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  4. 25B
  5. Owner's Manual

Yamaha 25B Owner's Manual

Summary of 25B

  • Page 1

    Read this manual carefully before operating this outboard motor. Owner’s manual e25b 25b 25x 30h 69r-28199-2a-e0 69r-9-2a-1e0.Book 1 ページ ２０１０年２月３日 水曜日 午後５時１８分.

  • Page 2

    Emu25052 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. 69r-9-2a-1e0.Book 1 ページ ２０１０年２月３日 水曜日 午後５時１８分.

  • Page 3: Important Manual Information

    Important manual information emu25107 to the owner thank you for selecting a yamaha outboard motor. This owner’s manual contains infor- mation needed for proper operation, mainte- nance and care. A thorough understanding of these simple instructions will help you ob- tain maximum enjoyment from your...

  • Page 4: Table of Contents

    Table of contents safety information............................. 1 outboard motor safety ..................... 1 propeller............................................ 1 rotating parts.................................... 1 hot parts ........................................... 1 electric shock..........

  • Page 5: Table of Contents

    Table of contents installation ....................................... 24 installation ...................................... 24 mounting the outboard motor.......... 24 clamping the outboard motor ......... 25 operation ......................................... 27 first-time operation ................

  • Page 6: Table of Contents

    Table of contents emergency starting engine ............. 66 treatment of submerged motor...... 67 69r-9-2a-1e0.Book 3 ページ ２０１０年２月３日 水曜日 午後５時１８分.

  • Page 7: Safety Information

    1 safety information emu33622 outboard motor safety observe these precautions at all times. Emu36501 propeller people can be injured or killed if they come in contact with the propeller. The propeller can keep moving even when the motor is in neutral, and sharp edges of the propeller can cut even wh...

  • Page 8: Safety Information

    Safety information 2 when inhaled. Symptoms include nausea, dizziness, and drowsiness. Keep cockpit and cabin areas well ventilated. Avoid blocking exhaust outlets. Emu33780 modifications do not attempt to modify this outboard mo- tor. Modifications to your outboard motor may reduce safety and relia...

  • Page 9: Safety Information

    Safety information 3 keep a safe distance away from people, ob- jects, and other boats. ● do not follow directly behind other boats or waterskiers. ● avoid sharp turns or other maneuvers that make it hard for others to avoid you or un- derstand where you are going. ● avoid areas with submerged objec...

  • Page 10: General Information

    4 general information emu25171 identification numbers record emu25183 outboard motor serial number the outboard motor serial number is stamped on the label attached to the port side of the clamp bracket. Record your outboard motor serial number in the spaces provided to assist you in ordering spare ...

  • Page 11: General Information

    General information 5 emu25213 c-tick label engines affixed with this label conform to certain portion(s) of the australian radio communications act. 1. Ce marking location 1. C-tick label location 1 zmu04730 zmu06040 1 zmu05721 zmu01697 69r-9-2a-1e0.Book 5 ページ ２０１０年２月３日 水曜日 午後５時１８分.

  • Page 12: General Information

    General information 6 emu33522 read manuals and labels before operating or working on this outboard motor: ● read this manual. ● 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...

  • Page 13: General Information

    General information 7 emu33912 contents of labels the above warning labels mean as follows. 1 warning ewm01691 emergency starting does not have start- in-gear protection. Ensure shift control is in neutral before starting engine. 2 warning ewm01681 ● keep hands, hair, and clothing away from rotating...

  • Page 14: General Information

    General information 8 emu33843 symbols the following symbols mean as follows. Notice/warning read owner’s manual hazard caused by continuous rotation electrical hazard remote control lever/gear shift lever operat- ing direction, dual direction engine start/ engine cranking zmu05696 zmu05664 zmu05665...

  • Page 15: Specifications

    9 specifications and requirements emu31480 specifications tip: “(al)” stated in the specification data below represents the numerical value for the alumi- num propeller installed. Likewise, “(sus)” represents the value for stainless steel propeller installed and “(pl)” for plastic propeller installe...

  • Page 16: Installation Requirements

    Specifications and requirements 10 30hw manual starter and electric starter e25bmh manual starter starting carburetion system: choke valve min. Cold cranking amps (cca/en): 30hw 347.0 a min. Rated capacity (20hr/iec): 30hw 40.0 ah alternator output: 25bmh 80 w 25xmh 80 w 30hmh 80 w e25bmh 80 w maxim...

  • Page 17: Remote Control Requirements

    Specifications and requirements 11 tions such as poor handling, loss of control, or fire hazards. ● because the motor is very heavy, spe- cial equipment and training is required to mount it safely. Your dealer or other person experienced in proper rigging should mount the motor using correct equipme...

  • Page 18: Start-In-Gear Protection

    Specifications and requirements 12 top speed, fuel economy, and even engine life. Yamaha designs and manufactures pro- pellers for every yamaha outboard motor and every application. Your outboard motor came with a yamaha propeller selected to perform well over a range of applications, but there may ...

  • Page 19: Muddy Or Acidic Water

    Specifications and requirements 13 methanol. Ethanol can be used if the ethanol content does not exceed 10% and the fuel meets the minimum octane ratings. All etha- nol blends containing more than 10% etha- nol can cause fuel system damage or cause engine starting and running problems. Yamaha does n...

  • Page 20: Components

    14 components emu2579t components diagram tip: * may not be exactly as shown; also may not be included as standard equipment on all mod- els (order from dealer). E25b, 25b, 25x, 30h emu25802 fuel tank if your model was equipped with a portable fuel tank, its function is as follows. Warning ewm00020 ...

  • Page 21: Components

    Components 15 its dedicated fuel reservoir and must not be used as a fuel storage container. Com- mercial users should conform to relevant licensing or approval authority regula- tions. Emu25830 fuel joint this joint is used to connect the fuel line. Emu25841 fuel gauge this gauge is located on eith...

  • Page 22: Components

    Components 16 emu26201 neutral interlock trigger to shift out of neutral, first pull the neutral in- terlock trigger up. Emu26212 neutral throttle lever to open the throttle without shifting into ei- ther forward or reverse, put the remote con- trol lever in the neutral position and lift the neutral...

  • Page 23: Components

    Components 17 the left or right as necessary. Emu25923 gear shift lever move the gear shift lever forward to engage the forward gear or rearward to engage the reverse gear. Emu25941 throttle grip the throttle grip is on the tiller handle. Turn the grip counterclockwise to increase speed and clockwis...

  • Page 24: Components

    Components 18 or throttle grip, which could result in an accident. [ewm00032] when constant speed is desired, tighten the adjuster to maintain the desired throttle set- ting. Emu25994 engine shut-off cord (lanyard) and clip the clip must be attached to the engine shut- off switch for the engine to r...

  • Page 25: Components

    Components 19 emu26012 choke knob for pull type to supply the engine with the rich fuel mix- ture required to start, pull out this knob. Emu26073 manual starter handle the manual starter handle is used to crank and start the engine. Emu26091 main switch the main switch controls the ignition system; ...

  • Page 26: Components

    Components 20 to increase resistance, turn the adjuster clockwise. To decrease resistance, turn the adjuster counterclockwise. Warning ewm00040 do not overtighten the friction adjuster. If there is too much resistance, it could be difficult to steer, which could result in an accident. Emu26253 trim ...

  • Page 27: Components

    Components 21 emu30530 tilt lock mechanism the tilt lock mechanism is used to prevent the outboard motor from lifting out of the wa- ter when in reverse gear. To lock it, set the tilt lock lever in the lock po- sition. To release, push the tilt lock lever in the release position. Emu26321 tilt suppo...

  • Page 28: Components

    Components 22 emu26410 2-pin connector ac 12 v-40/60/80w power is delivered through this connector. When using it, keep in mind the following points: ● use a genuine yamaha connector. ● use lighting equipment only. ● connect lighting equipment directly to the 2-pin connector. ● capacity of the light...

  • Page 29: Engine Control System

    23 engine control system emu26803 alert system notice ecm00091 do not continue to operate the engine if a alert device has activated. Consult your yamaha dealer if the problem cannot be located and corrected. Emu2681c overheat alert this engine has an overheat-alert device. If the engine temperature...

  • Page 30: Installation

    24 installation emu26902 installation the information presented in this section is intended as reference only. It is not possible to provide complete instructions for every possible boat and motor combination. Proper mounting depends in part on experience and the specific boat and motor combination....

  • Page 31: Installation

    Installation 25 notice ecm01634 ● make sure that the idle hole is high enough to prevent water from entering the engine even if the boat is stationary with the maximum load. ● incorrect engine height or obstructions to the smooth flow of water (such as the design or condition of the boat, or ac- ces...

  • Page 32: Installation

    Installation 26 packaging. 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. [ewm00651] 1. Bolts 1 zmu02014 69r-9-2a-1e0.Book 26 ページ ２０１０年２月３日 水曜日 午後５時１８分.

  • Page 33: Operation

    27 operation emu36381 first-time operation emu30174 breaking in engine your new engine requires a period of break- in to allow mating surfaces of moving parts to wear in evenly. Correct break-in will help en- sure proper performance and longer engine life. Notice: failure to follow the break-in proc...

  • Page 34: Operation

    Operation 28 emu37141 fuel level be sure you have plenty of fuel for your trip. A good rule is to use 1/3 of your fuel to get to the destination, 1/3 to return, and to keep 1/3 as an emergency reserve. With the boat lev- el on a trailer or in the water, check the fuel level. For fuel filling instruc...

  • Page 35: Operation

    Operation 29 ● 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 sh...

  • Page 36: Operation

    Operation 30 emu36582 battery check that the battery is in good condition, and fully charged. Check that the battery connections are clean, secure and covered by insulating covers. The electrical contacts of the battery and cables must be clean and properly connected or the battery will not start th...

  • Page 37: Operation

    Operation 31 temperature increases. [ewm02610] 9. Tighten the filler cap securely. 10. Wipe up any spilled gasoline immediate- ly with dry rags. Dispose rags properly according to local laws or regulations. Emu27406 gasoline and oil mixing (100:1) notice ecm00811 ● avoid using any oil other than the...

  • Page 38: Operation

    Operation 32 3. Shake the fuel tank to mix the fuel thor- oughly. 4. Make sure that the oil and gasoline are mixed. If equipped with a built-in fuel tank 1. Pour oil into a clean fuel can, and then add gasoline. 2. Replace the fuel can cap and close tight- ly. 3. Shake the fuel can to mix the fuel t...

  • Page 39: Operation

    Operation 33 tip: wipe up any spilled gasoline immediately with dry rags. Dispose rags properly accord- ing to local laws or regulations. 3. Squeeze the primer pump, with the ar- row pointing up, until you feel it become firm. During engine operation place the tank horizontally, otherwise fuel canno...

  • Page 40: Operation

    Operation 34 3. Place the throttle grip in the “ ” (start) position. 4. Pull out / turn the choke knob fully. After the engine starts, replace / return the knob to the home position. Tip: ● it is not necessary to use the choke when starting a warm engine. ● if the choke knob is left in the “ ” (star...

  • Page 41: Operation

    Operation 35 emu27636 manual start models (remote control) warning ewm01840 ● failure to attached engine shut-off cord could result in a runaway boat if opera- tor is ejected. Attach the engine shut- off cord to a secure place on your cloth- ing, or your arm or leg while operating. Do not attach the...

  • Page 42: Operation

    Operation 36 tip: ● it is not necessary to use the choke when starting a warm engine. ● if the choke knob is left in the “ ” (start) position while the engine is running, the engine will run poorly or stall. 5. Pull the manual starter handle slowly un- til you feel resistance. Then give a strong pul...

  • Page 43: Operation

    Operation 37 or leg. Then install the clip on the other end of the cord into the engine shut-off switch. 3. Turn the main switch to “ ” (on). 4. Open the throttle slightly without shifting using the neutral throttle lever or free ac- celerator. You may need to change the throttle opening slightly de...

  • Page 44: Operation

    Operation 38 7. Immediately after the engine starts, re- lease the main switch and allow it to re- turn to “ ” (on). Notice: never turn the main switch to “ ” (start) while the engine is running. Do not keep the starter motor turning for more than 5 seconds. If the starter motor is turned continuous...

  • Page 45: Operation

    Operation 39 swimmers or obstacles in the water near you. Notice ecm01610 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...

  • Page 46: Operation

    Operation 40 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. Emu31742 stopping boat warning ewm01510 ● do not use the reverse function to slow down or stop the boat as it could cause you to lose control, be...

  • Page 47: Operation

    Operation 41 2. After stopping the engine, disconnect the fuel line if 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 r...

  • Page 48: Operation

    Operation 42 emu27872 adjusting trim angle for manual tilt models there are 4 or 5 holes provided in the clamp bracket to adjust the outboard motor trim an- gle. 1. Stop the engine. 2. Tilt the outboard motor up, and then re- move the trim rod from the clamp brack- et. 3. Reposition the rod in the d...

  • Page 49: Operation

    Operation 43 bow up, the boat may have a greater tenden- cy to steer to one side or the other. Compen- sate for this as you steer. When the bow of the boat is down, it is easier to accelerate from a standing start onto plane. Bow up too much trim-out puts the bow of the boat too high in the water. P...

  • Page 50: Operation

    Operation 44 notice ecm00241 ● before tilting the outboard motor, stop the engine by following the procedure on page 40. 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) beca...

  • Page 51: Operation

    Operation 45 emu28013 procedure for tilting down (manual tilt models) 1. Slightly tilt the engine up. 2. On models equipped with a tilt support knob, pull it out. 3. Slowly tilt the engine down. Emu28061 shallow water emu28073 cruising in shallow water (manual tilt models) warning ewm01781 ● run the...

  • Page 52: Operation

    Operation 46 2. Push the tilt lock lever down to the re- lease position. 3. Slightly tilt the outboard motor up and pull the shallow water lever toward the transom. 4. To return the outboard motor to the nor- mal position, place the remote control le- ver / gear shift lever in neutral, then slightly...

  • Page 53: Maintenance

    47 maintenance emu2822a transporting and storing outboard motor warning ewm02620 ● use care when transporting fuel tank, whether in a boat or car. ● do not fill fuel container to maximum capacity. Gasoline will expand consid- erably as it warms up and can build up pressure in the fuel container. Thi...

  • Page 54: Maintenance

    Maintenance 48 tip: place a towel or something similar under the outboard motor to protect it from damage. Emu30272 storing outboard motor when storing your yamaha outboard motor for prolonged periods of time (2 months or longer), several important procedures must be performed to prevent excessive d...

  • Page 55: Maintenance

    Maintenance 49 properly done, the engine will smoke ex- cessively and almost stall. 8. Remove the outboard motor from the test tank. 9. Install the silencer cover/cap of fogging hole and top cowling. 10. If the “fogging oil” is not available, run the engine at a fast idle until the fuel sys- tem bec...

  • Page 56: Maintenance

    Maintenance 50 dling hot parts or fluids. ● always completely reassemble the mo- tor before operation. Emu28511 replacement parts if replacement parts are necessary, use only genuine yamaha parts or parts of equivalent design and quality. Any part of inferior quality may malfunction, and the resulti...

  • Page 57: Maintenance

    Maintenance 51 emu34446 maintenance chart 1 tip: ● refer to the sections in this chapter for explanations of each owner-specific action. ● the maintenance cycle on these charts assume usage of 100 hours per year and regular flushing of the cooling water passages. Maintenance frequency should be adju...

  • Page 58: Maintenance

    Maintenance 52 fuel line (high pres- sure) inspection or replace- ment as necessary fuel line (low pres- sure) inspection fuel line (low pres- sure) inspection or replace- ment as necessary fuel pump inspection or replace- ment as necessary fuel/engine oil leakage inspection gear oil replacement gre...

  • Page 59: Maintenance

    Maintenance 53 emu34451 maintenance chart 2 item actions every 1000 hours exhaust guide/exhaust manifold inspection or replace- ment as necessary 69r-9-2a-1e0.Book 53 ページ ２０１０年２月３日 水曜日 午後５時１８分.

  • Page 60: Maintenance

    Maintenance 54 emu28943 greasing yamaha grease a (water resistant grease) yamaha grease d (corrosion resistant grease; for propeller shaft) e25b, 25b, 25x, 30h emu28957 cleaning and adjusting spark plug the spark plug is an important engine com- ponent and is easy to inspect. The condition of the sp...

  • Page 61: Maintenance

    Maintenance 55 move and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode. 1. Remove the spark plug caps from the spark plugs. 2. Remove the spark plug. If electrode ero- sion becomes excessive, or if carbon and other deposits are excessive, yo...

  • Page 62: Maintenance

    Maintenance 56 from the flywheel and other rotating parts while the engine is running. Notice ecm00490 this procedure must be performed while the outboard motor is in the water. A flushing attachment or test tank can be used. If the boat is not equipped with a tachometer for the outboard motor, use ...

  • Page 63: Maintenance

    Maintenance 57 ● check the propeller shaft oil seal for dam- age. Emu30662 removing propeller emu29197 spline models 1. Straighten the cotter pin and pull it out using a pair of pliers. 2. Remove the propeller nut, washer, and spacer (if equipped). Warning! Do not use your hand to hold the propel- l...

  • Page 64: Maintenance

    Maintenance 58 tip: if the propeller nut does not align with the propeller shaft hole after tightening to the specified torque, tighten the nut further to align it with the hole. Emu29289 changing gear oil warning ewm00800 ● be sure the outboard motor is securely fastened to the transom or a stable ...

  • Page 65: Maintenance

    Maintenance 59 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. 7. Put a new gasket on the gear oil drain screw. Insert and tighten the gear oil drain screw. Emu29302 cleaning fuel tank warning ewm00920 gaso...

  • Page 66: Maintenance

    Maintenance 60 them ineffective. Tip: inspect ground leads attached to external anodes on equipped models. Consult a yamaha dealer for inspection and replace- ment of internal anodes attached to the pow- er unit. Emu29323 checking battery (for electric start models) warning ewm01902 battery electrol...

  • Page 67: Maintenance

    Maintenance 61 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. Emu29371 disconnecting the battery 1. Turn off the battery cut-off switch (if equipped) a...

  • Page 68: Trouble Recovery

    62 trouble recovery emu29427 troubleshooting a problem in the fuel, compression, or igni- tion systems can cause poor starting, loss of power, or other problems. This section de- scribes basic checks and possible remedies, and covers all yamaha outboard motors. Therefore some items may not apply to ...

  • Page 69: Trouble Recovery

    Trouble recovery 63 q. Is fuel system obstructed? A. Check for pinched or kinked fuel line or other obstructions in fuel system. Q. Is fuel contaminated or stale? A. Fill tank with clean, fresh fuel. Q. Is fuel filter clogged? A. Clean or replace filter. Q. Have ignition parts failed? A. Have servic...

  • Page 70: Trouble Recovery

    Trouble recovery 64 q. Is load on boat improperly distributed? A. Distribute load to place boat on an even plane. Q. Is water pump or thermostat faulty? A. Have serviced by a yamaha dealer. Q. Is there excess water in fuel filter cup? A. Drain filter cup. Engine power loss. Q. Is propeller damaged? ...

  • Page 71: Trouble Recovery

    Trouble recovery 65 q. Is fuel joint connection incorrect? A. Connect correctly. Q. Is heat range of spark plug incorrect? A. Inspect spark plug and replace it with rec- ommended type. Q. Is high pressure fuel pump drive belt bro- ken? A. Have serviced by a yamaha dealer. Q. Is engine not responding...

  • Page 72: Trouble Recovery

    Trouble recovery 66 consult your yamaha dealer if the new fuse immediately blows again. Emu29533 starter will not operate if the starter mechanism does not operate (the engine cannot be cranked with the start- er), the engine can be started with an emer- gency starter rope. Warning ewm01022 ● use th...

  • Page 73: Trouble Recovery

    Trouble recovery 67 3. Remove the starter/flywheel cover after removing the bolt(s). 4. Prepare the engine for starting. For fur- ther information, see page 33. Be sure the engine is in neutral and that the clip is attached to the engine shut-off switch. The main switch must be “ ” (on), if equipped...

  • Page 74

    Yamaha motor co., ltd. Printed on recycled paper printed in japan march 2010–0.2  1 ! 69r-9-2a-1e0.Book 1 ページ ２０１０年２月３日 水曜日 午後５時１８分.