Yamaha F25G Owner'S Manual Download Page 39

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Engine control system

EMU26806

Alert system

ECM00093

Do not continue to operate the engine if
an alert device has activated. Consult
your Yamaha dealer if the problem cannot
be located and corrected.

EMU43754

Overheat alert

This engine has an overheat-alert device. If
the engine temperature rises too high, the
alert device will activate.



The engine speed will automatically de-
crease to 2000–3500 r/min.



The overheat-alert indicator will light or
blink (if equipped).



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.

EMU26869

Low oil pressure alert

If the oil pressure drops too low, the alert de-
vice will activate.



The engine speed will automatically de-
crease to about 2000–3500 r/min.

ZMU0

ZMU01758

ZMU08744

6FM-28199-75-1E0.book 33 ページ２０１９年１０月３０日　水曜日　午前１１時２３分

Summary of Contents for F25G

Page 1: ...Read this manual carefully before operating this outboard motor OWNER S MANUAL F25G 6FM 28199 75 E0 6FM 28199 75 1E0 book 1 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 2: ...ual 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 6FM 28199 75 1E0 book 1 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 3: ...ies between your machine and this manual If there is any question concerning this manu al 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 instructions is not covered by war...

Page 4: ...nting outboard motor 13 Remote control requirements 14 Battery requirements 14 Battery specifications 14 To install the battery 14 Propeller selection 14 Start in gear protection 15 Engine oil requirements 15 Fuel requirements 16 Gasoline 16 Muddy or acidic water 17 Anti fouling paint 17 Outboard motor disposal requirements 17 Emergency equipment 17 Components 18 Components diagram 18 Fuel tank 20...

Page 5: ... Sending fuel portable tank 45 Starting engine 46 Checks after starting engine 51 Cooling water 51 Warming up engine 51 Manual start and electric start models 51 Checks after engine warm up 52 Shifting 52 Stop switches 52 Shifting 52 Stopping boat 54 Trolling 54 Adjusting trolling speed 54 Stopping engine 54 Procedure 55 Trimming outboard motor 56 Adjusting trim angle for manual tilt models 56 Adj...

Page 6: ...ing wiring and connectors 83 Checking propeller 84 Removing propeller 84 Installing propeller 85 Changing gear oil 85 Inspecting and replacing anode s 87 Checking battery for electric start models 87 Connecting the battery 88 Disconnecting the battery 88 Trouble Recovery 89 Troubleshooting 89 Temporary action in emergency 92 Impact damage 92 Replacing fuse 92 Power trim and tilt will not operate 9...

Page 7: ...rocution EMU33662 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 peo ple away from the switches whenever work ing aro...

Page 8: ...ng EMU33711 Alcohol and drugs Never operate after drinking alcohol or taking drugs Intoxication is one of the most com mon factors contributing to boating 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 minimum children and non swimmers should always wear PFDs and everyone should w...

Page 9: ...on to avoid collisions Re member boats do not have brakes and stopping the engine or reducing throttle can reduce the ability to steer If you are not sure that you can stop in time before hitting an obstacle apply throttle and turn in another direction EMU48100 Collisions with floating or submerged objects If the outboard motor hits a floating object or an obstacle in the water while cruising the ...

Page 10: ... emergency EMU33891 Boating safety publications Be informed about boating safety Additional publications and information can be obtained from many boating organizations EMU33602 Laws and regulations Know the marine laws and regulations where you will be boating and obey them Several sets of rules prevail according to geographic location but all are basically the same as the International Rules of ...

Page 11: ...ion Re cord this number in the space provided for reference in case you need a new key EMU38983 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 relating to machinery Each conformed outboard motor accompa nied with EC DoC EC DoC contains the...

Page 12: ...to European regulations Outboard motors affixed with this CE mark ing conform with the directives of 2006 42 EC 94 25 EC 2003 44 EC 2014 30 EU and 2004 108 EC 2013 53 EU 1 CE marking location 1 CE marking location 1 ZMU08714 1 ZMU08715 ZMU06040 6FM 28199 75 1E0 book 6 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 13: ...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 EMU33836 Warning labels If these labels are damaged or missing contact your Yamaha dealer for replacements F25GE F25GET 3 1 2 ZMU08815 6FM 28199 75 1E0 book 7 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 14: ...General information 8 F25GMH F25GWH 3 1 2 ZMU08717 6FM 28199 75 1E0 book 8 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 15: ...hile the engine is running Do not touch or remove electrical parts when starting or during operation 3 EWM01672 Read Owner s Manuals and labels Wear an approved personal flotation device PFD 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 ZMU05746 1 2 3 6EE G2794 40 6EE G2794 50 6EE H1994 40 6EE H1...

Page 16: ...rol lever gear shift lever operat ing direction dual direction Engine start Engine cranking EMU48000 Engine data recording This model s ECM stores certain engine data to assist in the diagnosis of malfunctions and for research statistical analysis and devel opment purposes ZMU05696 ZMU05664 ZMU05665 ZMU05666 ZMU05667 ZMU05668 6FM 28199 75 1E0 book 10 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 17: ... this data to a third party except in the following cases In addi tion Yamaha may provide engine data to a contractor in order to outsource services re lated to the handling of the engine data Even in this case Yamaha will require the contractor to properly handle the engine data we provided and Yamaha will appropriately manage the data With the consent of the boat owner Where obligated by law For...

Page 18: ...b F25GWH 64 kg 141 lb F25GET Performance Full throttle operating range 5000 6000 r min Rated power 18 4 kW 25 HP Idle speed in neutral 850 950 r min Power unit Type 4 stroke SOHC L2 4 valves Total displacement 432 cm3 26 4 c i Bore stroke 65 0 65 1 mm 2 56 2 56 in Ignition system TCI Spark plug NGK DPR6EB 9 Spark plug gap 0 8 0 9 mm 0 031 0 035 in Steering system Remote steering F25GE F25GET Tille...

Page 19: ...Noise and vibration level Operator sound pressure level ICOMIA 39 94 83 0 dB A Vibration on tiller handle ICOMIA 38 94 4 7 m s2 EMU33556 Installation requirements EMU33566 Boat horsepower rating EWM01561 Overpowering a boat can cause severe instability Before installing the outboard motor s con firm that the total horsepower of your out board motor s does not exceed the boat s maximum horsepower r...

Page 20: ...and length EMU44771 To install the battery ECM01091 A battery cannot be connected to models that do not have a rectifier or Rectifier Regulator If you wish to use a battery your outboard motor must be equipped with the following parts Rectifier or Rectifier Regulator Lighting coil If you do not know if your outboard motor is equipped with these parts consult your Yamaha dealer Install an optional ...

Page 21: ...within the recommended engine speed range when carrying lighter loads To check the propeller see page 84 EMU25771 Start in gear protection Yamaha outboard motors or Yamaha ap proved remote control units are equipped with start in gear protection device s This feature permits the engine to be started only when it is in neutral Always select neutral before starting the engine EMU41953 Engine oil req...

Page 22: ...in clean containers TIP This mark identifies the recommended fuel for this outboard motor as specified by Eu ropean regulation EN228 Check that gasoline nozzle has the same identifier when fueling Recommended engine oil YAMALUBE 4 or 4 stroke outboard motor oil Recommended engine oil grade 1 SAE 10W 30 10W 40 5W 30 API SG SH SJ SL Recommended engine oil grade 2 SAE 15W 40 20W 40 20W 50 API SH SJ S...

Page 23: ...c water Yamaha 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 EMU36331 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...

Page 24: ... all mod els order from dealer F25GMH F25GWH F25GE 9 1 2 8 10 11 4 3 5 6 7 ZMU08783 1 Top cowling 2 Clamp bracket 3 Oil level plug 4 Anti cavitation plate 5 Cooling water inlet 6 Gear oil drain screw 7 Propeller 8 Trim tab 9 Drain screw 10 Idle hole 11 Cowling lock lever 6FM 28199 75 1E0 book 18 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 25: ...cowling 2 Clamp bracket 3 Oil level plug 4 Anti cavitation plate 5 Cooling water inlet 6 Gear oil drain screw 7 Propeller 8 Trim tab 9 Drain screw 10 Power trim and tilt switch 11 Idle hole 12 Cowling lock lever 6FM 28199 75 1E0 book 19 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 26: ...y regula tions 16 15 14 13 12 11 10 9 8 2 1 4 3 7 6 5 18 17 1 Top cowling 2 Manual starter handle 3 Starter button 4 Alert indicator 5 Engine shut off cord lanyard 6 Engine stop button 7 Throttle friction adjuster 8 Gear shift lever 9 Throttle grip 10 Variable trolling RPM switch 11 Clamp screw 12 Tilt lock lever 13 Restraint cable attachment 14 Steering friction adjuster 15 Tilt support knob 16 F...

Page 27: ...itch es are mounted on the remote control box EMU26191 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 engine will begin to accelerate 1 Fuel joint 2 Fue...

Page 28: ...erate 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 EMU25914 Tiller handle To change direction move the tiller handle to the left or right as necessary EMU25925 Gear shift lever Move the gear shift lever forward to engage the forward gear or rearward to engage the reverse gear 6 Throttle 7 Fully...

Page 29: ...sumption curve on the throttle indicator shows the relative amount of fuel consumed for each throttle position Choose the setting that offers the best performance and fuel economy for the desired operation 1 Forward 2 Neutral 3 Reverse 1 Forward 2 Neutral 3 Reverse ZMU08722 R F 1 2 3 N 2 2 1 3 2 1 3 1 Throttle indicator ZMU08723 ZMU08724 6FM 00 1 6FM 28199 75 1E0 book 23 ページ２０１９年１０月３０日水曜日午前１１時２...

Page 30: ...ntain the desired throttle set ting EMU25996 Engine shut off cord lanyard and clip The clip must be attached to the engine shut off switch for the engine to run The cord should be attached to a secure place on the operator s clothing or arm or leg Should the operator fall overboard or leave the helm the cord will pull out the clip stopping ignition to the engine This will prevent the boat from run...

Page 31: ... the boat to be thrown forward EWM00123 EMU26004 Engine stop button The engine stop button stops the engine when the button is pushed 1 Engine shut off cord lanyard 2 Clip 3 Engine shut off switch 1 Engine shut off cord lanyard 2 Clip 3 Engine shut off switch ZMU01716 1 2 3 ZMU08726 2 1 3 1 Engine shut off cord lanyard 2 Clip 3 Engine shut off switch 1 1 1 2 2 3 3 ZMU08727 6FM 28199 75 1E0 book 25...

Page 32: ...in 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 EMU47160 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 of the til ler handle bracket To increase resista...

Page 33: ...motor angle in relation to the tran som Pushing the switch up trims the outboard motor up and then tilts it up Push ing the switch 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 56 and 58 EMU26156 Power trim and tilt switch on bottom cowling The ...

Page 34: ...he 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 For instructions on using the variable troll ing RPM switches see page 54 EMU26246 Trim tab with anode EWM00841 An improperly adjusted trim tab could cause difficult steering Always test run after the trim tab has be...

Page 35: ...the outboard motor from lifting out of the wa ter when in reverse gear To release the lock pull up the tilt lock lever in the release position EMU26323 Tilt support knob To keep the outboard motor in the tilted up position push the tilt support knob under the swivel bracket ECM00661 Do not use the tilt support lever or knob when trailering the boat The outboard motor could shake loose from the til...

Page 36: ... from the tilt support and fall If the motor cannot be trailered in the normal running position use an addi tional support device to secure it in the tilt position EMU39264 Cowling lock lever The cowling lock lever s is used to secure the top cowling EMU26464 Flushing device This device is used to clean the cooling wa ter passages of the motor using a garden hose and tap water TIP For details on u...

Page 37: ... 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 33 1 Alert indicator 1 Alert indicator 1 ZMU08740 1 6FM 28199 75 1E0 book 31 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 38: ...ndicate the engine oil level Use the oil dipstick to check the oil lev el For further information see page 41 EMU36034 Overheat alert indicator If the engine temperature rises too high this indicator will light up For further information on reading the indicator see page 33 ECM00053 Do not continue to run the engine if the overheat alert indicator is on Serious en gine damage will occur 1 Low oil ...

Page 39: ...The overheat alert indicator will light or blink if equipped 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 EMU26869 Low oil pressure alert If the oil p...

Page 40: ...ipped The buzzer will sound if equipped If the alert system has activated 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 consult your Yamaha dealer ZMU08745 ZMU02360 6FM 28199 75 1E0 book 34 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 41: ...andling 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 EMU47170 Mounting the outboard motor ECM01681 Do not hold the top cowling when mount ing or dismounting the outboard motor The top cowling could come off causing the outboard motor to fall 1 Be sure to mount the outboard motor while the boat is o...

Page 42: ...eight of the outboard motor greatly affects the water resistance If the mounting height is too high cavitation tends to occur thus reducing the propulsion and if the propeller tips cut the air the engine speed will rise abnormally and cause the en gine to overheat If the mounting height is too low the water resistance will increase and thereby reduce engine efficiency Mount the outboard motor so t...

Page 43: ...rim angle of the outboard motor see page 56 EMU26974 Clamping the outboard motor 1 Place the outboard motor on the tran som so that it is positioned as close to the center as possible Tighten the tran som clamp screws evenly and securely Occasionally check the clamp screws for tightness during operation of the out board motor because they could be come loose due to engine vibration WARNING Loose c...

Page 44: ...aging If used they must be of at least the same quality of material and strength and must be tightened se curely After tightening test run the engine and check their tightness EWM00652 1 Bolts ZMU02637 1 6FM 28199 75 1E0 book 38 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 45: ...10 hours break in to allow mating surfaces of moving parts to wear in evenly 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 ex tended idling rough water and crowded ar eas 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 oper...

Page 46: ...ift off the top cowling EMU36443 Fuel system EWM00061 Gasoline and its vapors are highly flam mable and explosive Keep away from sparks cigarettes flames or other sourc es of ignition EWM00911 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 uns...

Page 47: ...throughout the whole range with no binding or excessive free play 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 Look for loose or damaged connections of the throttle and shift cables EMU36484 Engine shut off cord lanyard Inspect...

Page 48: ...steners Check the propeller for damage Check for engine oil leaks EMU36494 Flushing device Check that the flushing device s garden hose connector is securely screwed on to the fit ting on the bottom cowling NOTICE If the garden hose connector is not properly connected cooling water can leak out and the engine can overheat during oper ation ECM01802 EMU36956 Install top cowling 1 Be sure that the c...

Page 49: ...entally falls Body parts can be crushed between the motor and the clamp bracket when the motor is trimmed or tilted Be sure no one is near the outboard motor 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 i...

Page 50: ...your skin wash with soap and wa ter If gasoline spills on your clothing change your clothes 1 Be sure the engine is stopped 2 Disconnect the fuel line from the fuel tank and tighten the air vent screw on the fuel tank cap 3 Remove the portable tank from the boat 4 Be sure you are in a well ventilated out door area either securely moored or trailered 5 Do not smoke and keep away from sparks flames ...

Page 51: ...hich 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 EMU2746B Sending fuel portable tank 1 If there is an air vent screw on the fuel tank cap loosen it 2 or 3 turns 2 If there is a fuel joint on the motor align the fuel...

Page 52: ...le 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 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 boat to be thrown forward...

Page 53: ...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 Avoid accidentally pulling the cord dur ing normal operation Loss of engine power means the loss of most steering control Also witho...

Page 54: ...en the engine is cold it needs to be warmed up For further information see page 51 If the engine is warm and fails to start open the throttle slightly and try to start the engine again If the engine still fails to start see page 89 EMU27606 Electric start prime start models EWM01842 Failure to attach the engine shut off cord could result in a runaway boat if operator is ejected Attach the engine s...

Page 55: ...he starter button and allow it to re turn to its original position NOTICE Never push the starter button 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 impossi ble to start the engine The starter can also be damaged If the engine will n...

Page 56: ...w rapidly This could cause 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 ...

Page 57: ...If water is not flowing out of the pilot hole at all times while the engine is running overheating and serious 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 EMU27671 Warming up engine EMU27718 Manual start and electric start models ...

Page 58: ...les in the water near you ECM01611 Warm up the engine before shifting into gear Until the engine 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 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 co...

Page 59: ...in gear forward reverse to neutral 1 Close the throttle so that the engine slows to idle speed 2 After the engine is at idle speed in gear move the remote control lever gear shift lever firmly and crisply into the neu tral position ZMU08763 R F N R F ZMU05462 ZMU08758 6FM 00 START N ZMU01771 6FM 28199 75 1E0 book 53 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 60: ...ection EMU30881 Trolling EMU30891 Adjusting trolling speed The trolling speed on outboard motors equipped with the variable trolling RPM switches can be adjusted approximately 50 r min with each press of a switch To increase the trolling speed press the switch To decrease the trolling speed press the switch TIP The trolling speed changes approximately 50 r min each time a switch is pressed If the ...

Page 61: ...f there is a fuel joint on the outboard motor 3 Tighten the air vent screw on the fuel tank cap if equipped 4 Remove the key if the boat will be left un attended TIP The engine can also be stopped by pulling the cord and removing the clip from the en gine shut off switch then turning the main ZMU08727 ON OFF ZMU01779 ZMU08817 ZMU02301 6FM 28199 75 1E0 book 55 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 62: ...rim is also affected by variables such as the load in the boat sea conditions and running speed EMU38881 Adjusting trim angle for manual tilt models EWM00401 Stop the engine before adjusting the trim angle Use care to avoid being pinched when removing or installing the rod Use caution when trying a trim position for the first time Increase speed gradu ally and watch for any signs of instabil ity o...

Page 63: ...when trying a trim position for the first time Increase speed gradu ally and watch for any signs of instabil ity or control problems Improper 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 movin...

Page 64: ...ause 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 speeds also makes the boat unstable Resistance at the bow is...

Page 65: ...ore tilting the outboard motor stop the engine by following the procedure on page 54 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 EMU47190 Procedure for tilting up manual tilt models 1 Place the remote control lever gear shift lever in neutr...

Page 66: ...fall If the motor cannot be trailered in the normal run ning position use an additional sup port device to secure it in the tilt position For more detailed informa tion see page 66 ECM01642 EMU44590 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 complet...

Page 67: ...ob when trailering the boat The outboard motor could shake loose from the tilt support and fall If the motor cannot be trailered in the normal running position use an additional support device to secure it in the tilt position For more detailed information see page 66 ECM01642 EMU30193 Procedure for tilting down manual tilt models 1 Place the tilt lock lever in the lock posi tion 2 Slightly tilt t...

Page 68: ...em The tilt lock mecha nism does not work while the shallow water cruising system is being used Hitting an underwater obstacle could cause the outboard motor to lift out of the water resulting in loss of control Use extra care when operating in re verse Too much reverse thrust can cause the outboard motor to lift out of the water increasing the chance of ac cident and personal injury ECM00261 Do n...

Page 69: ...r tially raised position This outboard mo tor has 2 positions for shallow water cruising 4 To return the outboard motor to the nor mal running position place the remote control lever gear shift lever in neutral 5 Place the tilt lock lever in the lock down position then slightly tilt the outboard motor up until the tilt support bar auto matically returns to the free position N ZMU03087 ZMU08756 N Z...

Page 70: ...can result EMU32914 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 overboard and could distract the op...

Page 71: ...de 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 17 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 water to prevent cor rosion Al...

Page 72: ...e deteriorated fuel could clog the fuel line causing engine start dif ficulty or malfunction When storing or transporting the outboard motor make sure to follow the procedure list ed below Disconnect the fuel line from the outboard motor Tighten the fuel tank cap and its air vent screw When the outboard motor is tilted pro longed time for mooring or trailering the boat disconnect the fuel line fro...

Page 73: ...h the tiller handle 5 Loosen the clamp screw s 6 Hold the handgrip as shown in the illus tration and lift up the outboard motor to dismount it from the boat 7 When transporting or storing the out board motor while removed from a boat keep the outboard motor in the attitude shown or use an outboard motor stand ZMU08787 A 1 Handgrip ZMU08788 1 1 1 1 ZMU08789 6FM 28199 75 1E0 book 67 ページ２０１９年１０月３０日 ...

Page 74: ...ECM01081 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 If storing or transporting the outboard motor on its side not up right put it on a cushion after draining the engine oil Do not place the outboard motor on its side before the cooling water has drained from it completely otherwis...

Page 75: ...engine at a fast idle for a few minutes in neutral position WARNING Do not touch or remove electrical parts when starting or during opera tion Keep hands hair and clothes away from the flywheel and other ro tating parts while the engine is run ning EWM00092 6 Just prior to turning off the engine quick ly spray Fogging Oil on to the silencer cover When properly done the engine will almost stall TIP...

Page 76: ...ge from overheating can result 1 After shutting off the engine unscrew the garden hose connector from the fit ting on the bottom cowling 2 Screw the garden hose adapter onto a garden hose which is connected to a fresh water supply and then connect it to the garden hose connector 3 With the engine off turn on the water tap and let the water flush through the cool ing passages for about 15 minutes T...

Page 77: ...ha dealer EMU2847G Periodic maintenance EWM01872 These procedures require mechanical skills tools and 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 par...

Page 78: ...ine speed rpm for many hours Operating without sufficient time for engine to warm up and cool down Frequent quick acceleration and decelera tion Frequent shifting Frequently starting and stopping the en gine s Operation that fluctuates often between light and heavy cargo loads Outboard motors operating under any of these above conditions require more fre quent maintenance Yamaha recommends that yo...

Page 79: ...the engine should be 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 Page 20 hours 3 months 100 hours 1 year 300 hours 3 years 500 hours 5 years Anode s external Inspection or replacement as necessary 87 Anode s internal 1 Inspection or replacemen...

Page 80: ...acket bolt through tube Inspection and greasing Impeller water pump housing Inspection or replacement as necessary Impeller water pump housing Replacement Power trim and tilt unit Inspection 43 Propeller propeller nut cotter pin Inspection or replacement as necessary 84 Shift link shift cable Inspection adjust ment or replace ment as necessary Spark plug s Inspection or replacement as necessary 77...

Page 81: ...tment Cooling water inlet Inspection 18 Main switch stop switch Inspection or replacement as necessary Wire harness con nections wire cou pler connections Inspection or replacement as necessary Yamaha Meter gauge Inspection Fuel tank Yamaha portable tank Inspection and cleaning as neces sary Item Actions Every Page 1000 hours Exhaust guide exhaust manifold Inspection or replacement as necessary Ti...

Page 82: ...enance 76 EMU28945 Greasing Yamaha grease A water resistant grease Yamaha grease D corrosion resistant grease for propeller shaft F25GMH F25GWH ZMU08779 6FM 28199 75 1E0 book 76 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 83: ...rode porcelain is very white this could indicate an intake air leak or carburetion problem in that cylinder Do not attempt to diagnose any problems yourself 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 1 Disconnect the clamps securing the spark plug ca...

Page 84: ... or fire EWM00562 4 Be sure to use the specified spark plug otherwise the engine may not operate properly Before fitting the spark plug measure the electrode gap with a wire thickness gauge replace it if out of spec ification 5 When fitting the plug wipe off any dirt from the threads and then screw it in to the correct torque 1 Clamp 1 Spark plug cap 1 1 1 ZMU08803 1 ZMU08802 1 Spark plug Standard...

Page 85: ... be used If the boat is not equipped with a tachometer for the outboard motor use a diagnostic ta chometer for this procedure Results may vary depending on whether testing is con ducted with the flushing attachment in a test tank or with the outboard motor in the water 1 Start the engine and allow it to warm up fully in neutral until it is running smooth ly 2 Once the engine has warmed up verify w...

Page 86: ...out board motor is not level the oil level indicated on the oil dipstick may not be accurate ECM01862 2 Start the engine Warm it up and keep the idle speed for 5 10 minutes 3 Stop the engine and leave it for 5 10 minutes 4 Remove the top cowling 5 Remove the oil filler cap Pull out the dip stick and use the oil changer to extract the oil completely TIP When using an oil changer skip steps 6 and 7 ...

Page 87: ...dipstick NOTICE Overfilling the oil could cause leakage or damage If the oil level is above the upper level mark drain until the level meets the specified capacity ECM01851 9 Leave the outboard motor for 5 10 min utes 10 Remove the oil dipstick and wipe it clean 11 Insert the dipstick and remove it again Be sure to completely insert the dipstick into the dipstick guide otherwise the oil level meas...

Page 88: ...acing the engine oil filter EWM00761 Avoid draining the engine oil immedi ately after stopping the engine The oil is hot and should be handled with care to avoid burns Be sure the outboard motor is securely fastened to the transom or a stable stand Yamaha recommends you to have a Yamaha dealer replace the engine oil filter If you perform replacement yourself follow the procedure below If you have ...

Page 89: ... will use Yamalube oils take full advantage of the base oil s qualities and blend in the ideal bal ance of additives to make sure the final oil clears our performance standards Thus Ya malube mineral semisynthetic and synthetic oils have their own distinct characters and value Yamaha s experience gained over many years of research and development into oil since the 1960 s helps make Yama lube the ...

Page 90: ...he propeller from turning Checkpoints Check each of the propeller blades for ero sion from cavitation or ventilation 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 EMU30663 Removing propeller EMU29198 Spline models 1 Straighten the cotter pin and pull it...

Page 91: ...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 slot does not align with the propeller shaft hole after tightening the pro peller nut to the specified torque tighten the nut further to align the slot with the hole EMU47070 Changing gear oil EWM00801 Be sure the outboard motor is securely fastene...

Page 92: ... used oil consult your Yamaha dealer 5 Put the outboard motor in a vertical posi tion Using a flexible or pressurized fill ing device inject the gear oil into the gear oil drain screw hole 6 Put a new gasket on the oil level plug When the oil begins to flow out of the oil level plug hole insert and tighten the oil level plug TIP Apply a light coat of gear oil to the oil level plug thread and gaske...

Page 93: ...nd batteries generate explosive 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 The procedure for checking the battery var ies for different batteries This procedure contains typical checks that apply to many batteries but you should always refer to the battery manufacturer s instructions ECM0...

Page 94: ... 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 EMU29372 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 can be damaged ECM01931 2 Disconnect the negative cable s from ...

Page 95: ...r components malfunction ing Have serviced by a Yamaha dealer Trouble Engine will not start starter operates Item Question Answer Engine shut off cord lanyard Is clip on engine shut off cord lan yard installed Install clip to engine shut off switch Fuel tank Is fuel tank empty Fill tank with clean fresh fuel Fuel Is fuel contaminated or stale Fill tank with clean fresh fuel Fuel filter Is fuel fil...

Page 96: ... Yamaha dealer Fuel tank Is fuel tank air vent restricted or clogged Remove obstruction Fuel joint Is fuel joint connection incorrect Connect correctly Air vent screw Is air vent screw on fuel tank closed Open air vent screw Battery Is battery cable disconnected Connect securely Outboard motor mounting Is motor angle too high Return to normal operating position Throttle valve Is throttle valve adj...

Page 97: ...material and clean lower unit Fuel system Is fuel system clogged Inspect for pinched or kinked fuel line or other obstructions in fuel system Fuel filter Is fuel filter clogged Clean or replace fuel filter Fuel Is fuel contaminated or stale Fill tank with clean fresh fuel Is specified fuel not being used Replace fuel with specified type Ignition wiring Is ignition wiring damaged or poorly connecte...

Page 98: ...fuse or a piece of wire could allow excessive current flow This could cause electric system damage and a fire hazard Consult your Yamaha dealer if the new fuse immediately blows again Have motor adjusted to proper transom height Is trim angle incorrect Adjust trim angle to achieve most effi cient operation Is motor mounted at incorrect height on transom Have motor adjusted to proper tran som heigh...

Page 99: ... gency starter rope EWM01023 Use this 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 s...

Page 100: ...heel or other moving parts when the engine 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 EMU47121 Emergency starting engine manual start model 1 Disconnect the start in gear protection cabl...

Page 101: ...en 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 46 Slowly return the throttle grip to the fully closed position so that the engine does not stall EMU47130 Emergency starting engine electric start model 1 Remove the flywheel mag...

Page 102: ...nd the flywheel magnet clockwise 4 Pull the rope slowly until resistance is felt Give a strong pull straight out to crank and start the engine If the engine does not start on the first try repeat the procedure TIP If the engine does not start on the first try ZMU08757 N ZMU01771 ZMU01772 ZMU08800 6FM 28199 75 1E0 book 96 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 103: ...gain If the engine still fails to start see page 46 Slowly return the throttle grip to the fully closed position so that the engine does not stall EMU33502 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 inspect...

Page 104: ...ng the outboard motor 66 E EC Declaration of Conformity DoC 5 Electric shock 1 Emergency equipment 17 Emergency starting engine electric start model 95 Emergency starting engine manual start model 94 Emergency temporary action in 92 Engine checking 42 Engine data recording 10 Engine oil 41 Engine oil changing 79 Engine oil filling 39 Engine oil requirements 15 Engine shut off cord lanyard 1 41 Eng...

Page 105: ...tation devices PFDs 2 Power trim and tilt 1 Power trim and tilt switch bottom cowling 27 Power trim and tilt switch remote control 27 Power trim and tilt system checking 43 Power trim and tilt will not operate 93 Propeller 1 Propeller checking 84 Propeller installing 85 Propeller removing 84 Propeller selection 14 R Read manuals and labels 7 Remote control box 21 Remote control lever 21 Remote con...

Page 106: ...he battery 14 Top cowling installing 42 Top cowling removing 40 Transporting and storing outboard motor 66 Trimming outboard motor 56 Trim rod tilt pin 29 Trim tab with anode 28 Trolling 54 Troubleshooting 89 V Variable trolling RPM switches 28 W Warming up engine 51 Warning labels 7 Weather 4 Wiring and connectors inspecting 83 Y Yamalube 83 6FM 28199 75 1E0 book 100 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 107: ...6FM 28199 75 1E0 book 101 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

Page 108: ...Printed in Japan November 2019 0 4 1 6FM 28199 75 1E0 book 1 ページ２０１９年１０月３０日水曜日午前１１時２３分 ...

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Yamaha F25G, Owner'S Manual

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