performance and fuel economy while reducing strain on the engine C...

Page 72: ... 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 trim in press the switch down Make test runs with the trim set to different angles to find the position that works best for your boat and operating conditions EMU27913 Adjusting boat trim When the boat is on plane a bow up attitude results in less drag gr...

Page 73: ...a tion difficult and dangerous TIP Depending on the type of boat the outboard motor trim angle may have little effect on the trim of the boat when operating EMU27936 Tilting up and down If the engine will be stopped for some time or if the boat is moored in shallows the out board motor should be tilted up to protect the propeller and lower casing from damage by collision with obstructions and also...

Page 74: ...ine by pushing the tiller handle if equipped because this could break the handle EMU44631 Procedure for tilting up power trim and tilt models 1 Place the remote control lever gear shift lever in neutral 2 Press the power trim and tilt switch up until the outboard motor has tilted up completely N ZMU01771 N ZMU04588 1 Power trim and tilt switch 1 Power trim and tilt switch ZMU07848 UP 1 2 0 1 9 Y a...

Page 75: ...he motor cannot be trailered in the normal running posi tion use an additional support device to secure it in the tilt position For more detailed information see page 72 ECM01642 EMU42702 Procedure for tilting down 1 Push the power trim and tilt switch up until the outboard motor is support ed by the tilt rod and the tilt support lever becomes free 2 Release the tilt support lever 3 Push the power...

Page 76: ...lower unit is above the surface of the water when set ting up for and cruising in shallow water Otherwise severe damage from overheat ing can result EMU32914 Procedure for power trim and tilt models 1 Place the remote control lever gear shift lever in neutral 1 Power trim and tilt switch 1 Power trim and tilt switch 1 DN ZMU08694 1 Cooling water inlet 1 ZMU08144 N ZMU01771 N ZMU04588 2 0 1 9 Y a m...

Page 77: ...EMU28196 Cruising in other conditions Cruising in salt water After operating in salt water flush the cooling water passages with fresh water to prevent them from becoming clogged Also rinse the outside of the outboard motor with fresh wa ter Cruising in muddy turbid or acidic water Yamaha strongly recommends that you use the optional chromium plated water pump kit see page 21 if you use the outboa...

Page 78: ... tilted for a pro longed time for mooring or trailering the boat make sure to follow the procedure listed be low z Disconnect the fuel hose from the fuel joint on the outboard motor z Tighten the fuel tank cap and its air vent screw The outboard motor should be transported and stored in the normal running position If there is insufficient road clearance in this po sition then trailer the outboard ...

Page 79: ...g pre ventative measures that may work best for the gasoline and environmental conditions in your area EMU28306 Procedure EMU44313 Flushing with the flushing attachment Cooling system flushing is essential to pre vent the cooling system from clogging up with salt sand or dirt In addition fogging lu bricating of the engine is mandatory to pre vent excessive engine damage due to rust Perform the flu...

Page 80: ...sively and almost stall 7 Turn off the water supply and then re move the flushing attachment and wipe off any excess water 8 Install the top cowling and propeller 9 Drain the cooling water completely out of the outboard motor Clean the exterior of the outboard motor thoroughly EMU41072 Lubrication 1 Change the gear oil For instructions see page 88 Check the gear oil for the pres ence of water that...

Page 81: ...gh the cooling water passages for about 15 minutes 4 Turn off the water supply and then dis connect the garden hose from the gar den hose connector 5 Connect the garden hose connector to the fitting on the bottom cowling and tighten it securely NOTICE If the gar den hose connector is not properly connected cooling water can leak out and the engine can overheat during operation ECM01802 TIP When fl...

Page 82: ...Be sure no one is in this area before operating the power trim and tilt mechanism z Allow the engine to cool before handling hot parts or fluids z Always completely reassemble the mo tor before operation Maintenance replacement or repair of the emission control devices and systems may be performed by any marine engine repair establishment or individual All war ranty repairs however including those...

Page 83: ...d be adjusted when operating the engine under adverse conditions such as extended trolling z Disassembly or repairs may be necessary depending on the outcome of maintenance checks z Expendable or consumable parts and lubricants will lose their effectiveness over time and through normal usage regardless of the warranty period z When operating in salt water muddy other turbid cloudy acidic water the...

Page 84: ... pump Inspection or re placement as nec essary Fuel engine oil leakage Inspection Gear oil Replacement 88 Greasing points Greasing 81 Clamp bracket bolt through tube Inspection and greasing Impeller water pump housing Inspection or re placement as nec essary Impeller water pump housing Replacement Power trim and tilt unit Inspection 54 Propeller propeller nut cotter pin Inspection or re placement ...

Page 85: ...t tle cable Inspection adjust ment or replace ment as necessary Thermostat Inspection or re placement as nec essary Timing belt Inspection or re placement as nec essary Valve clearance Inspection and ad justment Cooling water inlet Inspection 24 Main switch stop switch Inspection or re placement as nec essary Wire harness con nections wire cou pler connections Inspection or re placement as nec ess...

Page 86: ...MU46080 Maintenance chart 2 Item Actions Every Page 1000 hours Exhaust guide ex haust manifold Inspection or re placement as nec essary Timing belt Replacement 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 87: ...Maintenance 81 EMU41302 Greasing Yamalube Marine Grease ZMU08711 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 88: ...ark plug cap from the spark plug 3 Remove the spark plug WARNING When removing or installing a spark plug be careful not to damage the in sulator A damaged insulator could al low external sparks which could lead to explosion or fire EWM00562 To check the spark plug 1 Check the condition of the spark plug If electrode erosion becomes excessive or carbon and other deposits are exces sive replace the...

Page 89: ...to warm up fully in neutral until it is running smoothly 2 Once the engine has warmed up verify whether the idle speed is set to specifi cation For idle speed specifications see page 15 If you have difficulty verifying the idle speed or the idle speed requires adjustment consult a Yamaha dealer or other qualified mechanic EMU38807 Changing engine oil WARNING EWM00761 z Avoid draining the engine oi...

Page 90: ...TIP If the oil does not drain easily change the tilt angle or turn the outboard motor to port and starboard to drain the oil 7 Put a new gasket on the oil drain screw Apply a light coat of oil to the gasket and install the drain screw TIP If a torque wrench is not available when you are installing the drain screw finger tighten the screw just until the gasket comes into contact with the surface of...

Page 91: ...ks NOTICE If the low oil pressure alert indicator comes on or if there are oil leaks stop the engine and find the cause Continued operation with a problem could cause severe engine damage Consult your Yamaha dealer if the problem cannot be located and corrected ECM01623 14 Install the top cowling 15 Dispose of used oil according to local regulations TIP z For more information on the disposal of us...

Page 92: ...anti cavi tation plate and the propeller to prevent the propeller from turning Checkpoints z Check each of the propeller blades for ero sion from cavitation or ventilation or other damage z Check the propeller shaft for damage z Check the splines for wear or damage z Check for fish line tangled around the pro peller shaft z Check the propeller shaft oil seal for dam age EMU30663 Removing propeller...

Page 93: ...82 3 Install the spacer if equipped and the washer Tighten the propeller nut to the specified torque 4 Align the propeller nut with the propeller shaft hole Insert a new cotter pin in the hole and bend the cotter pin ends NOTICE Do not reuse the cotter pin Otherwise the propeller can come off during operation ECM01892 TIP If the propeller nut does not align with the propeller shaft hole after tigh...

Page 94: ...ndicate lower unit problem Con sult your Yamaha dealer ECM01901 TIP Always use new gaskets Do not reuse the re moved gaskets 4 Remove the oil level plug and gasket to allow the oil to drain completely NOTICE Check the used gear oil after it has been drained If the gear oil is milky or contains water or a large amount of metal particles the gear case may be damaged Have a Yamaha dealer check and re...

Page 95: ...y sacrificial anodes Inspect the external anodes periodically Remove scales from the surfaces of the anodes Consult a Yamaha dealer for replacement of external anodes NOTICE ECM00721 Do not paint anodes as this would render them ineffective TIP Inspect ground leads attached to external an odes on equipped models Consult a Yamaha dealer for inspection and replace ment of internal anodes attached to...

Page 96: ...ctions They should be clean secure and covered by an insulating cover WARNING Bad connections can produce shorting or arcing and cause an explosion EWM01913 EMU29335 Connecting the battery WARNING EWM00573 Mount the battery holder securely in a dry well ventilated vibration free location in the boat Install a fully charged battery in the holder NOTICE ECM01125 Do not reverse the battery cables Oth...

Page 97: ...sconnect the negative cable s from the negative terminal NOTICE Al ways disconnect all negative cables first to avoid a short circuit and dam age to the electrical system ECM01941 3 Disconnect the positive cable s and re move the battery from the boat 4 Clean maintain and store the battery according to the manufacturer s instruc tions 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

Page 98: ...aler 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 58 Q Has fuel pump malfunctioned A Have serviced by a Yamaha dealer Q Are spark plug s fouled o...

Page 99: ... 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 Is battery c...

Page 100: ...rrect ty pe 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...

Page 101: ...ivot loose or damaged A Tighten or have serviced by a Yamaha dealer EMU29434 Temporary action in emergen cy EMU29442 Impact damage WARNING EWM00871 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...

Page 102: ...tor can be tilted manually 1 Stop the engine 2 Loosen the manual valve screw by turn ing it counterclockwise until it stops 3 Tilt the outboard motor up manually to the desired position and then tighten the manual valve screw by turning it clock wise EMU47040 Water separator alert is activated af ter leaving port WARNING EWM01501 Gasoline is highly flammable and its va pors are flammable and explo...

Page 103: ...If the water separator alert indicator blinks or the buzzer sounds intermittently perform the following procedure TIP The buzzer sounds only when the remote control lever is placed in neutral 1 Stop the engine 2 Remove the top cowling 3 Remove the water detection switch lead from the holder 4 Disconnect the water detection switch coupler NOTICE Be careful not to get any water on the water detectio...

Page 104: ...er 12 Install the top cowling 13 Turn the main switch to the on po sition and check that the water separa tor alert indicator remains off and the buzzer does not sound If the water sep arator alert indicator blinks or the buzzer sounds have your Yamaha dealer check the outboard motor NOTICE Although the buzzer will stop when the engine is started and the remote control lever is moved to the forwar...

Page 105: ...Yamaha Outboard Motor Dealer for assistance The local dealer will contact Yamaha on the owner s behalf so that needed repairs can be made as quickly as possible CUSTOMER S RESPONSIBILITY Under the terms of this warranty the customer will be responsible for ensuring that the outboard motor is properly operated maintained and stored as specified in the applicable Owner s Manual The owner of the outb...

Page 106: ...ansfer THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE PROVINCE TO PROVINCE YAMAHA MAKES NO OTHER WARRANTY OF ANY KIND EXPRESSED OR IMPLIED ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH EXCEED THE OBLIGATIONS AND TIME LIMITS STATED IN THIS WARRANTY ARE HEREBY DISCLAIMED BY YAMAHA AND EXCLUDED FRO...

Page 107: ...your country of residence If you are temporarily using a U S registered outboard motor in Canada or a Canada registered outboard motor in the United States and it needs warranty repairs you should contact a nearby authorized Yamaha Outboard Motor Dealer for assistance The local dealer will contact Yamaha on the owner s behalf so that needed repairs can be made as quickly as possible 2 If you need ...

Page 108: ...ctured date label 10 Components diagram 24 Control functions checking 52 Cooling water 61 Cowling installing 53 Cowling lock lever 35 Cruising in salt water or other conditions 71 D Digital speedometer 39 Digital tachometer 37 E EC Declaration of Conformity DoC 9 Electric shock 1 Emergency equipment 21 Emergency temporary action in 95 Emission control information 22 Engine oil 52 Engine oil changi...

Page 109: ...rd motor checking 53 Outboard motor disposal requirements 21 Outboard motor painted surface checking 76 Outboard motor safety 1 Outboard motor serial number 9 Overheat alert 45 Overheat alert indicator 37 38 Overloading 2 P Passenger training 4 Passengers 2 People in the water 2 Periodic maintenance 76 Personal flotation devices PFDs 2 Power trim and tilt 1 Power trim and tilt switch bottom cowlin...

Page 110: ...ator 30 Tiller handle 29 Tilt support lever 35 Tilting up and down 67 Top cowling removing 51 Transporting and storing outboard motor 72 Trim meter 38 Trim tab with anode 34 Trimming outboard motor 65 Trip meter 40 Trolling 64 Troubleshooting 92 V Variable trolling RPM switches 34 Voltmeter 40 W Warming up engine 61 Warning labels 12 Warranty information use outside the U S A or Canada 101 Warrant...

Page 111: ...ories will fit right and perform right right out of the box Yamalube Take care of your Yamaha with legendary Yamalube oils lubricants and care products They re formulated and approved by the toughest judges we know the Yamaha engineering teams that know your Yamaha from the inside out Genuine Yamaha Service Manuals Get the same factory manual for your vehicle that the technicians at your authorize...

Page 112: ...Printed on recycled paper Printed in Japan November 2016 1 8 2 CR 2 0 1 9 Y a m a h a M o t o r C o r p o r a t i o n U S A ...

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Yamaha F90, Owner'S Manual

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