Yamaha F25A Owner's Manual
  1. Manuals
  2. Brands
  3. Yamaha Manuals
  4. Outboard Motor
  5. F25A
  6. Owner's manual

Yamaha F25A Owner's Manual

Outboard motor f25a; t25a
Hide thumbs Also See for F25A:
Table of Contents

Quick Links

See also: Service Manual
F25A
T25A
OWNER'S MANUAL
U.S.A.Edition
LIT-18626-04-70
Table of Contents
loading

Related Manuals for Yamaha F25A

Summary of Contents for Yamaha F25A

  • Page 1 F25A T25A OWNER’S MANUAL U.S.A.Edition LIT-18626-04-70...
  • Page 3 NOTE: Yamaha. If you have any question about the A NOTE provides key information to make operation or maintenance of your outboard procedures easier or clearer.

  • Page 5: Table Of Contents

    EMU00003 CONTENTS GENERAL INFORMATION BASIC COMPONENTS OPERATION MAINTENANCE TROUBLE RECOVERY INDEX READ THIS OWNER’S MANUAL CAREFULLY BEFORE OPERATING YOUR OUTBOARD MOTOR.

  • Page 7: General Information

    EMU00004 Chapter 1 GENERAL INFORMATION IDENTIFICATION NUMBERS RECORD ..1-1 Outboard motor serial number...1-1 Key number...........1-1 EMISSION CONTROL INFORMATION...1-2 SAFETY INFORMATION......1-4 IMPORTANT LABELS ......1-6 BASIC BOATING RULES ......1-7 FUELING INSTRUCTIONS.....1-11 Gasoline (Petrol).........1-12 ENGINE OIL ..........1-13 BATTERY REQUIREMENT ....1-14 PROPELLER SELECTION .......1-15 START-IN-GEAR PROTECTION ....1-16...

  • Page 8: Identification Numbers Record

    Record your outboard motor serial num- ber in the spaces provided to assist you in 401013 ordering spare parts from your Yamaha dealer or for reference in case your out- board motor is stolen. 1 Outboard motor serial number...

  • Page 9: Emission Control Information

    EMU01385 EMISSION CONTROL INFORMATION EMU01387 NORTH AMERICAN MODELS This engine conforms to U.S. Environ- mental Protection Agency (EPA) regula- tions for marine SI engines. See the label affixed to your engine for details. Approval label of Emission control certificate This label is attached to the bottom cowl- ing.
  • Page 10 EMU01389 STAR LABELS Your outboard motor is labeled with a California Air Resources Board (CARB) star label. See below for a description of your particular label. 1 Star label 000853 One Star - Low Emission The one-star label identifies engines that meet the Air Resources Board’s 2001 exhaust emission standards.

  • Page 11: Safety Information

    8 This product emits exhaust gases which EMU00917 SAFETY contain carbon monoxide, a colorless, INFORMATION odorless gas which may cause brain damage or death when inhaled. Symp- toms include nausea, dizziness, and 8 Before mounting or operating the out- drowsiness. Keep cockpit and cabin board motor, read this entire manual.
  • Page 12 8 Be informed about boating safety. Addi- tional publications and information can be obtained from many organizations, including the following: United States Coast Guard Consumer Affairs Staff (G-BC) Office of Boating, Public, and Consumer Affairs U.S. Coast Guard Headquarters Washington, D.C. 20593-0001 Boating Safety Hotline: 1-800-368-5647 National Marine Manufacturers Association (NMMA)

  • Page 13: Important Labels

    EMU00014 IMPORTANT LABELS WARNING LABELS WARNING This engine is equipped with a neutral starting device. The engine will not start unless the shift control is in neutral position. 202054* 6E0-83627-41 WARNING 7Be sure shift control is in neutral before starting engine. (except 2HP) 7Do not touch or remove electrical parts when starting or during operation.

  • Page 14: Basic Boating Rules

    EMU00015 Stand-on vessel BASIC BOATING RULES The vessel with the right-of-way has the duty to continue its course and speed, (Rules of the road) except to avoid an immediate collision. When you maintain your direction and Just as there are rules which apply when speed, the other vessel will be able to you are driving on streets and high ways, determine how best to avoid you.
  • Page 15 RULES WHEN ENCOUNTERING will clear one another if you continue on your set course and speed. VESSELS There are three main situations which you may encounter with other vessels which could lead to a collision unless the Steer- ing Rules are followed: Meeting (you are approaching another vessel head-on) Crossing (you are traveling across the...
  • Page 16 its course and speed. You must stay out Sailing vessel right-of-way of its way until you are clear of it. Like- Sailing vessels should normally be given wise, if another vessel is passing you, you the right-of-way. The exceptions to this should maintain your speed and direction are: so that the other vessel can steer itself...
  • Page 17 tion. These markers are white with black letters and orange boarders. They signify speed zones, restricted areas, danger areas, and general information. Remember, markings may vary by geo- graphic location. Always consult local boating authorities before driving your boat in unfamiliar waters. MAIN CHANNEL BUOYS "...

  • Page 18: Fueling Instructions

    EMU00016 FUELING INSTRUCTIONS GASOLINE AND ITS VAPORS ARE HIGH- LY FLAMMABLE AND EXPLOSIVE! 8 Do not smoke when refueling, and keep away from sparks, flames, or other sources of ignition. 8 Stop engine before refueling. 8 Refuel in a well-ventilated area. Refuel portable fuel tanks off the boat.

  • Page 19: Gasoline (Petrol)

    EMU00025 GASOLINE (PETROL) Recommended gasoline: Regular unleaded gasoline with a minimum octane rating of 86 (Pump Octane Number) = (R+M)/2 If knocking or pinging occurs, use a differ- ent brand of gasoline or premium unlead- ed fuel. If unleaded gasoline is not avail- able, then leaded regular gasoline can be used.

  • Page 20: Engine Oil

    EMU01149 ENGINE OIL Recommended engine oil; Use a combination of corresponding SAE and API shown in the chart below; 10W-30 10W-40 20W-40 Engine oil quantity: Refer to “SPECIFICATIONS”, Page 4-1. All four-stroke engines are shipped from the factory without engine oil. NOTE: If the recommended engine oil is not available, then a multigrade type engine...

  • Page 21: Battery Requirement

    EMU01430¯ BATTERY REQUIREMENT Do not use a battery that does not meet the specified capacity. If a battery which differs from the specification is used, the electrical system may perform poorly or be overloaded, causing electrical system damage. 8 A battery cannot be connected to mod- els which do not have a rectifier or rec- tifier regulator.

  • Page 22: Propeller Selection

    12-1/4 x 9 - G peller is more suitable for a smaller oper- ating load. Yamaha dealers stock a range of pro- pellers, and can advise you and install a propeller on your outboard that is best suited to your application.

  • Page 23: Start-In-Gear Protection

    3 Type of propeller (propeller mark) Refer to the section “CHECKING PRO- PELLER” for instructions on propeller removal and installation. EMU01209 START-IN-GEAR PROTECTION Yamaha outboard motors or Yamaha approved remote control units equipped with start-in-gear protection device(s). This feature permits the engine to be started only when it is Neutral.
  • Page 24 -MEMO-...

  • Page 25: Basic Components

    EMU00037 Chapter 2 BASIC COMPONENTS MAIN COMPONENTS......2-1 OPERATIONS OF CONTROLS AND OTHER FUNCTIONS ........2-2 Fuel tank..........2-2 Gear shift lever ........2-3 Recoil starter handle......2-3 Starter button ........2-3 Tiller handle...........2-3 Remote control........2-6 Steering friction adjusting lever..2-10 Trim tab..........2-11 Trim angle adjusting rod....2-13 Power trim/tilt switch......2-13 Warning indicator(s) ......2-14 Digital tachomoter ......2-14...

  • Page 26: Main Components

    EMU01206 MAIN COMPONENTS 1 Top cowling * r Gear shift lever 2 Top cowling lock lever * t Tiller handle 3 Oil drain bolt * y Steering friction adjusting lever 4 Anti-cavitation plate * u Clamp screw 5 Trim tab * i Rope attachment 6 Propeller * o Tilt lock lever...

  • Page 27: Operations Of Controls And Other Functions

    EMU00039 OPERATIONS OF CONTROLS OTHER FUNCTIONS EMU00040 FUEL TANK If your model was equipped with a portable fuel tank, its function is as fol- lows. 1 Fuel hose joint 2 Fuel meter (If equipped) 3 Fuel tank cap 4 Air vent screw (If equipped) EMU00042 Fuel Hose Joint This connector is provided for connecting...

  • Page 28: Gear Shift Lever

    EMU00051 GEAR SHIFT LEVER (for Tiller control model) Turning the gear-shift lever towards you engages the clutch with the forward gear so that the boat moves ahead. Turning the lever away from you engages the reverse gear so that the boat moves astern.
  • Page 29 EMU00065 Throttle Control Grip The throttle control grip is on the tiller handle. Turn the grip counterclockwise to increase speed and clockwise to decrease speed. EMU00067 Throttle Indicator The fuel consumption curve on the throt- tle indicator shows the relative amount of fuel consumed for each throttle position.
  • Page 30 EMU00932 Engine Stop Lanyard Switch The lock-plate 1 must be attached to the engine stop lanyard switch for the engine to run. The lanyard 2 should be attached to a secure place on the operator’s cloth- ing, or arm or leg. Should the operator fall overboard or leave the helm, the lanyard will pull out the lock plate, stopping igni- tion to the engine.

  • Page 31: Remote Control

    EMU00096* REMOTE CONTROL Both the shifter and the throttle are actu- ated by the remote control lever. Additionally, the remote control also has the electrical switches. 1 Remote control lever 2 Neutral interlock trigger 3 Neutral throttle lever 000200 4 Main switch 5 Engine stop lanyard switch 6 Power trim and tilt switch (if equipped) 7 Throttle friction adjusting screw...
  • Page 32 EMU00100 Neutral Throttle Lever To open the throttle without shifting into either Forward or Reverse, place the remote control lever in the Neutral posi- tion and lift the neutral throttle lever. NOTE: The neutral throttle lever will operate only when the remote control lever is in 701033* Neutral.
  • Page 33 EMU00934 Engine Stop Lanyard Switch The lock-plate 1 must be attached to the engine stop lanyard switch for the engine to run. The lanyard 2 should be attached to a secure place on the operator’s cloth- ing, or arm or leg. Should the operator fall overboard or leave the helm, the lanyard will pull out the lock plate, stopping igni- tion to the engine.
  • Page 34 EMU01331 Power Trim/Tilt Switch The power trim/tilt adjusts the motor angle in relation to the transom. The power trim/tilt switch is located on the remote control lever grip. Pushing the switch “UP” trims the motor up, then tilts the motor up. Pressing the switch “DN” tilts the motor down and trims the motor 701034* down.

  • Page 35: Steering Friction Adjusting Lever

    EMU00110* STEERING FRICTION ADJUSTING LEVER A friction device provides resesistance steering movement. This is adjustable for operator preference. Resistance Lever Increase Turn clockwise 408026 Decrease Turn counterclockwise Do not overtighten the friction adjusting lever. If there is too much resistance, it may be difficult to steer, which could result in an accident.

  • Page 36: Trim Tab

    EMU00114 TRIM TAB The trim tab should be adjusted so that the steering control can be turned to either the right or left by applying the same amount of force. An improperly adjusted trim tab may cause difficult steering. Always test run after the trim tab has been installed or replaced to be sure steering is correct.
  • Page 37 EMU00113* TRIM TAB FT25 The trim tab should be adjusted so that the steering control can be turned to either the right or left by applying the same amount of force. An improperly adjusted trim tab may cause difficult steering. Always test run after the trim tab has been installed or FT25 replaced to be sure steering is correct.

  • Page 38: Trim Angle Adjusting Rod

    EMU01297 TRIM ANGLE ADJUSTING ROD The position of the trim angle adjusting rod determines the minimum trim angle of the outboard motor in relation to the transom. 404012 EMU01125 POWER TRIM/TILT SWITCH The power trim/tilt adjusts the motor angle in relation to the transom. The power trim/tilt switch is located on the side of the bottom engine cowling.

  • Page 39: Warning Indicator(S)

    EMU01128 WARNING INDICATOR(S) If the engine develops a condition moni- tored by the warning system, an indicator will come on. Refer to the “WARNING SYSTEM” sec- tion for details. 1 Warning indicator(s) 223012 EMU01617 DIGITAL TACHOMETER This gauge contains the tachometer, trim meter, hour meter, low oil pressure warn- ing indicator, and the overheat warning indicator.
  • Page 40 EMU01109 Trim Meter This meter shows the trim angle of your outboard motor. NOTE: 8 Memorize the trim angles that work best for your boat under different condi- tions. Adjust the trim angle to the desired setting by operating the power 001059 trim and tilt switch.
  • Page 41 EMU01110 Low Oil Pressure Warning Indicator If oil pressure drops too low, the warning indicator will start to blink. Refer to the section “LOW OIL PRESSURE WARNING” for details. 1 Low oil pressure warning indicator 001060 8 Do not operate the engine without oil. Serious engine damage will occur.

  • Page 42: Tilt Lock Mechanism

    EMU00153 TILT LOCK MECHANISM (for Manual tilt model) The tilt-lock mechanism is used to pre- vent reverse thrust from the propeller lift- ing the outboard motor when reversing. To lock it, set the tilt-lock lever in the Lock position. To release it, place the tilt-lock lever in the 402073 Tilt position.

  • Page 43: Flushing Device

    EMU01146 FLUSHING DEVICE This device 1 is used to clean the cooling water passages of the motor using a gar- den hose and tap water. NOTE: Refer “Cleaning Cooling-water Passages” in Chapter 4 for instructions on usage. 101043* 2-18...

  • Page 44: Warning System

    EMU00169 WARNING SYSTEM Do not continue to operate the engine if the warning device has activated. Consult your Yamaha dealer if the problem can- not be located and corrected. 001053 EMU01476 OVERHEAT WARNING This engine has an overheat warning device. If the engine temperature rises too high, the warning device will activate.

  • Page 45: Low Oil Pressure Warning

    Check oil level and add oil as needed. If the oil level is correct, consult your 001063 Yamaha dealer. Do not continue to run the engine if the low oil pressure lamp is “ON”. Serious engine damage may occur.
  • Page 46 -MEMO-...

  • Page 47: Operation

    EMU00174 Chapter 3 OPERATION INSTALLATION ........3-1 Mounting the outboard motor ....3-2 Clamping the outboard motor.....3-4 BREAKING IN (RUNNING IN) ENGINE ..3-5 PRE-OPERATION CHECKS ......3-6 Checking the engine oil level....3-7 FILLING FUEL ...........3-8 STARTING ENGINE .........3-9 WARMING UP ENGINE ......3-14 SHIFTING ..........3-15 Forward..........3-15 Reverse ..........3-16 STOPPING ENGINE .......3-17...

  • Page 48: Installation

    EMU00175 INSTALLATION Incorrect engine height or obstructions to smooth water flow (such as the design or condition of the boat or accessories such as transom ladders/depth finder trans- ducers) can create airborne water spray while the boat is cruising. Severe engine damage may result if the motor is operat- ed continuously in the presence of air- borne water spray.

  • Page 49: Mounting The Outboard Motor

    EMU00176 MOUNTING THE OUTBOARD MOTOR Improper mounting of the outboard motor could result in hazardous condi- tions such as poor handling, loss of con- trol, or fire hazards. Observe the follow- ing: 8 The information presented in this sec- tion is intended as reference only. It is not possible to provide complete instructions every...
  • Page 50 Overpowering a boat may cause severe instability. Do not install an outboard motor with more horsepower than the maximum rating on the capacity plate of the boat. If the boat does not have a capacity plate, consult the boat manufac- turer.

  • Page 51: Clamping The Outboard Motor

    EMU01318 CLAMPING THE OUTBOARD MOTOR Manual tilt model 1) Place the outboard on the transom so that it is positioned as close to the center as possible. Tighten the tran- som clamp screws evenly and secure- ly. Check the clamp-screws for tight- ness occasionally during operation of 409011 the motor as they can work loose due...

  • Page 52: Breaking In (Running In) Engine

    EMU00224 BREAKING IN (RUNNING IN) ENGINE Your new engine requires a period of break-in (running-in) to allow mating sur- faces of moving parts to wear-in evenly. Correct break-in (running-in) will help ensure proper performance and longer engine life. Failure to follow the break-in (running-in) procedure may result in reduced engine life or even severe engine damage.

  • Page 53: Pre-Operation Checks

    EMU00204 PRE-OPERATION CHECKS If any item in the pre-operation check is not working properly, have it inspected and repaired before operating the out- board motor. Otherwise, an accident could occur. Do not start the engine out of water. Overheating and serious engine damage can occur.

  • Page 54: Checking The Engine Oil Level

    EMU00209 Controls 8 Check throttle, shift, and steering for proper operation before starting the engine. 8 The controls should work smoothly, without binding or unusual free play. 8 Look for loose or damaged connec- tions. 8 Check operation of the starter and stop switches when the outboard motor is in the water.

  • Page 55: Filling Fuel

    While many additives available may reduce deposits, Yamaha recommends the use of Ring Free Fuel Additive, avail- able from your Yamaha dealer. Ring Free has repeatedly proven its ability to clean combustion deposits from inside the engine, notably the critical piston-ring- land area, and fuel system components.

  • Page 56: Starting Engine

    EMU01147 STARTING ENGINE 8 Before starting the engine, make sure that the boat is tightly moored and that you can steer clear of any obstructions. Be sure there are no swimmers in the 902053 water near you. 8 When the air vent screw is loosened, gasoline (petrol) vapor will be released.
  • Page 57 EMU01497 PROCEDURE FOR TILLER CONTROL MODEL 4) Place the gear-shift lever in the neu- tral position. NOTE: The start-in-gear protection device pre- vents the engine from starting except when in Neutral. 5) Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg.
  • Page 58 EMU01005 Manual Start Model 7) Pull the starter handle slowly until you feel resistance. Then, give a strong pull straight out to crank and start the engine. Repeat it, if neces- sary. NOTE: If the warm engine fails to start, open the throttle slightly and try to start the engine.
  • Page 59 EMU00247 PROCEDURE FOR REMOTE CONTROL MODEL 4) Place the remote control lever in the Neutral position. NOTE: The start-in-gear protection device pre- vents the engine from starting except when in Neutral. 701015 5) Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg.
  • Page 60 EMU00949 Electric Start Model 7) Turn the main switch to “START”, START and hold it for a maximum of 5 sec- onds. 8) Immediately after the engine starts, release the main switch to return it to “ON”. 701022 8 Do not turn the main switch to “START”...

  • Page 61: Warming Up Engine

    Check the oil level and add oil if necessary. If the cause for the low oil pressure warning indicator cannot be found, consult your Yamaha dealer. 8 A continuous flow of water from the pilot hole shows that the water pump is pumping water through the cooling passages.

  • Page 62: Shifting

    EMU00261 SHIFTING Before shifting, make sure there are no swimmers or obstacles in the water near you. To change the shifting position from for- ward to reverse or vice-versa, close the throttle first so that the engine idles (or runs at low speeds). START EMU00265 FORWARD...

  • Page 63: Reverse

    EMU01326 REVERSE When operating in Reverse, go slowly. Do START not open the throttle more than half. Otherwise, the boat may become unsta- ble, which could result in loss of control and an accident. 1) Place the throttle control grip in the fully closed position (for Tiller control model).

  • Page 64: Stopping Engine

    EMU00273 STOPPING ENGINE Let it cool off for a few minutes at idle or low speed first. Stopping the engine immediately after operating at high speed is not recommended. 506021 EMU00277 1) Push and hold the engine stop button START or turn the main switch to “OFF”.

  • Page 65: Trimming Outboard Motor

    EMU01412 TRIMMING OUTBOARD MOTOR The trim angle of the outboard motor helps determine the position of the bow of the boat in the water. The correct trim angle will help improve performance and fuel economy while reducing strain on the engine.

  • Page 66: Adjusting Trim Angle

    ADJUSTING TRIM ANGLE EMU00951* Manual tilt model There are 4 or 5 holes provided in the clamp bracket to adjust the outboard motor trim angle. 1) Stop the engine. 2) Remove the trim angle adjusting rod 1 from the clamp bracket while tilting 404012* the motor up slightly.
  • Page 67 EMU01401 Power Trim/Tilt Model 8 Be sure all people are clear of the out- board motor when adjusting the trim/tilt angle, also be careful not to pinch any body parts between the drive unit and clamp bracket. 701034** 8 Use caution when trying a trim position for the first time.
  • Page 68 EMU00282 Bow Up When the boat is on plane, a bow-up atti- tude result in less drag, greater stability and efficiency. This is generally when the keel line of the boat is up about 3 to 5 degrees. When trimmed out, the boat may have more tendency to steer to one side or the other.

  • Page 69: Tilting Up/Down

    EMU00285 TILTING UP/DOWN If the engine will be stopped for some time, or if the boat is moored in shallows, the engine should be tilted up to protect the propeller and casing from damage by collision with obstructions, and also to 105031 reduce salt corrosion.
  • Page 70 EMU00290 PROCEDURE FOR TILTING UP Manual tilt model 1) Place the gear shift lever in Neutral. 2) Remove the fuel line connection from the motor. 304043 3) Place the tilt lock lever in the release position. 402071 4) Hold the rear of the top cowling with one hand and fully tilt the engine up.
  • Page 71 EMU00296 PROCEDURE FOR TILTING UP Power trim/tilt model 1) Remove the fuel-line connection from the motor. 304043 2) Push the power trim/tilt switch “UP” until the outboard has tilted up com- pletely. 701034* 3) Push the tilt support knob into the clamp bracket to support the engine.

  • Page 72: Cruising In Shallow Water

    EMU00306 CRUISING IN SHALLOW WATER Manual tilt model The outboard motor can be tilted up par- tially to allow operation in shallow water. 8 Place the gear shift in the Neutral posi- tion before using the shallow water cruising system. 8 Run the boat at the lowest possible speed when using the shallow water cruising system.
  • Page 73 EMU00310 PROCEDURE 1) Place the gear shift lever in the neu- tral position. 2) Place the tilt lock lever in the release position. 402071 3) Slightly tilt up the engine. The tilt- support bar will lock automatically, supporting the engine in a partially raised position.

  • Page 74: Cruising In Other Conditions

    EMU00316 CRUISING IN OTHER CONDITIONS CRUISING IN SALT WATER After operating in salt water, wash out the cooling-water passages with fresh water to prevent them from becoming clogged- up with salt deposits. NOTE: Refer to cooling system flushing instruc- tions in “TRANSPORTING AND STORING OUTBOARD MOTOR”.

  • Page 75: Maintenance

    EMU00317 Chapter 4 MAINTENANCE SPECIFICATION DATA......4-1 TRANSPORTING AND STORING OUTBOARD MOTOR .......4-4 Trailering outboard motor ....4-4 Storing outboard motor .......4-5 PERIODIC MAINTENANCE....4-10 Replacement parts ......4-10 Maintenance chart ......4-11 Greasing..........4-12 Cleaning and adjusting spark plug ...4-14 Checking fuel system ......4-16 Inspecting fuel filter ......4-17 Adjusting idling speed .......4-18 Changing engine oil......4-19 Checking timing belt......4-21...

  • Page 76: Specification Data

    EMU00322* SPECIFICATION DATA Model Unit F25MHA Item DIMENSIONS Overall Length mm (in.) 1,151 (45.3) Overall Width mm (in.) 430 (16.9) Overall Height S/L/X mm (in.) 1,148 (45.2)/1,275 (50.2)/1,354(53.5) Transom height S/L/X mm (in.) 423 (16.7)/550 (21.7)/636(25.0) Weight S/L/X kg (lb.) 62 (137)/64 (141)/66(146) PERFORMANCE Full throttle operating range...
  • Page 77 F25EHA F25ERA F25TRA 1,151 (45.3) 703 (27.7) 703 (27.7) 430 (16.9) 376 (14.8) 376 (14.8) 1,148 (45.2)/1,275 (50.2)/1,354 (53.3) 1,148 (45.2)/1,275 (50.2)/— —/1,275 (50.2)/— 423 (16.7)/550 (21.7)/636 (25.0) 423 (16.7)/550 (21.7)/— —/550 (21.7)/— 66 (146)/68 (150)/70 (154) 65 (143)/67 (148)/— —/71 (157)/—...
  • Page 78 EMU00322* SPECIFICATION DATA Model Unit T25TRA Item DIMENSIONS Overall Length mm (in.) 713 (28.1) Overall Width mm (in.) 373 (14.7) Overall Height S/L/X mm (in.) —/1,311 (51.6)/1,425 (56.1) Transom height S/L/X mm (in.) —/528 (20.8)/642 (25.3) Weight S/L/X kg (lb.) —/87 (192)/90 (198) PERFORMANCE Full throttle operating range...

  • Page 79: Transporting And Storing Outboard Motor

    For further details, consult your Yamaha dealer. 001213 8 Never get under the lower unit while it is tilted, even if a motor support bar is used.
  • Page 80 “Yamaha Fuel Conditioner and Stabilizer” (Part No. LUB-FUELC-12- 00) to each gallon of fuel. NOTE: The use of “Yamaha Fuel Conditioner and Stabilizer” eliminates the need to drain the fuel system. Consult your Yamaha dealer or other qualified mechanic if the...
  • Page 81 4) Run the engine at a fast idle for 10~15 minutes. 5) Just prior to turning off the engine, quickly spray “Yamaha Stor-Rite Engine Fogging Oil” (Part No. LUB- STRRT-12-00) alternately into each carburetor. When properly done, the engine will smoke excessively and almost stall.
  • Page 82 3) Run the engine at a fast idle for 10~15 minutes supplying fresh water. 4) Just prior to turning off the engine, quickly spray “Yamaha Stor-Rite Engine Fogging Oil” (Part No. LUB- STRRT-12-00) alternately into the silencer cover. When properly done, the engine will smoke excessively and almost stall.
  • Page 83 1) Wash down the exterior of the out- board with fresh water and dry off completely. 2) Spray the engine’s exterior with “Yamaha Silicone Protectant” (Part No. LUB-SILCNE-13-00). 3) Wax the cowling with a non-abrasive wax such as “Yamaha Silicone Wax” (Part No. ACC-11000-15-02).
  • Page 84 EMU00353 Battery Care Battery electrolyte is poisonous and dan- gerous, causing severe burns, etc. It con- tains sulfuric acid. Avoid contact with skin, eyes, or clothing. Antidote: EXTERNAL; Flush with water. INTERNAL; Drink large quantities of water or milk. Follow with milk of mag- nesia, beaten egg, or vegetable oil.

  • Page 85: Periodic Maintenance

    Be sure to turn off the engine when you perform maintenance unless otherwise specified. If the owner is not familiar with machine servicing, this work should be done by a Yamaha dealer or other quali- fied mechanic. Maintenance, replacement, or repair of the emission control devices and systems may be performed by any marine engine repair establishment or individual.

  • Page 86: Maintenance Chart

    Frequency of maintenance operations may be adjusted according to the operating con- ditions, but the following table gives general guidelines. The mark ( ) indicates the check-ups which you may carry out yourself. The mark (1) indicates work to be carried out by your Yamaha dealer. Initial Every...

  • Page 87: Greasing

    EMU00366 GREASING Yamaha marine grease (Water resistant grease) 4-12...
  • Page 88 EMU00366 GREASING Yamaha marine grease (Water resistant grease) 103182 4-13...

  • Page 89: Cleaning And Adjusting Spark Plug

    Do not attempt to diagnose any problems yourself. Instead, take the outboard motor to a Yamaha dealer. You should periodically remove and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode.
  • Page 90 When fitting the plug, always clean the gasket surface and use a new gasket. Wipe off any dirt from the threads and screw in the spark plug to the correct torque. Spark plug torque: Refer to “SPECIFICATIONS”, page 4-1. NOTE: If a torque-wrench is not available when you are fitting a spark plug, a good esti- mate of the correct torque is 1/4 to 1/2 a...

  • Page 91: Checking Fuel System

    Check the fuel line for leaks, cracks, or malfunctions. If any problem is found, it should be repaired immediately by Yamaha dealer or other qualified mechan- Checking points 8 Fuel system parts leakage. 8 Fuel hose joint leakage.

  • Page 92: Inspecting Fuel Filter

    EMU00374 Check the fuel filter periodically. The fuel filter is a one-piece, disposable type. If foreign matter is found in the fil- ter, replace it. For replacement of the fuel filter, consult a Yamaha dealer. 4-17...

  • Page 93: Adjusting Idling Speed

    Correct idling-speed adjustment is only possible if the engine is fully warmed-up. If not warmed up fully, the speed setting will tend to be too high. If you have diffi- culty obtaining the specified idle, consult a Yamaha dealer or other qualified mechanic. 4-18...

  • Page 94: Changing Engine Oil

    EMU01415 CHANGING ENGINE OIL 8 Avoid draining the engine oil immedi- ately after stopping the engine. The oil is hot and should be handled with care to avoid burns. 8 Be sure the outboard is securely fas- tened to the transom or a stable stand. 8 Change the engine oil after the first 10 hours of operation, and every 100 hours or at 6-month intervals thereafter.
  • Page 95 Continued operation with a problem could cause severe engine damage. If the problem cannot be found and corrected, consult your Yamaha deal- 6) Turn off the engine and wait 3 min- utes. Recheck the oil level using the dipstick to be sure the level falls between the upper and lower marks.

  • Page 96: Checking Timing Belt

    8 Belt surfaces roughened. 206013 8 Signs of wear on edges or outer surface of belt. 8 Stretching by 10 mm (0.39 in) or more when the belt is pushed with a finger. Consult your Yamaha dealer when replac- ing the timing-belt. 4-21...

  • Page 97: Replacing Fuse

    This could cause electrical system damage and a fire hazard. NOTE: If the new fuse blows again immediately, consult a Yamaha dealer. 1 Fuse holder 2 Fuse (20A) EMU00383 CHECKING WIRING AND CONNECTORS 1) Check that each grounding wire is properly secured.

  • Page 98: Checking Power Trim And Tilt System

    5) Operate the motor to trim and tilt down. Check that the trim and tilt rod operates smoothly. NOTE: If any operation is abnormal, consult a Yamaha dealer. Recommended fluid; Yamaha power trim & tilt fluid or ATF (DEXRON-II) 4-23...

  • Page 99: Checking Propeller

    EMU00388 CHECKING PROPELLER You could be seriously injured if the engine accidentally starts while you are near the propeller. 8 Before inspecting, removing or installing the propeller, remove the 210011 spark plug caps from the spark plugs. Also, put the shift control in Neutral, put the main switch in the “OFF”...
  • Page 100 Otherwise, the propeller could come off during operation and be lost. 1) Apply Yamaha Marine grease or Corrosion resistant grease to the pro- peller-shaft. 2) Install the thrust washer and propeller on the propeller-shaft. 3) Install the spacer and washer. Tighten the propeller nut to the specified torque.

  • Page 101: Changing Gear Oil

    Tightening torque: Refer to “SPECIFICATIONS” page 4-1. 4) Align the propeller nut with the pro- peller shaft hole. Insert a new cotter pin in the hole and bend the cotter pin ends. NOTE: If the propeller nut does not align with the 602053 propeller shaft hole after tightening to the specified torque, then tighten the nut fur-...
  • Page 102 Inspect the used oil after it has been drained. If the oil is milky, water is get- ting into the gear-case which can cause gear damage. Consult a Yamaha dealer for repair of the lower unit seals. NOTE: For disposal of used oil consult your Yamaha dealer.

  • Page 103: Cleaning Fuel Tank

    Gasoline (petrol) is highly flammable, and its vapors are flammable and explosive. 8 If you have any question about properly doing this procedure, consult your Yamaha dealer. 902054 8 Keep away from sparks, cigarettes, flames or other sources of ignition when cleaning the fuel tank.

  • Page 104: Inspecting And Replacing Anode(S)

    EMU00831 INSPECTING AND REPLACING ANODE(S) Yamaha outboard motor is protected from corrosion by a sacrificial anode(s). Check the anode(s) periodically. Remove the scales from surfaces of the anode(s). For the inspection and replacement of the 604024 405014 anode(s), consult a Yamaha dealer.

  • Page 105: Checking Battery

    EMU00404 CHECKING BATTERY (for Electric start model) Battery electrolytic fluid is dangerous; it contains sulfuric acid and therefore is poi- sonous and highly caustic. Always follow these preventive mea- sures: 8 Avoid bodily contact with electrolytic fluid as it can cause severe burns or permanent eye injury.
  • Page 106 8 A poorly maintained battery will quick- ly deteriorate. 8 Ordinary tap-water contains minerals harmful to a battery, and should not be used for topping-up. 1) Check the electrolyte level at least 901015 once a month. Fill to the manufactur- er’s recommended level when neces- sary.

  • Page 107: Checking Bolts And Nuts

    8 Make sure the main switch (on applica- ble models) is “OFF” before working on the battery. 8 Reversal of the battery leads will dam- age the rectifier. 8 Connect the RED lead first when installing the battery and disconnect 901012 the RED lead last when removing it.

  • Page 108: Cleaning Cooling-Water Passages

    EMU01172 CLEANING COOLING-WATER PASSAGES Flushing device equipped model Perform this procedure right after opera- tion for the most thorough flushing. 1) After shutting off the engine, unscrew the garden-hose connector 2 from the fitting 1 on the bottom cowling. 2) Screw the garden-hose connector 2 onto a garden hose 3 which is con- nected to a fresh-water supply.

  • Page 109: Motor Exterior

    Check the motor for scratches, nicks, or flaking paint. Areas with damaged paint are more likely to corrode. If necessary, clean and paint the areas. A touch-up paint is available from a Yamaha dealer. EMU00413 COATING THE BOAT BOTTOM A clean hull improves boat performance.
  • Page 110 -MEMO-...

  • Page 111: Trouble Recovery

    EMU00414 Chapter 5 TROUBLE RECOVERY TROUBLESHOOTING ......5-1 TEMPORARY ACTION IN EMERGENCY ..........5-5 Impact damage........5-5 Power trim/tilt will not operate ...5-5 Starter will not operate ......5-6 Engine fails to operate ......5-8 Treatment of submerged motor ..5-9...

  • Page 112: Troubleshooting

    A problem in the fuel, compression, or ignition systems can cause poor starting, loss of power, or other problems. The troubleshooting chart describes basic checks and possi- ble remedies. (This chart covers all Yamaha outboard motors. Therefore, some items may not apply to your model.) If your outboard motor requires repair, bring it to a Yamaha dealer.
  • Page 113 3. Fill tank with clean, fresh fuel. 4. Fuel filter clogged. 4. Clean or replace filter. 5. Failed ignition parts. 5. Have serviced by a Yamaha dealer. 6. Warning system activated. 6. Find and correct cause of warning. 7. Spark plug gap incorrect.
  • Page 114 5. Engine oil contaminated or 5. Replace oil with fresh, specified sounds or deteriorated. type. indicator lamp 6. Oil filter clogged. 6. Have serviced by a Yamaha lights. dealer. 7. Oil feed/injection pump 7. Have serviced by a Yamaha malfunctions. dealer.
  • Page 115 13. Check wires for wear or breaks. ignition wiring. Tighten all loose connections. Replace worn or broken wires. 14. Failed ignition parts. 14. Have serviced by a Yamaha dealer. 15. Specified engine oil not used. 15. Check and replace oil with specified type.

  • Page 116: Temporary Action In Emergency

    607011 3) However damage is found or not found, go back to a nearest harbor slowly and carefully. 4) Have a Yamaha dealer inspection of the outboard motor, before operating it again. EMU00419 POWER TRIM/TILT WILL NOT OPERATE...

  • Page 117: Starter Will Not Operate

    EMU00423 STARTER WILL NOT OPERATE If the starter mechanism does not operate (engine cannot be cranked with the starter), the engine can be started with an emergency starter rope. 8 Use this procedure only in an emer- gency and only to return to port for repairs.
  • Page 118 EMU00961 Emergency Starting Engine 1) Remove the top cowling. 2) Remove the start-in-gear protection cable 1 from the starter after remov- ing the clip 2 and the screw 3 if the cable is equipped. 3) Remove the starter/flywheel cover after removing 4 bolts. Disconnect the leads for the warning indicator.

  • Page 119: Engine Fails To Operate

    5) Insert the knotted end of the emer- gency starter rope into the notch in the flywheel rotor and wind the rope several turns clockwise. 6) Pull the rope slowly until resistance is felt. 7) Give a strong pull straight out to 208063 crank and start the engine.

  • Page 120: Treatment Of Submerged Motor

    6) Take the outboard motor to a Yamaha dealer as soon as possible. Do not attempt to run the motor until it has been completely inspected.

  • Page 121: Index

    EMU00450 Chapter 6 INDEX INDEX............6-1...
  • Page 122 EMU00451 Disconnecting the battery .....4-32 INDEX Emission control information....1-2 Emergency starting engine.....5-7 Adjusting idling speed ......4-18 Engine fails to operate......5-8 Adjusting trim angle......3-19 Engine oil ..........1-13 Air vent screw...........2-2 Engine stop button ........2-5 Engine stop lanyard switch ....2-5,2-8 Basic boating rules ........1-7 Exhaust leakage ........4-22 Battery care..........4-9 Battery requirement ......1-14...

  • Page 123: Propeller Selection

    Lubrication..........4-8 Steering friction adjusting lever...2-10 Stopping engine........3-17 Main components........2-1 Storing outboard motor ......4-5 Main switch ..........2-7 Tachometer ..........2-14 Maintenance chart .........4-11 Temporary action in emergency....5-5 Motor exterior ........4-34 Mounting height ........3-3 Throttle control grip.........2-4 Mounting the outboard motor ....3-2 Throttle friction adjusting knob....2-4 Throttle friction adjusting screw ...2-9 Neutral interlock trigger ......2-6 Throttle indicator ........2-4...
  • Page 124 1. Be sure your new Yamaha is registered for warranty. Your boat dealer should do this at the time of sale. Make sure your dealer gives you a copy of the completed Yamaha regis- tration card for your records.
  • Page 125 5. Your warranty applies specifically to repairs made in the country of purchase. If your U.S.-purchased Yamaha needs warranty service while in Canada, or your Canadian pur- chased Yamaha needs service while in the United States, Yamaha will assist the local dealer whenever possible. However, some products available in one country may not be sold or serviced in the other.
  • Page 126 Yamaha Motor Corporation, U.S.A. hereby warrants that new Yamaha 1999-or-later model four-stroke outboard motors originally dis- tributed by Yamaha Motor Corporation, U.S.A. will be free from defects in material and workmanship for the period of time stated here- in, subject to certain stated limitations. Warranty coverage for outboards distributed by non-US Yamaha affiliated companies may be different.
  • Page 127 Charges for removal of the motor from a boat and transporting the motor to and from an authorized Yamaha Outboard Motor Dealer are excluded from warranty coverage.
  • Page 128 The federal government requires each manufacturer of a motor vehicle to maintain a complete, up-to-date list of all first purchasers against the possibility of a safety-related defect and recall. This list is complied from the purchase registrations sent to Yamaha Motor Corporation, U.S.A.
  • Page 129 Yamaha outside the U.S.A. or Canada, please contact an autho- rized Yamaha dealer in your country. Keep a copy of your sales contract or invoice for the purchase of your Yamaha and present it if you need warranty repairs. This document should show the date of purchase, which is important evidence the repairing dealer will need to be sure your Yamaha is covered by warranty.
  • Page 132 Printed in Japan 0.1 ! April 2001—0.5 65W-28199-15 (F25AMH/F25AEH/F25AE/F25AET/FT25BET) Printed on recycled paper...

This manual is also suitable for:

T25a

Table of Contents