Table of Contents
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Table of Contents
Related Manuals for Yamaha 4AC
Summary of Contents for Yamaha 4AC
- Page 1 OWNER’S MANUAL 6E3-28199-R1-E0...
- Page 2 Read this owner’s manual carefully before operating your outboard motor.
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Page 3: Important Manual Information
If there is any To the owner question concerning this manual, please con- Thank you for choosing a Yamaha outboard sult your Yamaha dealer. motor. This Owner’s Manual contains infor- To ensure long product life, Yamaha recom-... -
Page 4: Table Of Contents
Table of contents Breaking in engine ......14 General information ......1 Gasoline and engine oil mixing Identification numbers record ..1 chart (25:1, 50:1)......14 Outboard motor serial number ... 1 Procedure for pre-mixed models ..14 EC label........... 1 Preoperation checks ..... - Page 5 Table of contents Maintenance........29 Specifications ........ 29 Transporting and storing outboard motor......30 Clamp screw mounting models ..30 Storing outboard motor..... 30 Procedure......... 31 Lubrication (except oil injection models)..32 Cleaning the outboard motor.... 32 Checking painted surface of motor..........
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Page 6: General Information
Record your outboard motor serial number in the spaces provided to assist you in ordering spare parts from your Yamaha dealer or for reference in case your outboard motor is sto- 1. EC label location len. -
Page 7: Safety Information
General information EMU25371 This product emits exhaust gases which contain carbon monoxide, a colorless, Safety information odorless gas which may cause brain dam- Before mounting or operating the outboard age or death when inhaled. Symptoms in- motor, read this entire manual. Reading it clude nausea, dizziness, and drowsiness. -
Page 8: Important Labels
Before tilting up the engine or laying it on dure with the dealer. its side: Never illegally discard (dump) the product. Turn the fuel cock to the “closed” posi- Yamaha recommends consulting the deal- tion. er on discarding the product. Tighten the air-vent screw on the fuel EMU25382 tank cap. -
Page 9: Gasoline
Use only new clean gasoline which has more suitable for a smaller operating load. been stored in clean containers and is not Yamaha dealers stock a range of propellers, contaminated with water or foreign matter. and can advise you and install a propeller on... - Page 10 General information ZMU01713 1. Start-in-gear protection label...
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Page 11: Basic Components
Basic components EMU25797 Main components NOTE: * May not be exactly as shown; also may not be included as standard equipment on all models. 1. Air vent screw 17.Rope attachment 2. Fuel tank cap 18.Tilt support lever 3. Top cowling 19.Gear shift lever 4. -
Page 12: Fuel Tank
Basic components mercial users should conform to relevant EMU25850 Fuel tank cap licensing or approval authority regula- This cap seals the fuel tank. When removed, tions. the tank can be filled with fuel. To remove the cap, turn it counterclockwise. EMU25860 Air vent screw This screw is on the fuel tank cap. -
Page 13: Open
Basic components 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. -
Page 14: Throttle Friction Adjuster
Basic components EMU25990 Engine stop lanyard switch The lock plate must be attached to the engine stop switch for the engine to run. The lanyard should be attached to a secure place on the operator’s clothing, or arm or leg. Should the operator fall overboard or leave the helm, the lanyard will pull out the lock plate, stopping ig- nition to the engine. -
Page 15: Engine Stop Button
Basic components EMU26001 Engine stop button To open the ignition circuit and stop the en- gine, push this button. EMU26122 Steering friction adjuster A friction device provides adjustable resis- tance to the steering mechanism, and can be set according to operator preference. An ad- EMU26020 Choke knob justing screw or bolt is located on the swivel... -
Page 16: Tilt Support Bar
Basic components 1. Top cowling lock lever(s) 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 fits properly in the rubber seal. -
Page 17: Operation
Operation EMU26901 EWM00830 Installation WARNING ECM00110 Improper mounting of the outboard motor CAUTION: could result in hazardous conditions such Incorrect engine height or obstructions to as poor handling, loss of control, or fire smooth water flow (such as the design or hazards. -
Page 18: Clamping The Outboard Motor
Consult your mounting point on the boat. Otherwise Yamaha dealer or boat manufacturer for the engine could be completely lost if it further information on determining the prop- accidentally falls off the transom. -
Page 19: Breaking In Engine
Secure the clamp bracket to the transom 5CMH (50:1) using the bolts provided with the out- board (if packed). For details, consult your Yamaha dealer. EWM00650 WARNING Avoid using bolts, nuts or washers other than those contained in the engine pack- aging. -
Page 20: Preoperation Checks
Check fuel line connections to be sure they 12.0 L (3.17 US gal) (2.64 Imp.gal) are tight (if equipped Yamaha fuel tank or boat tank). Be sure the fuel tank is positioned on a se- cure, flat surface, and that the fuel line is not... -
Page 21: Filling Fuel For Built-In Tank
Operation EMU27253 Filling fuel for built-in tank EWM00060 50:1 WARNING 12 L 14 L 24 L (0.26 US gal, (3.2 US gal, (3.7 US gal, (6.3 US gal, Gasoline and its vapors are highly flam- 0.22 Imp gal) 2.6 Imp gal) 3.1 Imp gal) 5.3 Imp gal) mable and explosive. - Page 22 Operation 1. Engine oil 1. Engine oil 2. Gasoline 2. Gasoline Replace the fuel tank cap and close tight- Replace the fuel can cap and close tight- Shake the fuel tank to mix the fuel thor- Shake the fuel can to mix the fuel thor- oughly.
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Page 23: Operating Engine
Operation 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 If there is a fuel joint on the motor, firmly EMU27461 Feeding fuel (portable tank) -
Page 24: Feeding Fuel
Operation For the built in tank, loosen the air vent NOTE: screw on the fuel tank cap by one turn. During engine operation place the tank hori- For the external fuel tank, loosen it on the zontally, otherwise fuel cannot be drawn from fuel tank cap by 2 or 3 turns. -
Page 25: Starting Engine
Operation EMU27490 Starting engine EMU27505 Manual start models (tiller control) Place the gear shift lever in neutral. Place the throttle grip in the “ ” (start) position. NOTE: The start-in-gear protection device prevents the engine from starting except when in neu- tral. -
Page 26: Warming Up Engine
Stop the engine and check whether the cooling water inlet on the low- er case or the cooling water pilot hole is blocked. Consult your Yamaha dealer if the problem cannot be located and cor- rected. ZMU02030... -
Page 27: Shifting
Operation EMU27740 Remote control models Shifting Pull up the neutral interlock trigger (if EWM00180 equipped) and move the remote control lever WARNING quickly and firmly from neutral to forward. Before shifting, make sure there are no EMU27801 Reverse swimmers or obstacles in the water near EWM00190 you. -
Page 28: Stopping Engine
Operation Disconnect the fuel line if you are using NOTE: an external fuel tank. 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. -
Page 29: Adjusting Trim Angle For Manual Tilt Models
Operation EWM00400 WARNING 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 speed gradu- ally and watch for any signs of instability or control problems. -
Page 30: Tilting Up And Down
Operation Bow Up NOTE: Too much trim-out puts the bow of the boat Depending on the type of boat, the outboard too high in the water. Performance and econ- motor trim angle may have little effect on the omy are decreased because the hull of the trim of the boat when operating. -
Page 31: Procedure For Tilting Up (Manual Tilt Models)
Operation 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) Place the gear shift lever in neutral (if equipped) and face the outboard motor forward. -
Page 32: Procedure For Tilting Down (Manual Tilt Models)
Operation Tilt support lever equipped models: Hold EWM00720 WARNING the rear handle and tilt the engine up fully If there is too much resistance it could be until the tilt support lever automatically difficult to steer, which could result in an locks. -
Page 33: Cruising In Other Conditions
Cruising in turbid water Yamaha strongly recommends that you use the optional chromium-plated water pump kit (not available for some models) if you use the outboard motor in turbid or muddy water con-... -
Page 34: Maintenance
Maintenance EMU31480 Ignition system: Specifications Spark plug (NGK): NOTE: 4ACMH B7HS “(AL)” stated in the specification data below 5CMH BR7HS represents the numerical value for the alumi- Spark plug gap: 0.6–0.7 mm (0.024–0.028 in) num propeller installed. Control system: Likewise, “(SUS)” represents the value for Tiller stainless steel propeller installed and “(PL)”... -
Page 35: Transporting And Storing Outboard Motor
The outboard motor should be trailered and It is advisable to have your outboard motor stored in the normal running position. If there serviced by an authorized Yamaha dealer pri- is insufficient road clearance in this position, or to storage. However, you, the owner, with a... -
Page 36: Procedure
Maintenance ECM01411 ECM00290 CAUTION: CAUTION: Do not place the outboard motor on its If the fresh water level is below the level of side before the cooling water has the anti-cavitation plate, or if the water drained from it completely, otherwise supply is insufficient, engine seizure may water may enter the cylinder through the occur. -
Page 37: Lubrication (Except Oil Injection Models)
For information on spark iar with machine servicing, this work plug installation, see page 34. should be done by your Yamaha dealer or Change the gear oil. For instructions, see other qualified mechanic. page 38. Inspect the oil for the presence of water that indicates a leaky seal. -
Page 38: Maintenance Chart
When operating in salt water, turbid or muddy water, the engine should be flushed with clean water after each use. The “ ” symbol indicates the check-ups which you may carry out yourself. The “ ” symbol indicates work to be carried out by your Yamaha dealer. Initial Every Item Actions... -
Page 39: Greasing
Maintenance EMU28940 Greasing Yamaha grease A (water resistant grease) Yamaha grease D (corrosion resistant grease; for propeller shaft) The spark plug is an important engine compo- EMU28952 Cleaning and adjusting spark plug nent and is easy to inspect. The condition of... -
Page 40: Checking Fuel System
Improper repairs can make the outboard unsafe to operate. Check the fuel lines for leaks, crack, or mal- function. If a problem is found, your Yamaha dealer or other qualified mechanic should re- pair it immediately. 1. Spark plug gap 2. -
Page 41: Checking Fuel Filter
Yamaha dealer or other ter is found in the filter, replace it. For replace- qualified mechanic. ment of the fuel filter, consult your Yamaha dealer. Verify whether the idle speed is set to specification. For idle speed specifica- tions, see page 29. -
Page 42: Exhaust Leakage
Maintenance 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 body cylinder. -
Page 43: Removing The Propeller
Severe injury could oc- cur if the outboard motor accidentally Apply Yamaha marine grease or a corro- falls. sion resistant grease to the propeller shaft. -
Page 44: Cleaning Fuel Tank
NOTE: Remove the fuel tank from the boat be- For disposal of used oil, consult your Yamaha fore cleaning it. Work only outdoors in dealer. an area with good ventilation. -
Page 45: Inspecting And Replacing Anode(S)
Dispose of old gasoline according to lo- NOTE: cal regulations. Inspect ground leads attached to external an- odes on equipped models. Consult a Yamaha Empty the fuel tank into an approved con- dealer for inspection and replacement of inter- tainer. - Page 46 Maintenance...
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Page 47: Trouble Recovery
Yamaha outboard motors. Therefore Q. Has fuel pump malfunctioned? some items may not apply to your model. A. Have serviced by a Yamaha dealer. If your outboard motor requires repair, bring it to your Yamaha dealer. Q. Are spark plug(s) fouled or of incorrect... - Page 48 A. Return to normal operating position. A. Fill tank with clean, fresh fuel. Q. Is carburetor clogged? Q. Is fuel filter clogged? A. Have serviced by a Yamaha dealer. A. Clean or replace filter. Q. Is fuel joint connection incorrect? Q. Have ignition parts failed? A.
- Page 49 Q. Is fuel system obstructed? Q. Is water pump or thermostat faulty? A. Check for pinched or kinked fuel line or oth- A. Have serviced by a Yamaha dealer. er obstructions in fuel system. Q. Is there excess water in fuel filter cup? Q.
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Page 50: Temporary Action In Emergency
A. Tighten bolt. EWM01021 WARNING Q. Is steering pivot loose or damaged? Use this procedure only in an emergen- A. Tighten or have serviced by a Yamaha cy to return to the nearest port for re- dealer. pairs. EMU29432 Temporary action in emergency... -
Page 51: Emergency Starting Engine
Trouble Recovery 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. -
Page 52: Treatment Of Submerged Motor
If the outboard motor is submerged, immedi- cranking with the manual starter or emer- ately take it to a Yamaha dealer. Otherwise gency starter rope. some corrosion may begin almost immediate- If you cannot immediately take the outboard... - Page 54 YAMAHA MOTOR CO., LTD. Printed in Japan April 2006–0.8 × 1 CR Printed on recycled paper...