- DL manuals
- Yamaha
- Outboard Motor
- 4AC
- Owner's Manual
Yamaha 4AC Owner's Manual
Summary of 4AC
Page 1
Owner’s manual 4ac 5c 6e3-28199-r1-e0 u6e3r1e0.Book page 1 thursday, march 2, 2006 9:44 am.
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Read this owner’s manual carefully before operating your outboard motor. U6e3r1e0.Book page 1 thursday, march 2, 2006 9:44 am.
Page 3
Important manual information emu25101 to the owner thank you for choosing 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 ne...
Page 4: Table Of Contents
Table of contents general information .......................... 1 identification numbers record .......... 1 outboard motor serial number ........... 1 ec label........................................... 1 gost-r label.................................. 1 safety information ............................
Page 5: Table Of Contents
Table of contents maintenance..................................... 29 specifications ................................ 29 transporting and storing outboard motor........................... 30 clamp screw mounting models ........ 30 storing outboard motor..................... 30 procedure................
Page 6: General Information
General information 1 emu25170 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 7: General Information
General information 2 emu25371 safety information ● before mounting or operating the outboard motor, read this entire manual. Reading it should give you an understanding of the motor and its operation. ● before operating the boat, read any own- er’s or operator’s manuals supplied with it and all lab...
Page 8: General Information
General information 3 ● when replacing oils used to lubricate the product (engine or gear oil), be sure to wipe away any spilt oil. Never pour oil without us- ing a funnel or similar device. If necessary, verify the necessary replacement proce- dure with the dealer. ● never illegally discard (dump) ...
Page 9: General Information
General information 4 caution: ecm00010 use only new clean gasoline which has been stored in clean containers and is not contaminated with water or foreign matter. Emu25590 gasoline if knocking or pinging occurs, use a different brand of gasoline or premium unleaded fuel. If unleaded gasoline is not...
Page 10: General Information
General information 5 1. Start-in-gear protection label zmu01713 1 u6e3r1e0.Book page 5 thursday, march 2, 2006 9:44 am.
Page 11: Basic Components
Basic components 6 emu25797 main components note: * may not be exactly as shown; also may not be included as standard equipment on all models. Emu25802 fuel tank if your model was equipped with a portable fuel tank, its function is as follows. Warning ewm00020 the fuel tank supplied with this engine...
Page 12: Basic Components
Basic components 7 mercial users should conform to relevant licensing or approval authority regula- tions. Emu25821 fuel tank if your model included a fuel tank, its parts and functions are as follows. Emu25830 fuel joint this joint is used to connect the fuel line. Emu25841 fuel gauge this gauge is...
Page 13: Basic Components
Basic components 8 emu25901 open the fuel cock has two open positions, one for selecting fuel flow from the built-in fuel tank, and one for an external tank. Fuel flows to the carburetor with the lever or knob in either open position. These are the normal running positions. Emu25911 tiller handle to...
Page 14: Basic Components
Basic components 9 emu25971 throttle friction adjuster a friction device provides adjustable resis- tance to movement of the throttle grip or the remote control lever, and can be set accord- ing to operator preference. To increase resistance, turn the adjuster clockwise. To decrease resistance, turn...
Page 15: Basic Components
Basic components 10 emu26001 engine stop button to open the ignition circuit and stop the en- gine, push this button. Emu26020 choke knob to supply the engine with the rich fuel mixture required to start, turn this knob to the right. Emu26070 manual starter handle to start the engine, first gently p...
Page 16: Basic Components
Basic components 11 emu26330 tilt support bar the tilt support bar keeps the outboard motor in the tilted up position. Emu26372 top cowling lock lever(s) (turn type) to remove the engine top cowling, turn the lock lever(s) and lift off the cowling. When in- stalling the cowling, check to be sure it ...
Page 17: Operation
Operation 12 emu26901 installation caution: ecm00110 incorrect engine height or obstructions to smooth water flow (such as the design or condition of the boat, or accessories such as transom ladders or depth finder trans- ducers) can create airborne water spray while the boat is cruising. Severe eng...
Page 18: Operation
Operation 13 tends to occur, thus reducing the propulsion; and if the propeller tips cut the air, the engine speed will rise abnormally and cause the en- gine to overheat. If the mounting height is too low, the water resistance will increase and thereby reduce engine efficiency. Mount the outboard m...
Page 19: Operation
Operation 14 3. Secure the clamp bracket to the transom using the bolts provided with the out- board (if packed). For details, consult your yamaha dealer. Warning ewm00650 avoid using bolts, nuts or washers other than those contained in the engine pack- aging. If used, they must be of at least the s...
Page 20: Operation
Operation 15 5. After the first 10 hours: operate the engine normally. Use the standard premix ratio of gasoline and oil. For details on mixing fuel and oil, see page 15. Emu27102 preoperation checks warning ewm00080 if any item in the preoperation check is not working properly, have it inspected an...
Page 21: Operation
Operation 16 emu27253 filling fuel for built-in tank warning ewm00060 gasoline and its vapors are highly flam- mable and explosive. Keep away from sparks, cigarettes, flames, or other sourc- es of ignition. 1. With the outboard motor tilted down (in the vertical running position), remove the fuel ta...
Page 22: Operation
Operation 17 2. Replace the fuel tank cap and close tight- ly. 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 ...
Page 23: Operation
Operation 18 ● high oil ratio: too much oil could cause fouled spark plugs, smoky exhaust, and heavy carbon deposits. Note: if using a permanently installed tank, pour the oil gradually as the gasoline is being added to the tank. Emu27450 operating engine emu27461 feeding fuel (portable tank) warnin...
Page 24: Operation
Operation 19 note: during engine operation place the tank hori- zontally, otherwise fuel cannot be drawn from the fuel tank. 4. Squeeze the primer pump with the outlet end up until you feel it become firm. Emu27472 feeding fuel warning ewm00420 ● before starting the engine, make sure that the boat i...
Page 25: Operation
Operation 20 emu27490 starting engine emu27505 manual start models (tiller control) 1. Place the gear shift lever in neutral. Note: the start-in-gear protection device prevents the engine from starting except when in neu- tral. 2. Attach the engine stop switch lanyard to a secure place on your cloth...
Page 26: Operation
Operation 21 ● if the choke knob is left in the “ ” (start) position while the engine is running, the en- gine will run poorly or stall. 5. Pull the manual starter handle slowly until you feel resistance. Then give a strong pull straight out to crank and start the en- gine. Repeat if necessary. 6. A...
Page 27: Operation
Operation 22 emu27740 shifting warning ewm00180 before shifting, make sure there are no swimmers or obstacles in the water near you. Caution: ecm00220 to change the boat direction or shifting position from forward to reverse or vice- versa, first close the throttle so that the en- gine idles (or run...
Page 28: Operation
Operation 23 note: the outboard motor can turn 360° in its brack- et (full-pivot system). The boat can also be backed up by simply turning the outboard mo- tor around 180° with the steering handle fac- ing toward you. Emu27820 stopping engine before stopping the engine, first let it cool off for a f...
Page 29: Operation
Operation 24 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 bracket. 3. Reposition the rod in the des...
Page 30: Operation
Operation 25 bow up too much trim-out puts the bow of the boat too high in the water. Performance and econ- omy are decreased because the hull of the boat is pushing the water and there is more air drag. Excessive trim-out can also cause the propeller to ventilate, which reduces perfor- mance furthe...
Page 31: Operation
Operation 26 ● the outboard motor cannot be tilted when in reverse or when the outboard motor is turned 180° (facing the rear). Emu27964 procedure for tilting up (manual tilt models) 1. Place the gear shift lever in neutral (if equipped) and face the outboard motor forward. 2. On full-pivot system m...
Page 32: Operation
Operation 27 7. Tilt support lever equipped models: hold the rear handle and tilt the engine up fully until the tilt support lever automatically locks. Note: tilt support lever/bar equipped models: if the motor is not facing forward, the tilt support le- ver/bar cannot automatically turn to the lock...
Page 33: Operation
Operation 28 ting up for and cruising in shallow water. Otherwise severe damage from overheat- ing can result. Emu28101 procedure 1. Place the gear shift lever in neutral and face the outboard motor forward. 2. Slightly tilt the outboard motor up until the tilt support bar automatically turns to the...
Page 34: Maintenance
Maintenance 29 emu31480 specifications note: “(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 installed. Emu28218 dimens...
Page 35: Maintenance
Maintenance 30 emu28222 transporting and storing out- board motor warning ewm00690 ● leaking fuel is a fire hazard. When trans- porting and storing the outboard motor, close the air vent screw and fuel cock to prevent fuel from leaking. ● use care when transporting fuel tank, whether in a boat or ca...
Page 36: Maintenance
Maintenance 31 caution: ecm01411 ● 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 port and cause engine trouble. ● store the outboard motor in a dry, well- ventilated place, not in direct...
Page 37: Maintenance
Maintenance 32 13. If “fogging oil” is not available, remove the spark plug(s). Pour a teaspoonful of clean engine oil into each cylinder. Crank several times manually. Replace the spark plug(s). 14. Drain the fuel from both the built-in and portable fuel tanks, on equipped models. Note: portable fu...
Page 38: Maintenance
Maintenance 33 emu28522 maintenance chart frequency of maintenance operations may be adjusted according to the operating conditions, but the following table gives general guidelines. Refer to the sections in this chapter for expla- nations of each owner-specific action. Note: when operating in salt ...
Page 39: Maintenance
Maintenance 34 emu28940 greasing yamaha grease a (water resistant grease) yamaha grease d (corrosion resistant grease; for propeller shaft) emu28952 cleaning and adjusting spark plug warning ewm00560 when removing or installing a spark plug, be careful not to damage the insulator. A damaged insulato...
Page 40: Maintenance
Maintenance 35 should periodically remove and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode. If electrode erosion becomes ex- cessive, or if carbon and other deposits are excessive, you should replace the spark plug with another of the corr...
Page 41: Maintenance
Maintenance 36 checkpoints ● fuel system parts leakage ● fuel line joint leakage ● fuel line cracks or other damage ● fuel connector leakage emu28990 checking fuel filter check the fuel filter periodically. The fuel filter is a one piece, disposable type. If foreign mat- ter is found in the filter, ...
Page 42: Maintenance
Maintenance 37 emu29120 exhaust leakage start the engine and check that no exhaust leaks from the joints between the exhaust cover, cylinder head, and body cylinder. Emu29130 water leakage start the engine and check that no water leaks from the joints between the exhaust cover, cylinder head, and bo...
Page 43: Maintenance
Maintenance 38 emu30660 removing the propeller emu29194 spline models 1. Straighten the cotter pin and pull it out us- ing a pair of pliers. 2. Remove the propeller nut, washer, and spacer (if equipped). 3. Remove the propeller and thrust washer. Emu30670 installing the propeller emu30371 spline mod...
Page 44: Maintenance
Maintenance 39 2. Place a suitable container under the gear case. 3. Remove the gear oil drain screw and gas- ket. Note: ● if a magnetic gear oil drain screw is equipped, remove all metal particles from the screw before installing it. ● always use new gaskets. Do not reuse the removed gaskets. 4. Re...
Page 45: Maintenance
Maintenance 40 ● dispose of old gasoline according to lo- cal regulations. 1. Empty the fuel tank into an approved con- tainer. 2. Pour a small amount of suitable solvent into the tank. Install the cap and shake the tank. Drain the solvent completely. 3. Remove the screws holding the fuel joint asse...
Page 46: Maintenance
Maintenance 41 u6e3r1e0.Book page 41 thursday, march 2, 2006 9:44 am.
Page 47: Trouble Recovery
Trouble recovery 42 emu29424 troubleshooting a problem in the fuel, compression, or ignition systems can cause poor starting, loss of pow- er, or other problems. This section describes basic checks and possible remedies, and cov- ers all yamaha outboard motors. Therefore some items may not apply to ...
Page 48: Trouble Recovery
Trouble recovery 43 a. Check for pinched or kinked fuel line or oth- er 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 serviced by a yamaha dealer. Q. Ha...
Page 49: Trouble Recovery
Trouble recovery 44 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 50: Trouble Recovery
Trouble recovery 45 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 properly to shift lever position? A. H...
Page 51: Trouble Recovery
Trouble recovery 46 ● do not attach the lanyard to clothing that could tear loose. Do not route the cord where it could become entangled, preventing it from functioning. ● avoid accidentally pulling the lanyard during normal operation. Loss of engine power means the loss of most steering control. Al...
Page 52: Trouble Recovery
Trouble recovery 47 emu29760 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. If you cannot immediately take the outboard motor to a yamaha dealer, follow the proce- dure below in order...
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U6e3r1e0.Book page 48 thursday, march 2, 2006 9:44 am.
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Yamaha motor co., ltd. Printed on recycled paper printed in japan april 2006–0.8 × 1 cr u6e3r1e0.Book page 1 thursday, march 2, 2006 9:44 am.