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Yamaha F25A Owner's Manual

Summary of F25A

  • Page 1

    Read this manual carefully before operating this outboard motor. Owner’s manual f2.5a f4b f5a f6c 6bv-f8199-23-e0 u6bv23e0.Book page 1 tuesday, april 5, 2011 2:38 pm.

  • 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. U6bv23e0.Book page 1 tuesday, april 5, 2011 2:38 pm.

  • Page 3

    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 obtain maximum enjoyment from your n...

  • 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 operation ......................................... 35 first-time operation ....................... 35 fill engine oil .................................... 35 breaking in engine............................ 35 getting to know your boat ................ 35 checks before starting engi...

  • Page 6: 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 neu- tral, and sharp edges of the propeller can cut even ...

  • Page 7: Safety Information

    Safety information 2 emu33780 modifications do not attempt to modify this outboard motor. Modifications to your outboard motor may re- duce safety and reliability, and render the out- board unsafe or illegal to use. Emu33740 boating safety this section includes a few of the many im- portant safety p...

  • Page 8: Safety Information

    Safety information 3 ● 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 objects or shallow water. ● ride within your limits and avoid aggressive maneuvers to reduce the risk of loss of con- trol, ejection...

  • Page 9: General Information

    General information 4 emu25171 identification numbers record emu25184 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 10: General Information

    General information 5 emu25214 c-tick label engines affixed with this label conform to cer- tain portion(s) of the australian radio com- munications act. F2.5a f4b, f5a, f6c 1. C-tick label location 1. C-tick label location zmu06304 zmu06712 1 zmu01697 u6bv23e0.Book page 5 tuesday, april 5, 2011 2:3...

  • Page 11: General Information

    General information 6 emu33523 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 12: General Information

    General information 7 emu33922 contents of labels the above warning labels mean as follows. 1 warning ewm01701 gasoline is highly flammable and explo- sive. Shut off engine before refueling. Tighten tank cap and air vent screw when not in use. 2 warning ewm01681 ● keep hands, hair, and clothing away...

  • Page 13: General Information

    General information 8 emu35132 symbols the following symbols mean as follows. Notice/warning read owner’s manual hazard caused by continuous rotation electrical hazard zmu05696 zmu05664 zmu05665 zmu05666 u6bv23e0.Book page 8 tuesday, april 5, 2011 2:38 pm.

  • Page 14: General Information

    General information 9 emu42710 warning labels if these labels are damaged or missing, contact your yamaha dealer for replacements. F4b, f5a, f6c 4 3 1 2 zmu06795 u6bv23e0.Book page 9 tuesday, april 5, 2011 2:38 pm.

  • Page 15: General Information

    General information 10 emu42760 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 rotatin...

  • Page 16: General Information

    General information 11 4 warning ewm01701 gasoline is highly flammable and explo- sive. Shut off engine before refueling. Tighten tank cap and air vent screw when not in use. Emu42750 symbols the following symbols mean as follows. Notice/warning read owner’s manual hazard caused by continuous rotati...

  • Page 17

    Specifications and requirements 12 emu38091 specifications tip: “(al)” stated in the specification data below represents the numerical value for the alumi- num propeller installed. Emu2821k dimension: overall length: f2.5amh 623 mm (24.5 in) f4bmh 750 mm (29.5 in) f5amh 750 mm (29.5 in) f6cmh 750 mm...

  • Page 18

    Specifications and requirements 13 ignition system: f2.5amh tci f4bmh cdi f5amh cdi f6cmh cdi spark plug (ngk): f2.5amh br6hs f4bmh cr6hsb f5amh cr6hsb f6cmh cr6hsb spark plug gap: 0.6–0.7 mm (0.024–0.028 in) control system: tiller handle starting system: manual starter starting carburetion system: ...

  • Page 19

    Specifications and requirements 14 tightening torque for engine: spark plug: f2.5amh 25.0 nm (2.55 kgf-m, 18.4 ft-lb) f4bmh 13.0 nm (1.33 kgf-m, 9.6 ft-lb) f5amh 13.0 nm (1.33 kgf-m, 9.6 ft-lb) f6cmh 13.0 nm (1.33 kgf-m, 9.6 ft-lb) engine oil drain bolt: 18.0 nm (1.84 kgf-m, 13.3 ft-lb) noise and vi...

  • Page 20

    Specifications and requirements 15 load. Generally, select a larger pitch propeller for a smaller operating load and a smaller pitch propeller for a heavier load. If you carry loads that vary widely, select the propeller that lets the engine run in the proper range for your maximum load but remember...

  • Page 21

    Specifications and requirements 16 recommended engine oil grade 1 recommended engine oil grade 2 emu36360 fuel requirements emu40210 gasoline use a good quality gasoline that meets the minimum octane rating. If knocking or pinging occurs, use a different brand of gasoline or premium unleaded fuel. Y...

  • Page 22

    Specifications and requirements 17 emu36352 emergency equipment keep the following items onboard in case there is trouble with the outboard motor. ● a tool kit with assorted screwdrivers, pliers, wrenches (including metric sizes), and electrical tape. ● waterproof flashlight with extra batteries. ● ...

  • Page 23: Components

    Components 18 emu2579y components diagram tip: * may not be exactly as shown; also may not be included as standard equipment on all models (order from dealer). F2.5a 1. Top cowling 2. Cowling lock lever(s) 3. Carrying handle 4. Steering friction adjuster 5. Anti-cavitation plate 6. Propeller 7. Cool...

  • Page 24: Components

    Components 19 f4b, f5a, f6c emu39543 fuel tank (built-in fuel tank) this outboard motor is equipped with a built- in fuel tank and its parts are as follows. Fuel tank cap this cap seals the fuel tank. When removed, the tank can be filled with fuel. To remove the cap, turn it counterclockwise. Air ve...

  • Page 25: Components

    Components 20 f2.5a f4b, f5a, f6c emu43582 fuel tank (portable fuel tank) (f4b, f5a, f6c) this model can be equipped with an optional portable fuel tank. The type of portable fuel tank that the out- board motor can use is different depending on the shape of the fuel joint on the outboard mo- tor. If...

  • Page 26: Components

    Components 21 fuel joint this joint is used to connect the fuel line. Fuel gauge this gauge is located on either the fuel tank cap or on the fuel joint base. It shows the ap- proximate amount of fuel remaining in the tank. If the outboard motor is equipped with the fuel joint “b”, the outboard motor...

  • Page 27: Components

    Components 22 f4b, f5a, f6c the fuel cock turns on and off the supply of fuel from the fuel tank to the engine. The fuel cock has 3 positions: the closed po- sition, built-in fuel tank position, and portable fuel tank position. Depending on how the out- board motor will be used, align the fuel cock ...

  • Page 28: Components

    Components 23 f4b, f5a, f6c to send fuel from the fuel tank to the carbure- tor, align the fuel cock with the position for the built-in fuel tank or portable fuel tank accord- ing to which fuel tank is being used. When using the built-in fuel tank, align the fuel cock with the built-in fuel tank pos...

  • Page 29: Components

    Components 24 f4b, f5a, f6c move the gear shift lever forward to engage the forward gear or rearward to engage the reverse gear. Emu25942 throttle grip the throttle grip is on the tiller handle. Turn the grip counterclockwise to increase speed and clockwise to decrease speed. F2.5a f4b, f5a, f6c emu...

  • Page 30: Components

    Components 25 emu39243 throttle friction adjuster the throttle friction adjuster provides adjust- able resistance when the throttle grip is turned, and can be set according to operator preference. To increase resistance, turn the throttle fric- tion adjuster clockwise. To decrease resistance, turn t...

  • Page 31: Components

    Components 26 f2.5a f4b, f5a, f6c emu26003 engine stop button the engine stop button stops the engine when the button is pushed. F2.5a f4b, f5a, f6c emu26013 choke knob for pull type to supply the engine with the rich fuel mixture required to start, pull out this knob. F2.5a 1. Clip 2. Cord 3. Engin...

  • Page 32: Components

    Components 27 f4b, f5a, f6c emu39723 fuel joint cap (f4b, f5a, f6c) the fuel joint is equipped with the fuel joint cap. Warning! When not using a portable fuel tank, make sure to install the fuel joint cap. Otherwise, injury could result from striking the fuel joint accidentally. [ewm02411] emu26074...

  • Page 33: Components

    Components 28 f2.5a f4b, f5a, f6c to increase resistance, turn the steering fric- tion adjuster clockwise. To decrease resistance, turn the steering fric- tion adjuster counterclockwise. Emu40101 trim rod (tilt pin) the trim rod (tilt pin) is used to adjust the trim angle of the outboard motor in re...

  • Page 34: Components

    Components 29 when the gear shift lever is moved to the neu- tral position or forward position, the outboard motor can be tilted up. Emu39832 tilt support bar (f4b, f5a, f6c) use the tilt support bar to keep the outboard motor in the tilted up position or a shallow wa- ter cruising position. Emu4260...

  • Page 35: Components

    Components 30 f2.5a f2.5a f4b, f5a, f6c emu42850 carrying handle f2.5a a carrying handle is provided on the rear of the outboard motor. It enables you to carry the outboard motor easily with one hand. F4b, f5a, f6c the carrying handle is used to carry the out- board motor. For information on carryin...

  • Page 36: Installation

    Installation 31 emu39731 installation the information presented in this section is in- tended as reference only. It is not possible to provide complete instructions for every possi- ble boat and motor combination. Proper mounting depends in part on experience and the specific boat and motor combinat...

  • Page 37: Installation

    Installation 32 4. Hold the carrying handle and the hand- grip on the front side of the bottom cowl- ing and lift up the outboard motor using two people. 5. Mount the outboard motor on the center line (keel line) of the boat, and ensure that the boat itself is well balanced. Oth- erwise the boat wil...

  • Page 38: Installation

    Installation 33 the mounting height is too high, cavitation tends to occur, thus reducing the propulsion; and if the propeller tips cut the air, the engine speed will rise abnormally and cause the en- gine to overheat. If the mounting height is too low, the water resistance will increase and thereby...

  • Page 39: Installation

    Installation 34 2. Attach one end to the restraint cable at- tachment and the other to a secure mounting point on the boat. Otherwise the engine could be completely lost if it accidentally falls off the transom. F2.5a f4b, f5a, f6c 1. Clamp screw 1. Restraint cable attachment 1. Restraint cable atta...

  • Page 40: Operation

    Operation 35 emu36381 first-time operation emu36391 fill engine oil the engine is shipped from the factory without engine oil. If your dealer did not fill the oil, you must fill it before starting the engine. Notice: check that the engine is filled with oil be- fore first-time operation to avoid sev...

  • Page 41: Operation

    Operation 36 emu43710 remove the top cowling for the following checks, remove the top cowling from the bottom cowling. To remove the top cowling, pull the cowling lock lever(s) up and lift up the top cowling. F2.5a f2.5a f4b, f5a, f6c emu36442 fuel system warning ewm00060 gasoline and its vapors are...

  • Page 42: Operation

    Operation 37 ● check the throttle cable and throttle link for loose or damaged connections. ● check the shift link and start-in-gear protec- tion cable for loose or damaged connec- tions. Emu36483 engine shut-off cord (lanyard) inspect the engine shut-off cord and clip for damage, such as cuts, brea...

  • Page 43: Operation

    Operation 38 f4b, f5a, f6c 1. Place the outboard motor in an upright position (not tilted). Notice: if the mo- tor is not level, the oil level indicated on the dipstick may not be accurate. [ecm01790] 2. Remove the oil filler cap and wipe the at- tached oil dipstick clean. Tip: the oil lubrication c...

  • Page 44: Operation

    Operation 39 after installing, check the fitting of the top cowling by pushing it with both hands. If the top cowling is loose, have it repaired by your yamaha dealer. F4b, f5a, f6c 1. Check the rubber seal for damage. If the rubber seal is damaged, have it replaced by a yamaha dealer. 2. Align the ...

  • Page 45: Operation

    Operation 40 6. Check the fitting of the top cowling by pushing it with both hands. Notice: if the top cowling is not installed cor- rectly, water spray under the top cowl- ing can damage the engine, or the top cowling can blow off at high speeds. [ecm01991] emu43591 filling fuel warning ewm01950 be...

  • Page 46: Operation

    Operation 41 3. Tighten the fuel tank cap securely. 4. Wipe up any spilled gasoline immediately with dry rags. Dispose of rags properly according to local laws or regulations. If you use a portable container to store and dispense fuel, only use a locally ap- proved gasoline container. Filling fuel f...

  • Page 47: Operation

    Operation 42 5. Tighten the fuel tank cap securely. 6. Wipe up any spilled gasoline immediately with dry rags. Dispose of rags properly according to local laws or regulations. If you use a portable container to store and dispense fuel, only use a locally ap- proved gasoline container. Filling fuel f...

  • Page 48: Operation

    Operation 43 5. While pressing and holding the pressure relief tab under the fuel tank cap, slowly turn the fuel tank cap counterclockwise 1/4 turn. Tip: release the fuel vapor contained in the fuel tank. 6. While pressing and holding the pressure relief tab under the fuel tank cap again, turn the f...

  • Page 49: Operation

    Operation 44 emu27452 operating engine warning ewm00420 ● 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 water near you. ● when the air vent screw is loosened, gasoline vapor will be release...

  • Page 50: Operation

    Operation 45 3. Remove the top cowling, and then squeeze the primer pump in the bottom cowling repeatedly until you feel it be- come slightly firm. 4. Install the top cowling. Sending fuel for portable fuel tank (optional) (f4b, f5a, f6c) when using the portable fuel tank “a”, send fuel to the outbo...

  • Page 51: Operation

    Operation 46 curely between the tank and the outboard motor while pinching the joint so that the primer pump arrow is pointing toward the outboard motor. 4. Align the fuel cock with the portable fuel tank position. 5. Send fuel to the carburetor by squeezing the primer pump repeatedly, with the ar- ...

  • Page 52: Operation

    Operation 47 2. If there is fuel in the built-in fuel tank, loos- en the air vent screw by 1 or 2 turns to prevent pressure from increasing inside the tank due to fuel expansion. 3. Remove the fuel joint cap on the out- board motor. 4. Check the direction of the fuel hose. Make sure that the arrow o...

  • Page 53: Operation

    Operation 48 7. Align the groove in the fuel joint on the fuel tank with the protrusions on the fuel hose. 8. Push in the fuel hose and turn it clockwise to connect it securely. 9. Wipe up any spilled gasoline immediately with dry rags. Tip: dispose of rags properly according to local laws or regula...

  • Page 54: Operation

    Operation 49 emu27494 starting engine warning ewm01600 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 water near you. Emu42880 manual start warning ewm01840 ● failure to attached engine shut...

  • Page 55: Operation

    Operation 50 4. Place the choke knob in the “ ” (start) position. After the engine starts, re- turn the knob to the “ ” (run) position. Tip: ● when restarting a warm engine, place the choke knob in the “ ” (run) position. ● if the choke knob is left in the “ ” (start) position while the engine is ru...

  • Page 56: Operation

    Operation 51 2. Attach the engine shut-off cord to a se- cure place on your clothing, or your arm or leg. Then, install the clip on the other end of the cord to the engine shut-off switch. 3. Align the engine start mark “ ” on the throttle grip with the notch in the tiller han- dle. Tip: if the ambi...

  • Page 57: Operation

    Operation 52 6. After the engine starts, slowly return the manual starter handle to its original posi- tion before releasing it. 7. Warm up the engine. For further informa- tion, see page 52. 8. Return the choke knob to its original posi- tion gradually. 9. Slowly return the throttle grip to the ful...

  • Page 58: Operation

    Operation 53 or less. After the engine has warmed up, push the choke knob in fully. Failure to do so will shorten engine life. Tip: ● if the choke knob is left pulled out after the engine starts, the engine will stall. ● in temperatures of -5°c or less, leave the choke knob pulled out fully for appr...

  • Page 59: Operation

    Operation 54 to shift from in gear to neutral 1. Close the throttle so that the engine slows to idle speed. 2. After the engine is at idle speed in gear move the gear shift lever firmly and crisp- ly into the neutral position. F4b, f5a, f6c to shift to forward or reverse move the gear shift lever to...

  • Page 60: Operation

    Operation 55 emu39882 stopping boat (f4b, f5a, f6c) warning ewm02321 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 load or other parts of the boat. This could increase the risk of serious injury. It could also damage th...

  • Page 61: Operation

    Operation 56 2. Tighten the air vent screw on the fuel tank cap. 3. Align the fuel cock with the closed posi- tion. Procedure for stopping engine when using optional portable fuel tank (f4b, f5a, f6c) when using the portable fuel tank “a”, stop the engine according to the following proce- dure. 1. P...

  • Page 62: Operation

    Operation 57 2. Tighten the air vent screw on the fuel tank cap. 3. Align the fuel cock with the closed posi- tion. 4. Disconnect the fuel hose, and then install the fuel joint cap. Warning! When not using a portable fuel tank, make sure to install the fuel joint cap. Otherwise, injury could result ...

  • Page 63: Operation

    Operation 58 procedure for stopping engine when using optional portable fuel tank (f4b, f5a, f6c) when using the portable fuel tank “b”, stop the engine according to the following proce- dure. 1. Push and hold the engine stop button un- til the engine stops completely. The en- gine can also be stopp...

  • Page 64: Operation

    Operation 59 4. Disconnect the fuel hose from the fuel joint on the fuel tank by turning it counter- clockwise. 5. Tighten the air vent screw by turning it clockwise. 6. Align the fuel cock with the closed posi- tion. Emu40111 trimming outboard motor warning ewm00740 excessive trim for the operating...

  • Page 65: Operation

    Operation 60 f2.5a f4b, f5a, f6c emu42830 adjusting trim angle for manual tilt models warning ewm00400 ● stop the engine before adjusting the trim angle. ● use care to avoid being pinched when removing or installing the rod. ● use caution when trying a trim position for the first time. Increase spee...

  • Page 66: Operation

    Operation 61 f2.5a f4b, f5a, f6c 3. Change the position of the trim rod in di- rection “a” to raise the bow (“trim-out”). Change the position of the trim rod in di- rection “b” to lower the bow (“trim-in”). Tip: the outboard motor trim angle changes ap- proximately 4 degrees when the trim rod posi- ...

  • Page 67: Operation

    Operation 62 emu27923 tilting up and down if the engine will be stopped for some time or if the boat is moored in shallows, the outboard motor should be tilted up to protect the propel- ler and lower casing from damage by collision with obstructions, and also to reduce salt cor- rosion. Warning ewm0...

  • Page 68: Operation

    Operation 63 2. Tighten the steering friction adjuster by turning it clockwise to prevent the motor from turning freely. 3. Tighten the air vent screw. 4. Close the fuel cock. 5. Hold the carrying handle and tilt the en- gine up fully until the tilt support lever au- tomatically locks. Tip: if the m...

  • Page 69: Operation

    Operation 64 4. Tighten the air vent screw. 5. Hold the rear of the top cowling and fully tilt the outboard motor up. Slightly lower the outboard motor from the fully tilted up position and fit the tilt support bar secure- ly into the holder located on the clamp bracket. Procedure for tilting up whe...

  • Page 70: Operation

    Operation 65 3. To prevent steering movement, turn the steering friction adjuster clockwise. 4. Tighten the air vent screw. 5. Disconnect the fuel hose, and then install the fuel joint cap. Warning! When not using a portable fuel tank, make sure to install the fuel joint cap. Otherwise, injury could...

  • Page 71: Operation

    Operation 66 1. Align the fuel cock with the closed posi- tion. 2. Move the gear shift lever to the neutral position. 3. To prevent steering movement, turn the steering friction adjuster clockwise. 4. Tighten the air vent screw. 5. Disconnect the fuel hose from the fuel joint on the outboard motor b...

  • Page 72: Operation

    Operation 67 7. Hold the rear of the top cowling and fully tilt the outboard motor up. Slightly lower the outboard motor from the fully tilted up position and fit the tilt support bar secure- ly into the holder located on the clamp bracket. Emu42950 procedure for tilting down f2.5a 1. Slightly tilt ...

  • Page 73: Operation

    Operation 68 emu28062 shallow water (f4b, f5a, f6c) emu39891 cruising in shallow water warning ewm02391 ● operate the boat at the lowest possible speed when cruising in shallow water. Hitting an underwater obstacle could cause the outboard motor to lift out of the water, resulting in loss of control...

  • Page 74: Operation

    Operation 69 emu40041 procedure for returning to normal cruising 1. To tilt the outboard motor down to the normal running position, move the gear shift lever to the neutral position. 2. Slightly tilt the outboard motor up, and then slowly tilt the outboard motor down while pulling the tilt support b...

  • Page 75: Maintenance

    Maintenance 70 emu43051 transporting and storing out- board 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 consider- ably as it warms up and can build up pressure in the fuel container. T...

  • Page 76: Maintenance

    Maintenance 71 tip: place a towel or something similar under the outboard motor to protect it from damage. F4b, f5a, f6c warning ewm02300 do not hold the top cowling or tiller handle when mounting or dismounting the out- board motor. Otherwise, the outboard mo- tor could fall. 1. Stop the engine and...

  • Page 77: Maintenance

    Maintenance 72 4. When using a portable fuel tank, discon- nect the fuel hose from the fuel joint, and then install the fuel joint cap. Warning! When not using a portable fuel tank, make sure to install the fuel joint cap. Otherwise, injury could result from striking the fuel joint accidentally. [ew...

  • Page 78: Maintenance

    Maintenance 73 9. When transporting or storing the out- board motor while removed from a boat, use an outboard motor stand. 10. If transporting or storing the outboard mo- tor horizontally cannot be avoided, tight- en the clamp screws completely, place a towel or something similar under the out- boa...

  • Page 79: Maintenance

    Maintenance 74 notice ecm02551 ● do not place the outboard motor on its side before the cooling water has drained from it completely. Otherwise, water may enter the cylinder through the exhaust valve and cause engine trouble. ● transport and store the outboard motor as specified in “transporting/dis...

  • Page 80: Maintenance

    Maintenance 75 12. Tighten the drain screw. Install the grom- met. 13. Place the fuel cock in the closed position. Tighten the air vent screw. 14. If “fogging oil” is not available, remove the spark plug. Pour a teaspoonful of clean engine oil into the cylinder. Crank several times manually. Replace...

  • Page 81: Maintenance

    Maintenance 76 7. Fill the test tank with fresh water to above the level of the anti-cavitation plate. Notice: if the fresh water level is be- low the level of the anti-cavitation plate, or if the water supply is insuffi- cient, engine seizure may occur. [ecm00291] 8. Move the gear shift lever to th...

  • Page 82: Maintenance

    Maintenance 77 ing of the engine is mandatory to prevent ex- cessive engine damage due to rust. Perform the flushing and fogging at the same time. 1. Wash the outboard motor body using fresh water. Notice: do not spray wa- ter into the air intake. [ecm01840] for further information, see page 78. 2. ...

  • Page 83: Maintenance

    Maintenance 78 12. If “fogging oil” is not available, run the engine at engine idle speed until the fuel system empties and the engine stops. Check that the engine has stopped, and then remove the spark plug. Pour a tea- spoonful of clean engine oil into the cylin- der. Crank several times manually....

  • Page 84: Maintenance

    Maintenance 79 ● turn off the engine and keep engine shut-off cord (lanyard) with you when you perform maintenance unless other- wise specified. ● allow the engine to cool before handling hot parts or fluids. ● always completely reassemble the mo- tor before operation. Emu28511 replacement parts if ...

  • Page 85: Maintenance

    Maintenance 80 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 86: Maintenance

    Maintenance 81 fuel/engine oil leakage inspection gear oil replacement greasing points greasing impeller/water pump housing inspection or replace- ment as necessary impeller/water pump housing replacement propeller/propeller nut/cotter pin inspection or replace- ment as necessary shift link inspecti...

  • Page 87: Maintenance

    Maintenance 82 emu34451 maintenance chart 2 emu28943 greasing yamaha grease a (water resistant grease) yamaha grease d (corrosion resistant grease; for propeller shaft) f2.5a item actions every 1000 hours exhaust guide/exhaust manifold inspection or replace- ment as necessary u6bv23e0.Book page 82 t...

  • Page 88: Maintenance

    Maintenance 83 f4b, f5a, f6c zmu06764 u6bv23e0.Book page 83 tuesday, april 5, 2011 2:38 pm.

  • Page 89: Maintenance

    Maintenance 84 emu39293 cleaning and adjusting spark plug the spark plug is an important engine compo- nent. The condition of the spark plug can indi- cate something about the condition of the engine. For example, if the center electrode porcelain is very white, this could indicate an intake air lea...

  • Page 90: Maintenance

    Maintenance 85 tip: if a torque-wrench is not available when you are fitting a spark plug, a good estimate of the correct torque is 1/4 to 1/2 a turn past finger- tight. Have the spark plug adjusted to the cor- rect torque as soon as possible with a torque- wrench. Emu42462 checking fuel filter (f2....

  • Page 91: Maintenance

    Maintenance 86 2. Prepare a suitable container that holds a larger amount than the engine oil capaci- ty. Loosen and remove the drain screw while holding the container under the drain hole. Then remove the oil filler cap. Let the oil drain completely. Wipe up any spilled oil immediately. 3. Put a ne...

  • Page 92: Maintenance

    Maintenance 87 with oil if it is below the lower mark, or drain to the specified level if it is above the upper mark. 7. Dispose of used oil according to local regulations. Tip: ● for more information on the disposal of used oil, consult your yamaha dealer. ● change the oil more often when operating...

  • Page 93: Maintenance

    Maintenance 88 7. If the oil changer is not available, remove the drain screw while holding a container under the drain hole. Let the oil drain completely. Wipe up any spilled oil imme- diately. 8. If the drain screw was removed, install a new washer and drain screw, and then tighten the drain screw...

  • Page 94: Maintenance

    Maintenance 89 16. Dispose of used oil according to local regulations. Tip: ● for more information on the disposal of used oil, consult your yamaha dealer. ● change the oil more often when operating the engine under adverse conditions such as extended trolling. 17. Install the top cowling. Emu39771 ...

  • Page 95: Maintenance

    Maintenance 90 3. Remove the propeller and thrust washer. Emu30672 installing propeller emu39323 spline models notice ecm00501 make sure to use a new cotter pin and bend the ends over securely. Otherwise, the propeller could come off during opera- tion and be lost. 1. Apply yamaha grease d (corrosio...

  • Page 96: Maintenance

    Maintenance 91 f2.5a f4b, f5a, f6c 4. Remove the oil level plug and gasket to allow the oil to drain completely. Notice: check the used gear oil after it has been drained. If the gear oil is milky or contains water or a large amount of metal particles, the gear case may be damaged. Have a yamaha dea...

  • Page 97: Maintenance

    Maintenance 92 7. Put a new gasket on the gear oil drain screw. Insert and tighten the gear oil drain screw. Emu39332 inspecting and replacing anode (ex- ternal) yamaha outboard motors are protected from corrosion by sacrificial anode. Inspect the ex- ternal anode periodically. Remove scales from th...

  • Page 98: Trouble Recovery

    Trouble recovery 93 emu39523 troubleshooting this section describes the likely causes and remedies for problems, such as those in the fuel, compression, and ignition systems, poor starting, and loss of power. Please note that all of the items in this section may not apply to your model. If your outb...

  • Page 99: Trouble Recovery

    Trouble recovery 94 a. Loosen air vent screw. Q. Is choke knob pulled out? A. Return to home position. Q. Is carburetor clogged? A. Have serviced by a yamaha dealer. Q. Is fuel joint connection incorrect? A. Connect correctly. Q. Is throttle cable adjustment incorrect? A. Have serviced by a yamaha d...

  • Page 100: Trouble Recovery

    Trouble recovery 95 a. Connect correctly. Engine vibrates excessively. Q. Is propeller damaged? A. Have propeller repaired or replaced. Q. Is propeller shaft damaged? A. Have serviced by a yamaha dealer. Q. Are weeds or other foreign material tan- gled on propeller? A. Remove and clean propeller. Q....

  • Page 101: Trouble Recovery

    Trouble recovery 96 ● an unguarded, rotating flywheel is very dangerous. Keep loose clothing and other objects away when starting the en- gine. Use the emergency starter rope only as instructed. Do not touch the fly- wheel or other moving parts when the engine is running. Do not install the starter ...

  • Page 102: Trouble Recovery

    Trouble recovery 97 9. Install 2 bolts into the rear section of the fuel tank. 10. Prepare the engine for starting; see page 49. Be sure the engine is in neutral and that the clip is attached to the engine shut-off switch. 11. Turn the lever on the carburetor to oper- ate the choke system when the e...

  • Page 103: Trouble Recovery

    Trouble recovery 98 ● 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. ● make sure that no one is...

  • Page 104: Trouble Recovery

    Trouble recovery 99 5. Reinstall 2 bolts to secure the fuel tank. 6. Insert the knotted end of the emergency starter rope into the notch in the flywheel magnet and wind the rope several turns around the flywheel magnet clockwise. 7. Attach the engine shut-off cord to a se- cure place on your clothin...

  • Page 105: Trouble Recovery

    Trouble recovery 100 emu33501 treatment of submerged motor if the outboard motor is submerged, immedi- ately take it to a yamaha dealer. Otherwise some corrosion may begin almost immediate- ly. Notice: do not attempt to run the out- board motor until it has been completely inspected. [ecm00401] 1. C...

  • Page 106

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