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O W N E R' S
M A N U A L
トーハツ船外機 オーナーズマニュアル
Original instructions
MFS 4C
MFS 5C
MFS 6C
OB No.003-11111-6AK1

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Summary of Contents for TOHATSU MFS4S

  • Page 1 O W N E R’ S M A N U A L トーハツ船外機 オーナーズマニュアル Original instructions MFS 4C MFS 5C MFS 6C OB No.003-11111-6AK1...
  • Page 2 MANUAL IN A SAFE LOCATION FOR FUTURE REFERENCE. Copyright © 2019 Tohatsu Corporation. All rights reserved. No part of this manual may be reproduced or transmitted in any from or by any means without the express written permission of Tohatsu Corporation.
  • Page 3: Your Tohatsu Outboard Motor

    ENOM00006-A To You, Our Customer Thank you for selecting a TOHATSU outboard motor. You are now the proud owner of an excellent outboard motor that will service you for many years to come. This manual should be read in its entirety and the inspection and maintenance proce- dures described later in this manual should be followed carefully.
  • Page 4: Pre-Delivery Check

    ENOM00003-0 PRE-DELIVERY CHECK Be sure that the product has been checked by an authorized TOHATSU dealer before you take delivery. ENOM00005-A Serial Number In the space below, please record the outboard motor's serial number (indicated both on the bracket and on the cylinder block). The serial number will be needed when ordering parts, and when making technical or warranty inquiries.
  • Page 5 ENOM00007-0 NOTICE: DANGER/WARNING/CAUTION/Note Before installing, operating or otherwise handling your outboard motor, be sure to thor- oughly read and understand this Owner's Manual and carefully follow all of the instruc- tions. Of particular importance is information preceded by the words “DANGER,” “WARNING,”...
  • Page 7: Table Of Contents

    CONTENTS 1. GENERAL SAFETY INFORMATION ........10 2.
  • Page 8 12. ACCESSORIES KIT ..........70 13.
  • Page 9 INDEX 1. GENERAL SAFETY INFORMATION 2. SPECIFICATIONS 3. PARTS NAME 4. LABEL LOCATIONS 5. INSTALLATION 6. PRE-OPERATING PREPARATIONS 7. ENGINE OPERATION 8. REMOVING AND CARRYING THE OUTBOARD MOTOR 9. ADJUSTMENT 10. INSPECTION AND MAINTENANCE 11. TROUBLESHOOTING 12. ACCESSORIES KIT 13. PROPELLER TABLE...
  • Page 10: General Safety Information

    GENERAL SAFETY INFORMATION ENOM00009-0 SAFE OPERATION OF BOAT As the operator/driver of the boat, you are responsible for the safety of those aboard and those in other boat around yours, and for following local boating regulations. You should be thoroughly knowledgeable on how to correctly operate the boat, outboard motor, and accessories.
  • Page 11: Maintenance

    GENERAL SAFETY INFORMATION ENOM00010-0 SERVICING, REPLACEMENT PARTS & LUBRICANTS We recommend that only an authorized service shop perform service or maintenance on this outboard motor. Be sure to use genuine parts, genuine lubricants, or recom- mended lubricants. ENOM00011-A MAINTENANCE As the owner of this outboard motor, you should be acquainted with correct mainte- nance procedures following maintenance section of this manual (See page 61).
  • Page 12: Specifications

    SPECIFICATIONS ENOM00810-A MODEL FEATURE Model F6C SP*2 Type (D) MF (D) MF (D) MF Transom heights Tiller Handle Remote Control *1 Separate fuel tank Dual fuel tank Manual tilt *1: Option *2: SP model equip with charging coil as a standard. ENOM00811-A MODEL NAME EXAMPLE F 6 CSUL SP...
  • Page 13 *2:In case of dual fuel tank system. Able to use together with 12 L separate tank. Remark: Specifications subject to change without notice. *3 With propeller, with battery cable. Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
  • Page 14: Parts Name

    PARTS NAME ENOM00402-A 4C, 5C, 6C ENOF01502-0 Tilt Handle Thrust Rod Fuel Cock Top Cowl Clamp Bracket Engine Oil Filler Cap Bottom Cowl Clamp Screw Spark Plug Cooling Water Check Port Throttle Grip Engine Oil Drain Screw Tilt Lever Shift Lever Steering Adjustment Screw Starter Handle Anode...
  • Page 15 PARTS NAME ENOM00822-0 Remote control box & Fuel tank ENOF01404-2 Control Lever Air vent screw Neutral lock arm Fuel tank cap PTT switch Fuel connector (Engine side) Free throttle lever Primer bulb Main switch Fuel connector (Fuel tank Stop switch side) Stop switch lock Stop switch lanyard...
  • Page 16: Label Locations

    LABEL LOCATIONS ENOM00019-A Warning label locations 1, 2, 3 ENOF01503-2...
  • Page 17 LABEL LOCATIONS Warning label urge to read the 6-1. Warning regarding emergency start- owner’s manual. ing (See page 34). 6-2. Warning regarding high temperature. 6-3. Warning regarding rotating object. 6-4. Warning regarding high voltage ENOF00120-0 Warning label regarding oil pressure (See page 29).
  • Page 18 LABEL LOCATIONS Warning regarding gasoline (See page 25). ENOF00005-L...
  • Page 19: Ce Label Locations

    LABEL LOCATIONS ENOM00019-B CE label locations Outboard Motor Rated Power: 0123 Mass: Serial No. Made in Japan CAN ICES-2/NMB-2 ENOF01504-1 1. Model code (Model name) 2. Rated power 3. Dry mass weight (Without propeller, with battery cable) 4. Serial No. 5.
  • Page 20: Installation

    INSTALLATION Keep the outboard motor in a vertical ENOM00024-B 1. Mounting the outboard position when mounting. motor on boat ENOW00006-0 WARNING Most boats are rated and certified in terms of their maximum allowable horsepower, as shown on the boat’s certification plate. Do not equip your boat with an outboard motor that exceeds this limit.
  • Page 21 INSTALLATION ENOM00831-0 Mounting the outboard motor 1. Set the outboard motor to appropri- ate position. 2. Tighten the clamp screws by turning 5−25 mm their handles. (0.2−1 in) 3. Secure the outboard motor to the boat with a rope to prevent acciden- ENOF01506-0 tal loss of the outboard motor over- 1.
  • Page 22: Remote Control Device Installation (Option)

    INSTALLATION ENOM00840-0 2. Remote control device installation (option) ENOW00850-0 Remote control box location ENOF00842-0 Measure the distance from the remote control box to the outboard motor 1, 2 where the remote control cable should be routed. Prepare a cable that is 300-450mm (11.8-17.7in) longer than the measured ENOF00841-1 distance.
  • Page 23 INSTALLATION Prevent electrolyte from coming in con- can lead to poor performance of, and/or tact with any part of your body. Contact damage to, the electrical system. can cause serious burn or, if it comes in contact with your eye, loss of sight. Use ENON00006-A Note safety glasses and rubber gloves.
  • Page 24: Pre-Operating Preparations

    ENOW00020-1 ALCOHOL CAUTION The fuel system components on your When operating a TOHATSU engine on gaso- TOHATSU engine will withstand up to 10% line containing alcohol, storage of gasoline in ethyl alcohol (hereinafter referred to as the fuel tank for long periods should be the "ethanol"), content in the gasoline.
  • Page 25: Fuel Filling

    PRE-OPERATING PREPARATIONS storage if alcohol has washed protective oil When or before refueling: films from internal components. Be sure to remove the static electricity charged in your body before refueling. The sparks due to static electricity may ENOW00018-0 cause explosion of flammable gasoline. WARNING Stop the engine, and do not start the engine during refueling.
  • Page 26 PRE-OPERATING PREPARATIONS 1. When using integral tank Before opening fuel tank cap, turn air vent screw two turns counterclock- wise to release air pressure in the fuel tank. ENOF00418-0 1. Full mark ENOF00416-A 1. Air vent screw 2. Fuel tank cap When using separate tank SAFE FILL LEVEL...
  • Page 27: Engine Oil Recommendation

    PRE-OPERATING PREPARATIONS ENOM00037-A ENOW0002A-A 3. Engine oil recommendation CAUTION Use of engine oils that do not meet these ENOW00022-A requirements will result in reduced engine CAUTION life, and other engine problems. The engine oil is drained for shipping from the factory. Be sure to fill the engine to the proper level before star ting engine.
  • Page 28: Break-In

    PRE-OPERATING PREPARATIONS ]ENOM00033-A 4. Break-In Your new outboard motor and lower unit Always attempt to stay on the windward side of emission. require break-in for the moving compo- nents a ccording to the conditions described in the following time table. ENOW00023-1 Please refer to ENGINE OPERATION sec- CAUTION...
  • Page 29: Warning System

    PRE-OPERATING PREPARATIONS ENOM00039-A 5. Warning system If outboard motor encounters an abnor- mal condition of fault, warning lamp (LED) will be on (engine will not be stopped). See next page for conditions which will lead to an abnormal condition or fault. ENOM00040-D Location of warning lamp Warning lamp (LED)
  • Page 30 PRE-OPERATING PREPARATIONS ENOM00041-D Warning indicators, faults and remedy Warning indicators Description of faults Remedy Sound Lamp (LED) On for several Normal system test when start up sec.l Engine speed exceeds maximum allowable RPM Low oil pressure Remarks *1: In this case, oil pressure switch is “ON”. High speed ESG (Electronic Safety Governor) High speed ESG is a device to prevent over revolution of the engine.
  • Page 31: Engine Operation

    ENGINE OPERATION ENOM00042-0 ENOW00403-0 Before starting CAUTION When separate tank is used for dual tank ENOW00022-A model, be sure to open air vent of integral CAUTION tank as well as air vent of separate tank. If air vent of integral tank that contains fuel is The engine oil is drained for shipping from closed, swelling of air in the tank by heat the factory.
  • Page 32: Starting The Engine

    ENGINE OPERATION And then, connect the fuel connector to the fuel tank side. ENOM00045-C 2. Starting the engine ENOW00036-A CAUTION When the engine is started in the test tank, to avoid over heating and water pump dam- age, be sure the water level is at least 10 cm (4 in.) above the anti ventilation plate.
  • Page 33: Tiller Handle Type

    ENGINE OPERATION 3. Set the throttle grip to START posi- ENOW00032-B tion. CAUTION Do not try to crank after engine has started. This model is provided with start in gear protection. ENON00010-0 Note Start-in-gear protection prevents engine from starting at other than neutral shift. ENOF01107-0 In-gear starting of engine will move the 1.
  • Page 34: Emergency Starting

    ENGINE OPERATION Attach engine stop switch lanyard to ENOW00064-0 clothing or any par t of body like arm CAUTION before starting engine. Engine may be hot immediately after operat- 1. Remove the top cowl. ing and could cause burns if touched. Allow engine to cool down before attempting to carry the outboard.
  • Page 35: Warming Up The Engine

    ENGINE OPERATION After engine starts, do not reinstall flywheel cover and top cowl. ENOM00043-A 3. Warming up the engine ENOW00932-0 CAUTION Be sure to check that cooling water is com- ing out of the cooling water check port dur- ENOF00435-0 ing warm up.
  • Page 36: Forward, Reverse, And Acceleration

    ENGINE OPERATION ENOM00046-A ENOW00861-0 WARNING 4. Forward, reverse, and acceleration Do not shift at high boat speed, or control may be lost, falling down or causing passen- ENOW00037-0 ger(s) to be thrown overboard. Leading to serious personal injury. WARNING ENOW00862-0 Before shifting into forward or reverse, make sure that boat is properly moored and out- CAUTION...
  • Page 37: Stopping The Engine

    ENGINE OPERATION Acceleration ENOM00890-A Tiller handle type ENOW00867-0 ENOW00865-A WARNING CAUTION Sudden acceleration and deceleration may Do not force to shift when the throttle grip is cause passenger(s) to be thrown overboard not in the fully closed position, otherwise, or falling down. steering system and/or shifting mechanism Open throttle grip gradually.
  • Page 38 ENGINE OPERATION Tiller handle type Emergency engine stopping 1. Turn the throttle grip to the slow Remove stop switch lock to stop the position. engine. ENOF01107-0 ENOF00439-0 ENOF00210-0 1. Throttle grip 1. Hock 2. Put the shift lever in the Neutral posi- 2.
  • Page 39: Steering

    ENGINE OPERATION ENOM00920-A ENOW00044-0 6. Steering WARNING Excessive trim up or down may lead to unsta- ENOW00870-0 ble boat operation, potentially causing the WARNING steering difficulty that leads to accident during cruising. Sudden steering may cause passenger(s) to Do not cruise at high speed if improper be thrown overboard or falling down.
  • Page 40: Tilt Up And Down

    ENGINE OPERATION 4. Remove the thrust rod as shown pic- ture. ENOF00052-0 ENOM00054-0 Improper trim angle (bow dips into the water) Set the thrust rod (or preset knob) ENOF01238-1 higher if the bow of the boat is below 1. Push in 2.
  • Page 41 ENGINE OPERATION ENOW00056-A WARNING When tilting up outboard motor with fuel joint for over a few minutes, be sure to dis- connect fuel hose, or fuel may leak, poten- tially catching fire. ENOW00057-0 CAUTION Do not tilt up outboard motor while engine operates, or no cooling water may be fed, leading to engine seizure due to overheating.
  • Page 42: Shallow Water Operation

    ENGINE OPERATION Manual tilt type ENOM00068-A 9. Shallow water operation Shallow water running position: 1. With the shift lever in Forward, tilt the motor up slowly by about 40° and ENOW00051-0 then lower the tilt lever for setting at WARNING the shallow water running position.
  • Page 43: Removing And Carrying The Outboard Motor

    REMOVING AND CARRYING THE OUTBOARD MOTOR ENOM00070-C ENOM00071-A 1. Removing the outboard 2. Carrying the outboard motor motor ENOW00933-0 ENOW00064-0 WARNING CAUTION Be sure to disconnect fuel connector except when operating engine. Engine may be hot immediately after operat- Fuel leakage is a fire or explosion hazard, ing and could cause burns if touched.
  • Page 44: Trailering

    REMOVING AND CARRYING THE OUTBOARD MOTOR Fuel leakage is a fire or explosion hazard, which can cause serious injury or death. ENOF00075-1 ENOW00068-0 WARNING Close air vent screw of fuel tank and fuel ENOF01511-0 cock before carrying or storing outboard motor and fuel tank, or fuel may leak, poten- ENON00021-1 tially catching fire.
  • Page 45 REMOVING AND CARRYING THE OUTBOARD MOTOR When transporting a boat on a trailer with the outboard motor still attached, disconnect the fuel line from the out- board motor beforehand and keep the outboard motor in the normal running position or on a transom saver bar. Tiller handle type To prevent the outboard motor from moving when it is attached on a boat...
  • Page 46: Adjustment

    ADJUSTMENT ENOM00073-E EENOM00074-A 1. Steering friction 2. Throttle grip friction Tiller handle type ENOW00074-B WARNING ENOW00074-B WARNING Do not overtighten the throttle adjustment screw or it could result in difficulty of move- Do not over tighten the steering friction ment resulting in the loss of control causing adjustment screw it could result in difficulty an accident and could lead to severe injury.
  • Page 47: Inspection And Maintenance

    INSPECTION AND MAINTENANCE ENOM00077-0 Care of your outboard motor To keep your outboard motor in the best operating condition, it is very important that you perform daily and periodic maintenance as suggested in the mainte- nance schedules that follow. ENOW00077-0 CAUTION Your personal safety and that of your pas- sengers depends on how well you main-...
  • Page 48: Daily Inspection

    INSPECTION AND MAINTENANCE ENOM00428-0 1. Daily Inspection Perform the following checks before and ENOW00078-1 after use. WARNING Do not use outboard motor if any abnormal- ity is found during pre-operation check oth- erwise it could result in severe damage to the motor or severe personal injury.
  • Page 49: Oil Level Checking

    INSPECTION AND MAINTENANCE ENOM00081-B ENON00025-0 Oil level checking Note If the oil level is low, or too high, the life Consult with an authorized dealer if the of the engine will be shortened signifi- engine oil is milky color, or appears con- taminated.
  • Page 50: Washing Outboard Motor

    INSPECTION AND MAINTENANCE ENOM00083-B ENOM00085-A Washing outboard motor Flushing attachment ENOW00922-0 ENOW00081-0 CAUTION WARNING To prevent the engine from starting when Do not start engine without removing pro- you are near the propeller, remove the stop peller, or accidentally turning propeller switch lock.
  • Page 51 If the fuse continues to blow, request an age, be sure the water level is at least 10 cm (4 in.) above the anti ventilation plate. authorized Tohatsu dealer to inspect the And be sure to remove the propeller, when outboard motor.
  • Page 52 INSPECTION AND MAINTENANCE 4. Remove the fuse and check it. If the fuse is blown, replace it with a fuse of the same specified rating. The out- board motor is supplied with spare fuses in the spare fuse holder. ENOF01524-0 1.
  • Page 53: Periodic Inspection

    INSPECTION AND MAINTENANCE ENOM00431-0 2. Periodic Inspection It is important to inspect and maintain your outboard motor regularly. At each interval on the chart below, be sure to perform the indicated servicing. Maintenance intervals should be determined according to the number of hours or num- ber of months, whichever comes first.
  • Page 54: Engine Oil Replacement

    INSPECTION AND MAINTENANCE ENON00030-0 Note Your outboard motor should receive careful, and complete inspection at 300 hours. This is the best time for major maintenance procedures to be carried out. ENOM00091-B ENOW00933-0 Engine oil replacement CAUTION ENOW00091-0 Engine oil mixed with dust or water will dra- CAUTION matically shorten the life of the engine.
  • Page 55: Fuel Filters And Fuel Tank Cleaning

    INSPECTION AND MAINTENANCE 5. Tighten the oil drain screw with apply- ing oil on the sealing surface of screw. (Use new oil drain washer) 10W−40 Oil drain screw specified torque 10W−30 18N·m (13 ft lb, 1.8 kgf · · 6. Remove the top cowl and the oil filler ˚C cap.
  • Page 56: Fuel Filter (For Engine)

    INSPECTION AND MAINTENANCE Wipe off gasoline well immediately if 2. Clean the fuel filter and check the O- spilled and dispose of it in accordance ring. Replace it if necessary. with local fire prevention and environ- 3. Reassemble all parts. ment protection regulations.
  • Page 57: Gear Oil Replacement

    INSPECTION AND MAINTENANCE ENOM00098-A ENON00033-0 Gear oil replacement Note ENOW00094-0 Use genuine gear oil or the recommended one (API GL-5: SAE #80 to #90). WARNING Required volume: approx. 195 mL (6.6 fl.oz.). Be sure that outboard motor is secured to transom or service stand, or accidental drop or fall of outboard motor could lead to severe personal injury.
  • Page 58: Propeller Replacement

    INSPECTION AND MAINTENANCE After installing split pin, spread the pin ENOW00928-0 apart to prevent it from falling out which CAUTION could lead to the propeller coming off during operation. Wipe off gear oil well immediately if spilled and dispose of it in accordance with local A worn-out or bent propeller will lower fire prevention and environment protection the motor's performance, and cause...
  • Page 59 INSPECTION AND MAINTENANCE and could cause severe burns if touched. Allow motor to cool down first. ENOW00929-0 CAUTION Use only the recommended spark plugs. Spark plugs which have an different heat range may cause engine damage. If the spark plug(s) is fouled, has carbon ENOF00450-A b uil d up , or is w orn , it sh oul d b e replaced.
  • Page 60 INSPECTION AND MAINTENANCE 1. Electrode 2. Spark gap (0.8–0.9 mm, 0.031–0.035 in) 7. Install the spark plug by hand and turn it carefully to avoid cross-threading. 8. Tighten the spark plug to the speci- fied torque. ENON00028-0 Note Spark plug torque: 18.0 N·m (13.3 ft·lb) [1.84 kgf·m] If a torque-wrench is not available when you are fitting a spark plug, a good esti-...
  • Page 61: Anode Replacement

    INSPECTION AND MAINTENANCE ENOM00088-B Anode replacement A sacrificial anode protects the outboard motor from electrolytic corrosion. Anode is located on the gear case, etc.. When the anode is eroded more than 1/3 of original size, replace it. ENON00029-0 Notes Never grease or paint the anode. At each inspection re-tighten the anode attaching bolt.
  • Page 62: Grease Point

    INSPECTION AND MAINTENANCE ENOM00960-0 Grease point Apply water proof grease to the parts shown below. ENOF01519-0...
  • Page 63: Off-Season Storage

    INSPECTION AND MAINTENANCE 3. Drain all fuel from the fuel hoses, fuel ENOM00100-A 3. Off-season storage pump and carburetor (See page 65), and clean these parts. ENOW00934-0 Keep in mind that if gasoline is kept in the carburetor for a long time, gum WARNING and varnish will develop, causing the Be sure to disconnect fuel connector...
  • Page 64 INSPECTION AND MAINTENANCE 9. Stand the outboard motor up verti- cally in a dry place. ENOF01512-0 ENOM00950-0 Adding a fuel stabilizer When adding a fuel stabilizer additive (commercially available), first fill the fuel tank with fresh fuel. If the fuel tank is only partially filled, air in the tank can cause the fuel to deteriorate during storage.
  • Page 65: Fuel System Draining

    INSPECTION AND MAINTENANCE 8. Check the drained fuel for the pres- ENOM00970-0 Fuel system draining ence of water or other contaminants. ENOW00028-A If either is present, reassemble the WARNING outboard motor, refill the carburetor with fuel, and then drain the fuel For details on handling fuel, contact an again.
  • Page 66: Pre-Season Check

    INSPECTION AND MAINTENANCE 5. Recharge the battery once a month 9. Run the engine for 10 minutes at half to prevent it from discharging and the throttle. The oil used for storage electrolyte from deteriorating. inside the engine will be circulated out to assure optimum performance.
  • Page 67: Cold Weather Precautions

    INSPECTION AND MAINTENANCE ENOM00106-A ENOM00120-2 6. Cold weather precautions 8. Auxiliary outboard motor operation If you moor your boat in cold weather at temperatures below 0°C (32°F), there is When the auxiliary outboard motor is not the danger of remained water freezing in in operation, be sure to remove the stop the cooling water pump, which may dam- switch lock, shift into forward, and then...
  • Page 68: Troubleshooting

    TROUBLESHOOTING ENOM00436-0 If you encounter a problem, consult the check list below to determine the cause and to take the proper action. An authorized dealer will always be happy to provide any assistance and information. Possible cause Empty fuel tank Incorrect connection of fuel system Air entering fuel line Deformed or damaged fuel hose...
  • Page 69 TROUBLESHOOTING Possible cause Low oil level Use of improper oil Oil deterioration Clogged oil strainer Faulty oil pump Incorrect adjustment of throttle link Insufficient cooling water flow, clogged or defective pump Faulty thermostat Cavitation or ventilation Incorrect propeller selection Damaged or bent propeller Improper thrust rod position Unbalanced load on boat Transom too high or too low...
  • Page 70: Accessories Kit

    ACCESSORIES KIT ENOM00437-0 Items Quantity Remark Tool bag Pliers Socket wrench 10 × 13 mm Service tools Socket wrench 16 mm Socket wrench handle Screwdrivers Cross-and straight-point Screwdriver handle Emergency starter rope 1000 mm Spark plug NGK: DCPR6E Spare parts Split pin Stop switch lock Fuel tank...
  • Page 71: Propeller Table

    PROPELLER TABLE ENOM00438-0 Use a genuine propeller. A propeller must be selected so that the engine RPM measured at wide open throttle while cruising is within the recommended range. 4: 4500–5500 min (rpm) 5: 4500–5500 min (rpm) 6: 5000–6000 min (rpm) Propeller Size (Diameter ×...
  • Page 72 O W N E R’ S M A N U A L MFS 4C MFS 5C MFS 6C 5-4, Azusawa 3-Chome, Itabashi-Ku Tokyo 174-0051, Japan Tel: +81-3-3966-3117 Fax: +81-3-3966-0090 www.tohatsu.com...

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