Yamaha F250B Owner's Manual
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Yamaha F250B Owner's Manual

Yamaha F250B Owner's Manual

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F250B
FL250B
OWNER'S MANUAL
Read this manual carefully before operating this
outboard motor.
6BR-28199-23-E0

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Summary of Contents for Yamaha F250B

  • Page 1 F250B FL250B OWNER’S MANUAL Read this manual carefully before operating this outboard motor. 6BR-28199-23-E0...
  • Page 2 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.
  • Page 3 If there is any To the owner question concerning this manual, please con- Thank you for selecting a Yamaha outboard sult your Yamaha dealer. motor. This Owner’s Manual contains infor- To ensure long product life, Yamaha recom-...

  • Page 4: Table Of Contents

    Table of contents Safety information......1 Propeller selection ......11 Outboard motor safety ....1 Counter rotation models ....12 Start-in-gear protection ....12 Propeller ..........1 Rotating parts ........1 Engine oil requirements ....12 Hot parts..........1 Fuel requirements ......13 Electric shock ........
  • Page 5 Table of contents Overheat alert........31 Checks after engine warm up ..49 Water separator alert......32 Shifting ..........49 Engine trouble alert ......32 Stop switches ........49 Low battery voltage-alert ....32 Selecting outboard motor 6Y8 Multifunction speed & fuel (triple engine) ......
  • Page 6 Table of contents Checking propeller ......78 Removing propeller ......79 Installing propeller ......79 Changing gear oil ......80 Inspecting and replacing anode(s) ... 82 Checking battery (for electric start models) ....82 Connecting the battery ..... 83 Disconnecting the battery....85 Trouble Recovery ......

  • Page 7: Safety Information

    Safety information EMU33622 area at all times. Be sure no one is in this area Outboard motor safety before operating the power trim and tilt mech- Observe these precautions at all times. anism. EMU36501 The power trim and tilt switches operate even Propeller when the main switch is off.

  • Page 8: Carbon Monoxide

    Have an approved personal flotation device tions. Overloading incorrect weight (PFD) on board for every occupant. Yamaha distribution can compromise the boats han- recommends that you must wear a PFD dling and lead to an accident, capsizing or whenever boating. At a minimum, children swamping.

  • Page 9: Weather

    Safety information EMU33890 Boating safety publications Be informed about boating safety. Additional publications and information can be obtained from many boating organizations. EMU33600 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 ZMU06025 location, but all are basically the same as the...

  • Page 10: General Information

    General information EMU25171 TIP: Identification numbers record Consult your Yamaha dealer if you have any EMU25183 Outboard motor serial number questions concerning the digital electronic The outboard motor serial number is stamped control serial number. on the label attached to the port side of the clamp bracket.

  • Page 11: Key Number

    General information ZMU05958 1. Key number 1. Digital electronic control serial number loca- tion EMU25213 C-Tick label Engines affixed with this label conform to cer- tain portion(s) of the Australian Radio Com- munications Act. EMU25191 Key number If a main key switch is equipped with the mo- tor, the key identification number is stamped 1.

  • Page 12: Read Manuals And Labels

    Read any manuals supplied with the boat. Read all labels on the outboard motor and the boat. If you need any additional information, contact your Yamaha dealer. EMU33832 Warning labels If these labels are damaged or missing, contact your Yamaha dealer for replacements. F250B, FL250B...
  • Page 13 General information ZMU06191 Attach engine shut-off cord (lanyard) to EMU34651 Contents of labels your PFD, arm, or leg so the engine The above warning labels mean as follows. stops if you accidentally leave the helm, which could prevent a runaway boat. EWM01681 WARNING EMU33850...
  • Page 14 General information EMU35132 Electrical hazard Symbols The following symbols mean as follows. Notice/Warning ZMU05666 ZMU05696 Read Owner’s Manual ZMU05664 Hazard caused by continuous rotation ZMU05665...

  • Page 15: Specifications And Requirements

    Specifications and requirements EMU34520 Engine: Specifications Type: TIP: 4-stroke V “(AL)” stated in the specification data below Displacement: represents the numerical value for the alumi- 3352.0 cm³ Bore × stroke: num propeller installed. 94.0 × 80.5 mm (3.70 × 3.17 in) Likewise, “(SUS)”...

  • Page 16: Installation Requirements

    If the engine ever starts in gear, the EMU33564 start-in-gear protection device is not Boat horsepower rating working correctly and you should dis- EWM01560 continue using the outboard. Contact WARNING your Yamaha dealer. Overpowering a boat can cause severe in- stability.

  • Page 17: Battery Requirements

    EMU25721 Battery specifications propriate. Your Yamaha dealer can help you select the Minimum cold cranking amps (CCA/EN): right propeller for your boating needs. Select 711.0 A a propeller that will allow the engine to reach...

  • Page 18: Counter Rotation Models

    For instructions on propeller removal and in- stallation, see page 79 and 79. EMU35140 Start-in-gear protection Yamaha outboard motors or Yamaha-ap- proved digital electronic control units are equipped with start-in-gear protection de- vice(s). This feature permits the engine to be started only when it is in neutral.

  • Page 19: Fuel Requirements

    A tool kit with assorted screwdrivers, pliers, gine starting and running problems. Yamaha wrenches (including metric sizes), and does not recommend gasohol containing electrical tape.

  • Page 20: Emission Control Information

    DISPLACEMENT: liters IDLE SPEED: ± rpm IN NETRAL SPARK PLUG GAP (mm): SPARK PLUG: VALVE LASH (mm) IN: FUEL: GASOLINE YAMAHA MOTOR CO.,LTD. ZMU06894 EMU25332 Manufactured date label This label is attached to the clamp bracket or the swivel bracket.

  • Page 21: Components

    EMU2579W Components diagram TIP: * May not be exactly as shown; also may not be included as standard equipment on all models (order from dealer). F250B, FL250B ZMU06243 1. Top cowling 2. Anti-cavitation plate 3. Trim tab (anode) 4. Propeller* 5.
  • Page 22 Components ZMU07336 1. Digital electronic control (side-mount type)* 2. Clip 3. Engine shut-off switch 4. Switch panel (for use with side-mount type)* 5. Digital electronic control (single type)* 6. Switch panel (for use with single type)* 7. Digital electronic control (twin type)* 8.

  • Page 23: Digital Electronic Control

    Components ZMU05485 1. Tachometer unit (Square type)* 2. Speedometer unit (Square type)* 3. Speed & fuel meter unit (Square type)* 4. Fuel management meter (Square type)* EMU35943 Digital electronic control The digital electronic control actuates the shifter, the throttle and remote electrical oper- ations.

  • Page 24: Digital Electronic Control-Active Indicator

    Components ZMU05850 ZMU05959 1. Control lever 1. Control lever 2. Digital electronic control-active indicator 2. Digital electronic control-active indicator 3. Digital electronic control-alert indicator 3. Digital electronic control-alert indicator 4. Free throttle switch 4. Free throttle switch 5. Throttle friction adjuster 5.

  • Page 25: Digital Electronic Control-Alert Indicator

    1. Digital electronic control-active indicator 1. Digital electronic control-alert indicator EMU34984 Digital electronic control-alert indica- The digital electronic control-alert indicator lights when trouble occurs in the connection between the digital electronic control and out- board motor. Consult your Yamaha dealer for details.

  • Page 26: Control Lever

    Components ZMU05960 ZMU06228 1. Neutral “ ” 1. Digital electronic control-alert indicator 2. Forward “ ” EMU35822 Control lever 3. Reverse “ ” 4. Shift Moving the lever forward from the neutral po- 5. Fully closed sition engages forward gear. Pulling the lever 6.

  • Page 27: Free Throttle Switch

    Components 2. Fully closed 3. Free accelerator Single type ZMU06285 1. Neutral interlock trigger EMU35832 ZMU05880 Free throttle switch In neutral, keep this switch pressed, move the control lever forward, and release the switch 22.5 after the digital electronic control-active indi- cator starts blinking.

  • Page 28: Throttle Friction Adjuster

    Components During operation the digital electronic control- active indicator changes from continuously lit 22.5 to blinking. When the indicator starts blinking, the throttle begins to open after the control le- ver is moved at least 22.5°. After using the free throttle switch, return the control lever to the neutral position.

  • Page 29: Engine Selector Switch

    Components Single type EMU35720 Engine selector switch When all engines have started, you can select the desired engine for operation by pushing the engine selector switch. The engine selec- tor switch works only when all the control le- vers are in neutral. ZMU05820 Twin type ZMU05977...

  • Page 30: Main Switch

    Components boat could slow rapidly. This could cause people and objects in the boat to be thrown forward. START START TIP: The engine cannot be started with the clip re- moved. ZMU05818 1. Cord 2. Clip 3. Engine shut-off switch ZMU06235 1.

  • Page 31: Power Trim And Tilt Switch On Digital Electronic Control

    Components With the main switch in the “ ” (start) po- sition, the starter motor turns to start the en- START START START gine. When the key is released, it returns automatically to the “ ” (on) position. START ZMU07340 EMU35153 Power trim and tilt switch on digital electronic control...

  • Page 32: Power Trim And Tilt Switch On Bottom Cowling

    Components ZMU05822 EMU35851 EMU26154 Power trim and tilt switches Power trim and tilt switch on bottom The power trim and tilt system adjusts the out- cowling board motor angle in relation to the transom. The power trim and tilt switch is located on the Pushing the switch “...

  • Page 33: Trim Tab With Anode

    Components ECM00840 NOTICE The trim tab also serves as an anode to protect the engine from electrochemical corrosion. Never paint the trim tab as it will become ineffective as an anode. ZMU05964 1. Power trim and tilt switch On the twin engine control, the switch on the control grip controls both outboard motors at the same time.

  • Page 34: Tilt Support Lever For Power Trim And Tilt Model

    Components EMU26341 TIP: Tilt support lever for power trim and When installing the cowling, check to be tilt model sure it fits properly in the rubber seal. To keep the outboard motor in the tilted up po- Be sure to check that the gap between the sition, lock the tilt support lever to the clamp top cowling and the bottom cowling is even bracket.

  • Page 35: Fuel Filter/Water Separator

    Multifunction Tachometer will blink. The buzzer will sound intermittently only when the gear shift is in neutral. If the alert system has activated, stop the engine and consult a Yamaha dealer imme- diately. 1. Flushing device TIP: For details on usage, see page 69.

  • Page 36: Instruments And Indicators

    6. Water detection-alert indicator by connecting an optional sensor to the unit. 7. Battery voltage 8. Oil pressure (4-stroke models) For the optional sensor, consult your Yamaha dealer. The tachometer unit is available in EMU36120 Start-up checks round or square types. Check your tachome- Place the control lever in neutral and turn the ter unit type.

  • Page 37: Adjusting Trolling Speed

    Check the engine oil quantity and re- plenish oil if necessary. If the alert device has activated while the appropriate engine oil quantity is maintained, consult your Yamaha dealer. ECM01601 NOTICE Do not continue to run the engine if the ZMU05931 low oil pressure alert device has activated.

  • Page 38: Water Separator Alert

    Get back to value will start to blink. Get back to the port the port soon and consult a Yamaha dealer soon if the low battery voltage-alert device immediately.

  • Page 39: 6Y8 Multifunction Speedometers

    For the optional sen- 1. Set button 2. Mode button sors, consult your Yamaha dealer. After the main switch is first turned on, all the displays come on as a test. After a few sec- onds, the gauge will change to normal opera- tion.

  • Page 40: 6Y8 Multifunction Fuel Management Meters

    Instruments and indicators ZMU05436 ZMU05438 1. Set button 1. Set button 2. Mode button 2. Mode button ZMU05437 ZMU05439 1. Speedometer 1. Fuel flow meter 2. Fuel meter 2. Multifunction display 3. Multifunction display EMU36250 6Y8 Multifunction fuel manage- ment meters The fuel management meter has the func- tions of fuel flow meter, total consumption dis- play, fuel economy display, and remaining...

  • Page 41: Engine Control System

    Even if there is no symptom of trouble on shifting or throttle, get back to the port soon and have a Yamaha dealer inspect or repair the outboard motor. ZMU05960 1.

  • Page 42: Low Oil Pressure Alert

    Engine control system The buzzer will sound. If the alert system has activated, stop the en- gine and check the cooling water inlets: Check trim angle to be sure that the cooling water inlet is submerged. Check the cooling water inlet for clogging. ZMU06297 ZMU05826 Twin engine drive or triple engine drive users:...
  • Page 43 If the oil level is correct and the alert device does not switch off, consult your Yamaha dealer. Twin engine drive or triple engine drive users: If the low oil pressure alert system of one en- gine activates, all of the engines will slow down and the buzzer will sound.

  • Page 44: Installation

    If it is tor. mounted too high, propeller ventilation may Consult your Yamaha dealer or boat manu- occur, which will reduce propulsion due to ex- facturer for further information on determining cessive propeller slip, and the water intakes the proper mounting location.
  • Page 45 Test runs at different heights can help determine the optimum mounting height. Consult your Yamaha dealer or boat manufacturer for further information on deter- mining the proper mounting height. ZMU01762...

  • Page 46: Operation

    Operation EMU36381 For the first hour of operation: First-time operation Run the engine at varying speeds up to EMU36391 2000 r/min or approximately half throttle. Fill engine oil For the second hour of operation: The engine is shipped from the factory without Increase engine speed as much as nec- engine oil.

  • Page 47: Remove Cowling

    Check that the fuel filter is clean and free of water. If any water is found in the fuel, or if a significant amount of debris is found, the fuel tank should be checked and cleaned by a Yamaha dealer. ZMU06106 ZMU06108 EMU41770...

  • Page 48: Engine Shut-Off Cord (Lanyard)

    Operation the complete range of motion, and each le- Twin type ver should return completely to the idle po- sition. START START EMU36922 Engine shut-off cord (lanyard) Inspect the engine shut-off cord for damage, such as cuts, breaks, and wear. Single type ZMU05818 1.

  • Page 49: Engine

    Operation your Yamaha dealer if the oil level is out of specified level or if it appears milky or dirty. ZMU05972 1. Oil dipstick ZMU06164 1. Fitting 2. Flushing device EMU36941 Install cowling Be sure that all cowling lock levers are re- ZMU07057 1.

  • Page 50: Checking Power Trim And Tilt System

    After installing, check the fitting of the top completely. cowling by pushing it with both hands. If the top cowling is loose, have it repaired by your Yamaha dealer. 1. Tilt rod 2. Trim rods Use the tilt support lever to lock the motor in the up position.

  • Page 51: Battery

    Operation Tilt the outboard motor down. Check that the tilt rod and trim rods operate smooth- EMU36582 Battery Check that the battery is in good condition, and fully charged. Check that the battery con- nections are clean, secure and covered by in- sulating covers.

  • Page 52: Operating Engine

    Operation If you use a portable container to store EMU31812 Sending fuel and dispense fuel, only use a locally ap- If there is a fuel joint or a fuel cock on the proved GASOLINE container. boat, firmly connect the fuel line to the Touch the fuel nozzle to the filler opening joint or open the fuel cock.
  • Page 53 Operation 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 54 Operation Turn the main switch to “ ” (on) to make sure that the digital electronic control-ac- START tive indicator lights. The engine can not be started when the digital electronic con- trol-alert indicator lights. ZMU06246 START TIP: When the main switch is turned to “ ”...

  • Page 55: Checks After Starting Engine

    EMU35880 the cooling water pilot hole is blocked. Selecting outboard motor (tri- Consult your Yamaha dealer if the prob- ple engine) lem cannot be located and corrected. After all engines have started, set all control levers to Neutral.
  • Page 56 Operation The center engine runs at the average speed of port side and starboard side engines’ speeds. Operate the starboard side engine us- ing the starboard side control lever. Push the engine selector switch once to operate the port side and starboard side engines.

  • Page 57: Shifting

    Operation ZMU06299 ZMU05999 EMU35124 Shifting EWM00180 WARNING Before shifting, make sure there are no swimmers or obstacles in the water near you. Warm up the engine before shifting into gear. Until the engine is warm, the idle speed may ZMU06002 be higher than normal.
  • Page 58 Operation ZMU06239 ZMU06285 1. Neutral interlock trigger Move the control lever firmly and crisply forward (for forward gear) or backward (for reverse gear) 22.5° (a detent can felt). 22.5˚ 22.5˚ ZMU05832 After the engine is at idle speed in gear move the control lever firmly and crisply into the neutral position.

  • Page 59: Stopping Boat

    Operation ECM01740 NOTICE Be sure to tilt the unoperated motor up. Otherwise water could enter the exhaust pipe due to the wave action, causing en- gine trouble. ZMU05829 EMU31742 Stopping boat EWM01510 WARNING Do not use the reverse function to slow down or stop the boat as it could cause you to lose control, be ejected, or impact the steering wheel or other parts of the...
  • Page 60 Operation Operate the starboard side engine using the starboard side control lever. Operating the port side engine and center engine ZMU06004 Operate the port side engine using the port side control lever. When all engines have started, the center ZMU06006 engine will run at the average speed of port side and starboard side engines’...
  • Page 61 Operation ZMU06009 Operate the center engine using the port side control lever. Operate the starboard side engine using the starboard side control lever. Operating the center engine ZMU06002 ZMU06010 Operate the center engine using the port side control lever.

  • Page 62: Boat Direction

    Operation EMU35901 Boat direction The illustrations below indicate the boat direction when operating the three outboard motors. When using the port side engine, center engine and starboard side engine ZMU06011 :Boat direction and turning force The size of the arrow is proportional to the turning force. :Propulsion...
  • Page 63 Operation When using the port side engine and starboard side engine ZMU06012 :Boat direction and turning force The size of the arrow is proportional to the turning force. :Propulsion...

  • Page 64: Stopping Engine

    Operation When using the center engine ZMU06013 :Boat direction and turning force The size of the arrow is proportional to the turning force. :Propulsion EMU27821 Stopping engine Before stopping the engine, first let it cool off START for a few minutes at idle or low speed. Stop- ping the engine immediately after operating at high speed is not recommended.

  • Page 65: Trimming Outboard Motor

    Operation ZMU06014 1. Trim operating angle TIP: EMU27887 The engine can also be stopped by pulling the Adjusting trim angle (Power trim and cord and removing the clip from the engine tilt) shut-off switch, then turning the main switch EWM00753 WARNING to “...

  • Page 66: Adjusting Boat Trim

    Operation ZMU05964 ZMU06259 1. Power trim and tilt switch 1. Power trim and tilt switch ZMU05834 1. Power trim and tilt switch 1. Power trim and tilt switch To raise the bow (trim-out), press the switch “ ” (up). To lower the bow (trim-in), press the switch “...

  • Page 67: Tilting Up And Down

    Operation Bow Up TIP: Too much trim-out puts the bow of the boat Depending on the type of boat, the outboard too high in the water. Performance and econ- motor trim angle may have little effect on the omy are decreased because the hull of the trim of the boat when operating.

  • Page 68: Procedure For Tilting Up (Power Trim And Tilt Models)

    Operation To prevent the cooling water passages from becoming frozen when the ambient temperature is 5°C or below, tilt the out- board motor up after it has been stopped 30 seconds or more. EMU35509 Procedure for tilting up (power trim and tilt models) Place the control lever in neutral.
  • Page 69 Operation Set the tilt support lever to support the en- gine. WARNING! After tilting the out- board motor, be sure to support it with the tilt support knob or tilt support le- ver. Otherwise the outboard motor could fall back down suddenly if oil in the power trim and tilt unit or in the power tilt unit loses pressure.

  • Page 70: Procedure For Tilting Down (Power Trim And Tilt Models)

    Operation EMU35516 Procedure for tilting down (power trim and tilt models) Push the power trim and tilt switch “ ” (up) until the outboard motor is supported by the tilt rod and the tilt support lever be- comes free. Release the tilt support lever. ZMU05841 Push the power trim and tilt switch “...
  • Page 71 Operation Do not tilt the outboard motor up so that the cooling water inlet on the lower unit is above the surface of the water when setting up for and cruising in shallow water. Otherwise severe damage from overheating can result. EMU35236 Procedure for power trim and tilt models Place the control lever in neutral.

  • Page 72: Cruising In Other Conditions

    Cruising in muddy, turbid, or acidic water Yamaha strongly recommends that you use the optional chromium-plated water pump kit (see page 13) 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.

  • Page 73: Maintenance

    Leaking fuel is a fire hazard. Tighten se- viced by an authorized Yamaha dealer prior to curely the fuel valve when transporting storage. However, you, the owner, with a min- and storing the outboard motor.

  • Page 74: Procedure

    75. 3. Cap Change the gear oil. For instructions, see page 80. Inspect the oil for the presence of water that indicates a leaky seal. Seal replacement should be performed by an authorized Yamaha dealer prior to use.

  • Page 75: Flushing Power Unit

    Contact your the garden hose connector. Yamaha dealer for information about fogging With the engine off, turn on the water tap oil and procedures for your engine. and let the water flush through the cool- EMU34741 ing passages for about 15 minutes.

  • Page 76: Periodic Maintenance

    Replacement parts If replacement parts are necessary, use only EWM01871 WARNING genuine Yamaha parts or parts of equivalent design and quality. Any part of inferior quality These procedures require mechanical may malfunction, and the resulting loss of skills, tools, and supplies. If you do not...

  • Page 77: Maintenance Chart 1

    When operating in salt water, muddy, other turbid (cloudy), acidic water, 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. Initial Every Item Actions...
  • Page 78 Maintenance Initial Every Item Actions 20 hours 100 hours 300 hours 500 hours (3 months) (1 year) (3 years) (5 years) Fuel line (High pres- Inspection sure) Fuel line (High pres- Inspection or replace- sure) ment as necessary Fuel line (Low pres- Inspection sure) Fuel line (Low pres-...

  • Page 79: Maintenance Chart 2

    500 hours (3 months) (1 year) (3 years) (5 years) Wire harness connec- Inspection or replace- tions/wire coupler con- ment as necessary nections (Yamaha) Meter/gauge Inspection EMU34451 Maintenance chart 2 Every Item Actions 1000 hours Exhaust guide/exhaust Inspection or replace-...

  • Page 80: Greasing

    Maintenance EMU28943 Greasing Yamaha grease A (water resistant grease) Yamaha grease D (corrosion resistant grease; for propeller shaft) F250B, FL250B ZMU06248...

  • Page 81: Cleaning And Adjusting Spark Plug

    Do not attempt to di- agnose any problems yourself. Instead, take the outboard motor to a Yamaha dealer. You 1. Bolt should periodically remove and inspect the 2. Ignition coil spark plug because heat and deposits will Remove the spark plug.

  • Page 82: Inspecting Idling Speed

    Maintenance EMU35591 Inspecting idling speed ECM01690 NOTICE This procedure must be performed while the outboard motor is in the water. Perform this procedure using the 6Y8 Multi- function Tachometer. Results may vary de- pending on whether testing is conducted with the outboard motor in the water.
  • Page 83 If the be sure the level falls between the upper oil level is above the upper level mark, and lower marks. Consult your Yamaha drain until the level meets the speci- dealer if the oil level is out of specified lev- fied capacity.

  • Page 84: Inspecting Wiring And Connectors

    For more information on the disposal of switch to “ ” (off) and remove the key, used oil, consult your Yamaha dealer. and remove the clip from the engine shut- Change the oil more often when operating off switch. Turn off the battery cut-off the engine under adverse conditions such switch if your boat has one.

  • Page 85: Removing Propeller

    Remove the propeller nut, washer, and spacer (if equipped). WARNING! Do not Apply Yamaha marine grease or a corro- use your hand to hold the propeller sion resistant grease to the propeller when loosening the propeller nut.

  • Page 86: Changing Gear Oil

    NOTICE: If there is an excessive quantity of metal particles on the mag- netic gear oil drain screw, this can in- dicate lower unit problem. Consult your Yamaha dealer. [ECM01900] TIP: If the propeller nut does not align with the pro-...
  • Page 87 [ECM00713] 9.0 Nm (0.92 kgf-m, 6.6 ft-lb) TIP: For disposal of used oil, consult your Yamaha Securely install the cooling water inlet dealer. covers on both sides of the gear case us- Put the outboard motor in a vertical posi- ing the bolt and nut removed earlier.

  • Page 88: Inspecting And Replacing Anode(S)

    Inspecting and replacing anode(s) Inspect ground leads attached to external an- Yamaha outboard motors are protected from odes on equipped models. Consult a Yamaha corrosion by sacrificial anodes. Inspect the dealer for inspection and replacement of inter- external anodes periodically. Remove scales nal anodes attached to the power unit.

  • Page 89: Connecting The Battery

    Install a fully charged battery in Connecting an accessory battery (optional) the holder. If connecting an accessory battery, consult your Yamaha dealer about correct wiring. It is ECM01124 NOTICE recommendable to install the fuse to the isola- tor lead as shown in the illustration. For the Do not reverse the battery cables.
  • Page 90 Maintenance Single engine Twin engines ZMU05939 ZMU05941 1. Isolator lead with circuit protection 1. Starboard side engine 2. Red cable 2. Port side engine 3. Black cable 3. Red cable 4. Fuse 4. Black cable 5. Battery for accessories 5. Isolator leads with circuit protection 6.

  • Page 91: Disconnecting The Battery

    Maintenance Triple engines Disconnect the positive cable(s) and re- move the battery from the boat. Clean, maintain, and store the battery ac- cording to the manufacturer’s instruc- tions. ZMU05956 1. Starboard side engine 2. Center engine 3. Port side engine 4.

  • Page 92: Trouble Recovery

    If the engine trouble-alert indicator is blinking, consult your Yamaha dealer. Q. Is fuel pump malfunctioning? A. Have serviced by a Yamaha dealer. Starter will not operate. Q. Does the Digital electronic control-alert in- Q. Are spark plugs fouled or of incorrect type? dicator come on? A.
  • Page 93 Q. Is low oil pressure-alert indicator on or A. Clean or replace fuel filter. blinking? A. Have serviced by a Yamaha dealer. Q. Are ignition parts malfunctioning? A. Have serviced by a Yamaha dealer. Q. Is heat range of spark plugs incorrect? A.
  • Page 94 A. Find and correct cause of alert. Q. Is thermostat clogged or malfunctioning? Q. Is boat bottom fouled with marine growth? A. Have serviced by a Yamaha dealer. A. Clean boat bottom. Q. Is fuel tank air vent restricted or clogged? Q.

  • Page 95: Temporary Action In Emergency

    Normally use all outboard motors together for Consult your Yamaha dealer if the new fuse cruising. When using only one or two engines immediately blows again. in an emergency, be sure to keep the unused engine(s) tilted up and operate the other en- gine(s) at low speed.

  • Page 96: Power Trim And Tilt Will Not Operate

    Trouble Recovery 8. Engine main fuse (60 A) 9. Isolator fuse (60 A) EMU29524 Power trim and tilt will not operate If the engine cannot be tilted up or down with the power trim and tilt because of a dis- charged battery or a failure with the power trim and tilt unit, the engine can be tilted man- ually.
  • Page 97 Trouble Recovery The fuel filter must be reassembled carefully with the O-ring, filter cup, and hoses in place. Improper assembly or replacement could result in a fuel leak, which could result in a fire or explosion hazard. If the water separator-alert indicator on the 6Y8 Multifunction tachometer blinks, perform the following procedure.

  • Page 98: Treatment Of Submerged Motor

    If the outboard motor is submerged, immedi- filter housing. [ECM01970] ately take it to a Yamaha dealer. Otherwise Connect the water detection switch cou- some corrosion may begin almost immediate- pler securely until a click is heard.
  • Page 100 YAMAHA MOTOR CO., LTD. Printed in Japan April 2010–0.1 × 1 CR Printed on recycled paper...

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Fl250b

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