Yamaha F-20 Owner'S Manual Download Page 1

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F15C
F20

OWNER’S MANUAL

6AG-28199-13

U.S.A.Edition

LIT-18626-08-05

Read this manual carefully before operating this

outboard motor.

6AG-9-13 Hyoshi 08.2.6 10:28 AM ページ 1

2019 Yamaha Motor Corporation, U.S.A.

Summary of Contents for F-20

Page 1: ...R S MANUAL 6AG 28199 13 U S A Edition LIT 18626 08 05 q Read this manual carefully before operating this outboard motor 6AG 9 13 Hyoshi 08 2 6 10 28 AM ページ 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 2: ...ore 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 6AG 9 13 Hyoshi 08 2 6 10 28 AM ページ 2 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: ...ates 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 print ing there may be minor discrepancies between your mac...

Page 4: ...5 Boat horsepower rating 15 Mounting motor 15 Remote control requirements 16 Battery requirements 16 Specifications of Battery 16 Mounting battery 16 Multiple batteries 17 Without a rectifier or Rectifier Regulator 17 Propeller selection 17 Start in gear protection 17 Engine oil requirements 18 Fuel requirements 18 Gasoline 18 Ring Free Fuel Additive 19 Muddy or acidic water 19 Anti fouling paint ...

Page 5: ...e tank 44 Starting engine 45 Checks after starting engine 49 Cooling water 49 Warming up engine 49 Manual start and electric start models 49 Checks after engine warm up 49 Shifting 49 Stop switches 49 Shifting 49 Stopping boat 51 Stopping engine 51 Procedure 51 Trimming outboard motor 52 Adjusting trim angle for manual tilt models 53 Adjusting trim angle power tilt models 53 Adjusting boat trim 54...

Page 6: ...s 79 Connecting the battery 80 Disconnecting the battery 80 Trouble Recovery 82 Troubleshooting 82 Temporary action in emergency 85 Impact damage 85 Replacing fuse 85 Power tilt will not operate 86 Starter will not operate 86 Emergency starting engine manual starter model 87 Emergency starting engine electric start model 88 Treatment of submerged motor 90 Consumer information 91 Important warranty...

Page 7: ...t 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 tilt mecha nism The power tilt switches operate even when the main switch is off Keep people be away from the switches whenever working around the motor Never get under the lower unit while it is tilt ed even when the tilt support lever or knob is locked Sev...

Page 8: ...ommends 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 near the boat shift into neut...

Page 9: ...at 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 education and training Operators sho...

Page 10: ...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 boatus com National Associati...

Page 11: ...a 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 There are three main situations...

Page 12: ...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 waters with your boat you will...

Page 13: ...re 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 with dis tinctive shapes and c...

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: ...pare 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 serial number location 1 Outboard motor serial number locat...

Page 16: ...anuals 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 ZMU06169 1 2 3 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 17: ...General information 11 1 2 3 ZMU05670 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: ...ng 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 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: ...in F15CMH 1078 mm 42 4 in F20EH 1078 mm 42 4 in F20ER 1078 mm 42 4 in F20MH 1078 mm 42 4 in Overall height L F15CEH 1205 mm 47 4 in F15CMH 1205 mm 47 4 in F15CPH 1205 mm 47 4 in F20EH 1205 mm 47 4 in F20ER 1205 mm 47 4 in F20MH 1204 mm 47 4 in F20PH 1205 mm 47 4 in F20PR 1205 mm 47 4 in Transom height S F15CEH 438 mm 17 2 in F15CMH 438 mm 17 2 in F20EH 438 mm 17 2 in F20ER 438 mm 17 2 in F20MH 438...

Page 20: ... 9 Spark plug gap 0 8 0 9 mm 0 031 0 035 in Control system F15CEH Tiller F15CMH Tiller F15CPH Tiller F20EH Tiller F20ER Remote control F20MH Tiller F20PH Tiller F20PR Remote control Starting system F15CEH Electric F15CMH Manual F15CPH Electric F20EH Electric F20ER Electric F20MH Manual F20PH Electric F20PR Electric Starting carburetion system Prime start Valve clearance cold engine IN 0 15 0 25 mm...

Page 21: ...0 220 Imp qt Tightening torque for engine Spark plug 18 0 Nm 1 84 kgf m 13 3 ft lb Propeller nut 17 0 Nm 1 73 kgf m 12 5 ft lb Engine oil drain bolt 28 0 Nm 2 86 kgf m 20 7 ft lb Engine oil filter 18 0 Nm 1 84 kgf m 13 3 ft lb EMU33553 Installation requirements EMU33563 Boat horsepower rating WARNING EWM01560 Overpowering a boat can cause severe instability Before installing the outboard motor s c...

Page 22: ...attery voltage is too low NOTICE ECM01061 Do not use a battery that does not meet the specified capacity If a battery that does not meet specifications is used the electric system could perform poorly or be overloaded causing electric system damage EMU36290 Mounting battery Mount the battery holder securely in a dry well ventilated vibration free location in the boat WARNING Do not put flammable i...

Page 23: ...d manufactures propel lers for every Yamaha outboard motor and every application Your outboard motor came with a Yamaha propeller chosen to perform well over a range of applications but there may be uses where a different propeller would be more appropriate Your Yamaha dealer can help you select the right propeller for your boating needs Select a propeller that will allow the engine to reach the m...

Page 24: ...85 is a fuel containing 85 ethanol and must not be used in your outboard motor All ethanol blends containing more than 10 ethanol can cause fuel system damage or cause en gine starting and running problems Yamaha does not recommend gasohol containing methanol because it can cause fuel system damage or engine performance problems It is recommended that you install a water separating marine fuel fil...

Page 25: ...ha strongly recommends that you have your dealer install the optional chromium plated water pump kit if you use the outboard motor in muddy or acidic water conditions However depending on the model it might not be required EMU36330 Anti fouling paint A clean hull improves boat performance The boat bottom should be kept as clean of ma rine growth as possible If necessary the boat bottom can be coat...

Page 26: ...label is attached to the clamp bracket or the swivel bracket EMU25273 Star labels Your outboard motor is labeled with a Cali fornia Air Resources Board CARB star la bel See below for a description of your particular label 1 Approval label location ZMU05516 1 ZMU05159 1 Manufactured date label location 1 Star labels location ZMU05498 1 Manufactured ZMU04346 ZMU05623 1 2 0 1 9 Y a m a h a M o t o r ...

Page 27: ...er emissions than One Star Low Emission engines EMU25300 Three Stars Ultra Low Emission The three star label identifies engines that meet the Air Resources Board s 2008 ex haust emission standards Engines meeting these standards have 65 lower emissions than One Star Low Emission engines EMU33861 Four Stars Super Ultra Low Emission The four star label identifies engines that meet the Air Resources ...

Page 28: ...6 7 8 9 11 12 13 14 21 15 16 17 18 19 10 20 8 13 14 16 17 18 22 1 Top cowling 2 Tilt lock lever 3 Drain screw 4 Anti cavitation plate 5 Trim tab 6 Propeller 7 Cooling water inlet 8 Alert indicator s 9 Gear shift lever 10 Engine stop button Engine shut off switch 11 Throttle friction adjuster 12 Throttle grip 13 Power tilt switch 14 Transom clamp handle 15 Steering friction lever 16 Rope attachment...

Page 29: ...box The remote control lever actuates both 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 le...

Page 30: ...ver 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 away from you puts the engine in re...

Page 31: ... 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 control lever or throttle grip which could resul...

Page 32: ...ff 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 engine power the boat could slow rapidly Thi...

Page 33: ... and the key can be removed on With the main switch in the on posi tion the electrical circuits are on and the key cannot be removed 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 EMU26102 Power tilt switch The power tilt system adjusts the outboard motor angle in relation to the tr...

Page 34: ...e A To decrease resistance turn the lever to the starboard side B 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 If the resistance does not increase even when the lever is turned to the port side A make sure that the nut is tightened to the specified torque TIP Steering movement is blocked w...

Page 35: ...ccident EMU26253 Trim tab 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 that the steering control can be turned to either the right or left by applying the same amount...

Page 36: ... knob under the swivel bracket NOTICE ECM00660 Do not use the tilt support lever or knob when trailering the boat The outboard motor could shake loose from the tilt sup port and fall If the motor cannot be trail ered in the normal running position use an additional support device to secure it in the tilt position EMU26332 Tilt support bar The tilt support bar keeps the outboard motor in the tilted...

Page 37: ...tilt unit could be damaged as a result NOTICE ECM00660 Do not use the tilt support lever or knob when trailering the boat The outboard motor could shake loose from the tilt sup port and fall If the motor cannot be trail ered in the normal running position use an additional support device to secure it in the tilt position EMU26382 Top cowling lock lever pull up type To remove the engine top cowling...

Page 38: ...d tap water TIP For details on usage see page 65 EMU26303 Alert indicator If the engine develops a condition which is cause for alert the indicator lights up For details on how to read the alert indicator see page 34 1 Flushing device 1 Alert indicator ZMU05597 1 ZMU05530 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 39: ...ill occur The low oil pressure alert indicator does not indicate the engine oil level Use the oil dipstick to check the re maining oil quantity For further infor mation see page 41 EMU36032 Overheat alert indicator If the engine temperature rises too high this indicator will light up For further information on reading the indicator see page 34 NOTICE ECM00052 Do not continue to run the engine if t...

Page 40: ...quipped 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 EMU3016A Low oil pressure alert If the oil pressure drops too low the alert de vice will activate The engine speed will automatical...

Page 41: ...ted stop the en gine as soon as it is safe to do so Check the oil level and add oil as needed If the oil level is correct and the alert device does not switch off consult your Yamaha dealer ZMU02360 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 42: ...rer Improper mounting of the outboard mo tor could result in hazardous condi tions such as poor handling loss of control or fire hazards For permanent ly mounted models your dealer or oth er person experienced in proper rigging should mount the motor EMU32011 Mounting the outboard motor 1 Be sure to mount the outboard motor while the boat is on land If the boat is on the water move it to an area o...

Page 43: ...CE ECM01630 During water testing check the buoy ancy of the boat at rest with its maxi mum load Check that the static water level on the exhaust housing is low enough to prevent water entry into the power head when water rises due to waves when the outboard is not run ning Incorrect engine height or obstructions to the smooth flow of water such as the design or condition of the boat or ac cessorie...

Page 44: ... securely Occa sionally check the screws for tight ness during operation EWM00641 2 If the engine restraint cable attachment is equipped on your engine an engine restraint cable or chain should be used Attach one end to the engine restraint cable attachment and the other to a se cure mounting point on the boat Other wise the engine could be completely lost if it accidentally falls off the transom ...

Page 45: ...rocedure could result in reduced engine life or even severe engine damage Run the engine in the water under load in gear with a propel ler installed as follows For ten hours for breaking in engine avoid extended 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 I...

Page 46: ...fuel system must be repaired by a qualified mechanic Improper repairs can make the outboard unsafe to operate EMU36450 Check for fuel leaks Check under top cowling and in the boat for fuel leaks or gasoline fumes Check fuel line connections to be sure they are tight Check fuel lines for cracks swelling or other damage EMU37320 Check the fuel filter Check that the fuel filter is clean and free of w...

Page 47: ...s breaks and wear EMU27165 Engine oil 1 Put the outboard motor in an upright po sition not tilted NOTICE If the motor is not level the oil level indicated on the dipstick may not be accurate ECM01790 2 Remove the top cowling 3 Remove oil dipstick and wipe it clean 4 Insert the dipstick and remove it again Be sure to completely insert the dipstick into the dipstick guide otherwise the oil level mea...

Page 48: ... 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 engine 5 Move the lever to lock the cowling as shown NOTICE If the cowling is not installed correctly water spray under the cowling can damage the engine or the cowling can blow off at high speeds ECM01990 After installi...

Page 49: ...nections are clean secure and covered by insulating covers The electrical contacts of the battery and cables must be clean and properly connected or the battery will not start the engine Refer to the battery manufacturer s instruc tions for checks for your particular battery EMU27436 Filling fuel WARNING EWM01830 Gasoline and its vapors are highly flam mable and explosive Always refuel ac cording ...

Page 50: ... sure there are no swimmers in the water near you When the air vent screw is loosened gasoline vapor will be released Gaso line is highly flammable and its vapors are flammable and explosive Refrain from smoking and keep away from open flames and sparks while loosen ing the air vent screw This product emits exhaust gases which contain carbon monoxide a col orless odorless gas which could cause bra...

Page 51: ... 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 entangled pre venting 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 engine power the boat could slow rapidly This could cause people and objects in the bo...

Page 52: ...e fully closed position EMU27604 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 cord where it could become entangled pre ve...

Page 53: ...r 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 impossi ble to start the engine The starter can also be damaged If the engine will not start after 5 seconds of cranking release the starter button wait 10 seconds then crank the engine again ECM00161 TIP When the engine is cold it needs ...

Page 54: ...he 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 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 wh...

Page 55: ...nd body cylinder EMU27670 Warming up engine EMU27715 Manual start and electric start models 1 After starting the engine allow it to idle for 3 minutes to warm up Failure to do so will shorten engine life 2 Be sure the low oil pressure alert indica tor goes off after starting the engine NOTICE If the low oil pressure alert indicator blinks after the engine starts stop the engine Otherwise se rious ...

Page 56: ... 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 Be sure to check that the tilt lock lever is in the lock down position if equipped before operating in reverse TIP Tiller handle models The gear shift lever op erates only when the throttle grip is in the ful ly closed positi...

Page 57: ...raveling 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 the engine first let it cool off for a ...

Page 58: ...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 performance and fuel economy while red...

Page 59: ...ty or control problems Improper trim angle can cause loss of control TIP The outboard motor trim angle can be changed approximately 4 degrees by shifting the trim rod one hole EMU27904 Adjusting trim angle power tilt models WARNING EWM00753 Be sure all people are clear of the out board motor when adjusting the trim angle Body parts can be crushed be tween the motor and the clamp bracket when the m...

Page 60: ...h the bow up the boat may have a greater tenden cy to steer to one side or the other Compen sate for this as you steer The trim tab can also be adjusted to help offset this effect When the bow of the boat is down it is easier to accelerate from a standing start onto plane Bow Up Too much trim out puts the bow of the boat too high in the water Performance and econ omy are decreased because the hull...

Page 61: ...uce salt corrosion WARNING EWM00221 Be sure all people are clear of the out board motor when tilting up and down Body parts can be crushed between the motor and the clamp bracket when the motor is trimmed or tilted WARNING EWM00250 Leaking fuel is a fire hazard If there is a fuel joint on the outboard motor discon nect the fuel line or close the fuel cock if the engine will be tilted for more than...

Page 62: ...b when trailering the boat The outboard motor could shake loose from the tilt support and fall If the motor cannot be trailered in the nor mal running position use an addi tional support device to secure it in the tilt position For more detailed in formation see page 62 ECM01641 EMU32723 Procedure for tilting up power tilt models 1 Place the remote control lever gear shift lever in neutral 2 Press...

Page 63: ...annot be trailered in the nor mal running position use an addi tional support device to secure it in the tilt position For more detailed in formation see page 62 ECM01641 4 Models equipped with trim rods Once the outboard motor is supported with the tilt support lever press the power tilt switch down to retract the trim rods NOTICE Be sure to retract the trim rods completely during mooring This pr...

Page 64: ... supported by the tilt rod and the tilt support knob becomes free 2 Pull out the tilt support knob 3 Push the power tilt switch down to lower the outboard motor to the desired position EMU28061 Shallow water EMU28073 Cruising in shallow water manual tilt models WARNING EWM01781 Run the boat at the lowest possible ZMU05541 ZMU05528 ZMU02825 DN ZMU01936 UP DN ZMU05581 DN DN ZMU04901 2 0 1 9 Y a m a ...

Page 65: ...so that the cooling water inlet on the 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 EMU28125 Procedure 1 Place the remote control lever gear shift lever in neutral 2 Place the tilt lock lever in the release up position 3 Slightly tilt the outboard motor up The tilt support bar will lock automati...

Page 66: ... 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 EMU32942 Procedure for power 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 tilt switch WARNING Using the power tilt switch on the bottom cowling while ...

Page 67: ...ith 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 19 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 the cool ing passages with fresh ...

Page 68: ...ort 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 The outboard motor should be trailered and stored in the normal running position If there 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 Consul...

Page 69: ...performed to prevent excessive damage It is advisable to have your outboard motor serviced by an authorized Yamaha dealer prior to storage However you the owner with a minimum of tools can perform the fol lowing procedures NOTICE ECM01080 To prevent problems which can be caused by oil entering the cylinder from the sump keep the outboard motor in the attitude shown when transporting and storing it...

Page 70: ...ha dealer or other qualified mechanic if the fuel system is to be drained instead 4 Disconnect the fuel line from the out board motor 5 Remove the engine top cowling and si lencer cover Remove the propeller For further details see page 76 6 Position the outboard motor on a water tank For further details see page 36 7 Fill the tank with fresh water to above the level of the anti cavitation plate NO...

Page 71: ...ur Yamaha dealer for information about fogging oil and procedures for your engine EMU28423 Cleaning and anticorrosion measures 1 Wash down the exterior of the outboard motor with fresh water and dry off com pletely NOTICE Do not spray water into the air intake ECM01840 2 Spray the outboard motor exterior with Yamaha Silicone Protectant 3 Wax the cowling with a non abrasive wax such as Yamaha Silic...

Page 72: ... page 62 EMU28460 Checking painted surface of motor Check the motor for scratches nicks or flak ing paint Areas with damaged paint are more likely to corrode If necessary clean and paint the areas A touch up paint is avail able from your Yamaha dealer EMU37012 Periodic maintenance WARNING EWM01942 These procedures require mechanical skills tools and supplies If you do not have the proper skills to...

Page 73: ...enuine parts and ac cessories are available from your Yamaha dealer EMU35520 Maintenance interval guidelines The service intervals provided in the Mainte nance Chart were developed based upon typical use that includes operating at varied speeds with sufficient time for engine warm up and cool down a medium to light load and an average cruising speed near the 3000 to 4000 rpm range As with any engi...

Page 74: ...ed 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 necessa...

Page 75: ...nspection Propeller Propeller nut Cotter pin 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 necessary Water from the cooling water pilot hole Inspection Throttle link Throttle cable Throttle pick up timing Inspectio...

Page 76: ...replace ment as necessary Wire harness connec tions Wire coupler con nections Inspection or replace ment as necessary Yamaha Fuel tank Inspection and clean ing as necessary Item Actions Every 1000 hours Guide exhaust exhaust manifold Inspection or replace ment as necessary Timing belt Replacement Item Actions Initial Every 20 hours 3 months 100 hours 1 year 300 hours 3 years 500 hours 5 years 2 0 ...

Page 77: ...Maintenance 71 EMU28932 Greasing Yamaha marine grease Water resistant grease F15CEH F15CMH F15CPH F20EH F20MH F20PH ZMU05557 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 78: ...tion problem in that cylinder Do not attempt to diagnose any problems yourself Instead take the outboard motor 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 ano...

Page 79: ...ark plug a good estimate of the correct torque is 1 4 to 1 2 a turn past fin ger tight Have the spark plug adjusted to the correct torque as soon as possible with a torque wrench EMU37450 Checking fuel filter Check the fuel filter periodically If any water or foreign matter is found in the filter clean or replace it For cleaning or replacement of the fuel filter consult your Yamaha dealer EMU29041...

Page 80: ... but not hot WARNING EWM01950 Be sure the outboard motor is securely fastened to the transom or a stable stand NOTICE ECM01710 Change the engine oil after the first 20 hours of operation or 3 months and ev ery 100 hours or at 1 year intervals there after Otherwise the engine will wear quickly 1 Put the outboard motor in an upright po sition not tilted NOTICE If the motor is not level the oil level...

Page 81: ...roblem could cause severe engine damage Consult your Yamaha dealer if the problem cannot be located and cor rected ECM00682 6 Turn off the engine and wait 3 minutes Recheck the oil level using the dipstick to be sure the level falls between the up per and lower marks Fill with oil if it is below the lower mark or drain to the specified level if it is above the upper mark 7 Dispose of used oil acco...

Page 82: ...plate and the propeller to prevent the propeller from turning Checkpoints Check each of the propeller blades for wear erosion from cavitation or ventila tion or other damage Check the propeller shaft for damage Check the splines for wear or damage Check for fish line tangled around the pro peller shaft Check the propeller shaft oil seal for dam age EMU30661 Removing propeller EMU29197 Spline model...

Page 83: ... propeller can come off during operation ECM01890 TIP If the propeller nut does not align with the propeller shaft hole after tightening to the specified torque tighten the nut further to align it with the hole EMU29287 Changing gear oil WARNING EWM00800 Be sure the outboard motor is securely fastened to the transom or a stable stand You could be severely injured if the outboard motor falls on you...

Page 84: ... out of the oil level plug hole insert and tighten the oil level plug 7 Put a new gasket on the gear oil drain screw Insert and tighten the gear oil drain screw EMU29302 Cleaning fuel tank WARNING EWM00920 Gasoline is highly flammable and its va pors are flammable and explosive If you have any question about properly doing this procedure consult your Yamaha dealer Keep away from sparks cigarettes ...

Page 85: ...ing and replacing anode s Yamaha outboard motors are protected from corrosion by 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 ECM00720 Do not paint anodes as this would render them ineffective TIP Inspect ground leads attached to external anodes on equipped models Consult ...

Page 86: ... an explosion EWM01910 EMU29333 Connecting the battery WARNING EWM00570 Mount the battery holder securely in a dry well ventilated vibration free loca tion in the boat Install a fully charged bat tery in the holder NOTICE ECM01123 Reversal of the battery cables will dam age the electrical parts 1 Make sure the main switch on applica ble models is off before working on the battery 2 Connect the red...

Page 87: ... damage to the electrical system ECM01940 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 88: ...ealer 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 45 Q Has fuel pump malfunctioned A Have serviced by a Yamaha dealer Q Are spark plug s fouled ...

Page 89: ...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 cable disconnected...

Page 90: ...lean 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 spark plug gap incorrect A Ins...

Page 91: ...act 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 damage Also inspect the boat for damage 3 Whether damage is found ...

Page 92: ...s procedure only in an emergen cy to return to the nearest port for re pairs When the emergency starter rope is used to start the engine the start 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 you...

Page 93: ...ne is running Do not install the starter mechanism or top cowling after the engine is running Do not touch the ignition coil spark plug wire spark plug cap or other elec trical components when starting or op erating the motor You could get an electrical shock EMU31993 Emergency starting engine manual starter model 1 Remove the top cowling 2 Remove the dust cover 3 Disconnect the start in gear prot...

Page 94: ... 4 or 5 tries open the throttle a small amount between 1 8 and 1 4 and try again Also if the engine is warm and fails to start open the throttle a same amount and try to start the engine again If the engine still fails to start see page 45 Slowly return the throttle grip to the fully closed position so that the engine does not stall EMU32003 Emergency starting engine electric start model 1 Remove ...

Page 95: ...s and fix the plate 7 Prepare the engine for starting For fur ther information see page 45 Be sure that the gear shift is in neutral and that the clip is attached to the engine shut off switch The main switch must be on if equipped ZMU05613 ZMU05624 ZMU05614 ZMU05615 ZMU05616 ZMU02026 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 96: ...ies open the throttle a small amount between 1 8 and 1 4 and try again Also if the engine is warm and fails to start open the throttle a same amount and try to start the engine again If the engine still fails to start see page 45 Slowly return the throttle grip to the fully closed position so that the engine does not stall EMU33501 Treatment of submerged motor If the outboard motor is submerged im...

Page 97: ...91 Consumer information EMU29811 Important warranty information for U S A and Canada 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: ...Consumer information 92 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 99: ...Consumer information 93 EMU29830 YAMAHA MOTOR CORPORATION U S A FOUR STROKE OUTBOARD MOTOR THREE YEAR LIMITED WARRANTY 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 100: ...Consumer information 94 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 101: ...Consumer information 95 EMU29841 IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR YAMAHA OUTSIDE THE USA OR CANADA 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 102: ... 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 103: ...6AG 9 13 Hyoshi 08 2 6 10 28 AM ページ 3 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 104: ...Printed in Japan April 2008 2 0 1 Printed on recycled paper 6AG 9 13 Hyoshi 08 2 6 10 28 AM ページ 4 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 F-20, Owner'S Manual

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