TOHATSU MFS 6CZ Owner's Manual
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TOHATSU MFS 6CZ Owner's Manual

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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 6CZ
MFS 8C
MFS 9.9CY
OB No.003-11175-0BD1
EN

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  • 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 6CZ MFS 8C MFS 9.9CY OB No.003-11175-0BD1...
  • Page 2 MANUAL IN A SAFE LOCATION FOR FUTURE REFERENCE. Copyright © 2024 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 In case you encounter any problems, please contact an authorized TOHATSU service shop or dealer for assistance. Tohatsu Corporation reserves the right to change, modify, add, or remove a part or whole of the owner’s manual without prior notice and incurring any obligations.
  • Page 4 ENOM00003-1 PRE-DELIVERY INSPECTION Make sure Pre-delivery inspection has been properly done by authorized TOHATSU dealer before operating your outboard motor. ENOM00005-1 Serial Number Your outboard motor has a unique serial number. The serial number is identification of outboard motor and is located on the outboard motor as shown in the figures below.
  • 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 ..........87 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 ENOM00009-1 SAFE OPERATION OF BOAT As the operator/driver of a 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 Be sure to use genuine parts, genuine lubricants, or recom- mended lubricants. Be aware that the installation and use of parts not approved by Tohatsu Corporation will void warranty and may lead to unsafe operating conditions. ENOM00011-1...

  • Page 12: Specifications

    SPECIFICATIONS ENOM00810-A MODEL FEATURE Model MFS 6CZ MFS 8C MFS 9.9CY Type Transom heights Tiller handle Remote control Power Tilt Manual Tilt *1: Option ENOM00811-A MODEL NAME EXAMPLE MFS 9.9CY EPTL Model Horse Product Starter Steering Shaft Tilt system description...
  • Page 13 — (ICOMIA 38/94 Rev.1) m/s Remark: Specifications subject to change without notice. *1: With propeller, with battery cable. *2: With Manual Start. *3: Transom angle is at -12° Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
  • Page 14 — (ICOMIA 38/94 Rev.1) m/s Remark: Specifications subject to change without notice. *1: With propeller, with battery cable. *2: With Manual Start. *3: Transom angle is at -12° Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
  • Page 15 — (ICOMIA 38/94 Rev.1) m/s Remark: Specifications subject to change without notice. *1: With propeller, with battery cable. *2: With Manual Start. *3: Transom angle is at -12° Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
  • Page 16 SPECIFICATIONS Service data Model MFS 6CZ, MFS 8C, MFS 9.9CY Item EF/EP EFT/EPT Unleaded Regular Gasoline : R+M/2: 87 or higher Fuel Garde RON: 91 or higher Fuel Tank Capacity L (US gal) 12 (3.15) Separate Grade API: SH, SJ, SL SAE: 10W-30, 10W-40 Engine Oil mL (US/Imp.oz)

  • Page 17: Parts Name

    PARTS NAME ENOM00820-0 MF, EF, EP ENOFA0017-1 Tilt Handle Thrust Rod Stop Switch *1 Top Cowl Clamp Bracket Stop Switch Lanyard *1 Bottom Cowl Clamp Screw Fuel Connector Cooling Water Check Port Tiller Handle *1 Starter Switch *2 Oil Drain Plug Throttle Grip *1 *1: Tiller handle type only *2: Electric starter type only...
  • Page 18 PARTS NAME ENOM00020-0 EFT, EPT ENOFA0018-1 Tilt Handle Trim Lock Pin Warning Lamp Top Cowl Clamp Bracket Stop Switch *1 Bottom Cowl Clamp Screw Stop Switch Lanyard *1 Cooling Water Check Port Tiller Handle *1 Fuel Connector Oil Drain Plug Throttle Grip *1 Starter Switch Anti-ventilation Plate...
  • Page 19 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 20: Label Locations

    LABEL LOCATIONS ENOM00019-A Warning label locations 2, 3 ENOF0019-1...
  • Page 21 LABEL LOCATIONS Read owner's manual. 5-4. ELECTRICAL SHOCK HAZARD High voltage can cause severe elec- trical shock. Do not touch electrical components such as ignition coil or spark plug ENOF00120-0 cord when star ting or while the Warning lamp (See page 32). engine is in operation.
  • Page 22 LABEL LOCATIONS ENOM00019-B CE label locations 1521 CAN ICES-2 / NMB-2 ENOF00020-1 1. Model code (Model name) 5. Manufacturer name 6. Manufacturer address 2. Serial No. 7. Authorised representative 3. Rated power 8. Authorised representative address 4. Dry mass weight( Without propeller, with battery cable) Description of serial number year code Last two digits of alphabet represent production year as below.

  • Page 23: Installation

    INSTALLATION ENOM00024-B ENOM00025-0 Mounting position 1. Mounting the outboard Place the outboard motor in the center motor on boat of the boat's transom. ENOW00006-1 WARNING Most boats are rated and certified for 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 24 INSTALLATION even swamping or capsizing. Make sure that there is enough distance between bottom cowl and water surface to prevent water from entering the engine. Make sure to mount the engine in correct position. If outboard motor is mounted incorrectly, water may intrude the engine from openings of the bottom cowl while ENOF00016-2 cruising.

  • Page 25: Battery Installation

    INSTALLATION ENOM00029-A 2. Battery installation ENOW00012-1 WARNING Battery electrolyte contains sulfuric acid and is hazardous, causes a burn if come in contact with your skin, and poisonous if swallowed. Keep batter y and electroly te away from reach of children. When handling the battery, be sure to: Read all warnings shown on the battery case.
  • Page 26 INSTALLATION 2. Connect the positive lead (+) to the ENOW00014-0 positive terminal (+) of the battery, CAUTION and then connect the negative lead Make sure that the battery leads do not (—). When disconnecting the battery, get stuck between the outboard motor always remove the negative lead (—) and boat when turning, etc.

  • Page 27: Pre-Operating Preparations

    When operating an outboard motor with The fuel system components on your gasoline containing ethanol, storing gasoline TOHATSU outboard motor will withstand in the fuel tank for long periods should be up to 10% ethyl alcohol (hereinafter avoided. Storing gasoline for long periods referred to as the "ethanol") content in...

  • Page 28: Fuel Filling

    PRE-OPERATING PREPARATIONS The static electricity may ignite the gaso- ENOW00018-1 line vapor during refueling. WARNING Stop the engine, and do not start the engine during refueling. Fuel leakage can cause fire or explosion, Do not smoke. potentially leading to severe injury or loss of Be careful not to overfill fuel tank.

  • Page 29: Engine Oil Filling

    PRE-OPERATING PREPARATIONS 1. Fully open the air vent screw on the ENOW00092-1 fuel tank cap and release internal CAUTION pressure. Do not overfill engine oil, or engine oil could leak and/or engine could be dam- aged. If engine oil level is over upper limit marks of oil level gauge, drain oil to level lower than upper limit.
  • Page 30 PRE-OPERATING PREPARATIONS ENOW0002A-A CAUTION Use of engine oils that do not meet these requirements will result in reduced engine life, and other engine problems. ENOF02511-0 1. Upper limit (Max.) 2. Lower limit (Min.) Engine oil recommendation Use only high quality 4-stroke outboard motor oil to insure performance and pro- longed engine life.

  • Page 31: Break-In

    PRE-OPERATING PREPARATIONS ENOM00033-A 4. Break-In Your new outboard motor and lower unit ENOW00023-1 require break-in for the moving compo- CAUTION nents a ccording to the conditions Operating the outboard motor without described in the following time table. break-in can shorten life. Please refer to ENGINE OPERATION sec- If any abnormality is experienced during the tion (See page 34) to learn how to cor-...

  • Page 32: Warning System

    PRE-OPERATING PREPARATIONS ENOM00039-C 5. Warning system If outboard motor encounters an abnor- mal condition of fault, the warning buzzer will emit a continuous beep or intermit- tent short beeps and the warning lamp (LED) will synchronize with the buzzer and engine speed will be limited (engine will ENOF00851-A not be stopped).
  • Page 33 In such the case, the buzzer sounds and the ESG is activated not to ignite the spark plug. Therefore, the engine speed varies and is controlled following specified engine speed. MFS 6CZ: 6200 min (rpm) MFS 8C, 9.9CY: 6400 min...

  • Page 34: Engine Operation

    ENGINE OPERATION disconne c t stop switch lock and crank ENOM00042-0 approximately 10 times in order to prime the Before starting oil pump. ENOM00246-0 ENOM00044-C Oil Level checking 1. Fuel feeding Check the engine oil level before each use. If the oil level is low or too high, the ENOW00029-1 life of the engine will be shortened sig- WARNING...

  • Page 35: Starting The Engine

    ENGINE OPERATION EF, MF type 4. Squeeze primer bulb until it becomes stiff to feed fuel to vapor separator. Point the arrow mark upward when priming. ENOF00862-0 1. Engine side ENOFA0072-1 2. Fuel tank side 1. Fuel connector 2. Push Do not squeeze primer bulb with engine 3.
  • Page 36 ENGINE OPERATION 2. Run at idling only ENON00010-1 Note 3. Remove the propeller (See page 72) Start-in-gear protection prevents the engine from starting at other than neutral shift. In-gear starting of engine will move the boat immediately, potentially leading to fall down or causing passenger(s) to be thrown overboard.
  • Page 37 ENGINE OPERATION (For electrical starter type) 3. Set the throttle grip to START posi- tion. 4. Push the starter switch button and release the button when the engine has started. ENOF01107-1 1. Throttle grip ENOFA0027-1 1. Starter Button 5. Confirm warning lamp light up and then lights out af ter engine has started.
  • Page 38 ENGINE OPERATION ENOF00870-1 1. Neutral (N) 2. Control lever ENOFA0028-1 3. Fully opened (Forward) 4. Fully opened (Reverse) Side mount RC type 5. Free throttle lever 6. Main switch key 1. Be sure to install the stop switch lock 7. Stop switch to the stop switch, and attach the 4.
  • Page 39 ENGINE OPERATION ENOM00042-F Emergency starting ENOW00099-1 WARNING When the emergency starter rope is used for starting engine; Start in gear protection does not work. Make sure that shift is in neutral position. If the gear is in Forward or Reverse, the boat can start moving immediately and may lead to accident and personal injury.
  • Page 40 ENGINE OPERATION 2. Remove starter lock cable from recoil starter by loosening the screw for the starter lock cable. ENOFA0032-1 ENOFA0030-1 5. Tie a loop in the another end of the 3. Remove the bolts (3 pcs) and remove emergency starter rope and attach the recoil starter.

  • Page 41: Warming Up The Engine

    ENGINE OPERATION 8. Pull the starter handle slowly until you ENOM00044-A Engine speeds feel engagement, keep pulling till you Idling speed after warming up. feel less resistance. Then pull it Clutch in (In gear) Clutch off (Out of gear) quickly. 900 min (rpm) 900 min...

  • Page 42: Forward, Reverse, And Acceleration

    ENGINE OPERATION ENOM00046-A ENOW00861-1 4. Forward, reverse, and WARNING acceleration Do not shift at high boat speed, or control may be lost, fall down or causing passen- ENOW00037-1 ger(s) to be thrown overboard. Leading to WARNING serious personal injury. Before shifting into forward or reverse, make ENOW00867-1 sure that boat is properly moored and out- WARNING...
  • Page 43 ENGINE OPERATION ENOM00890-C Tiller handle type ENOW00865-A CAUTION Do not force to shift when the throttle grip is not in the fully closed position, otherwise, steering system and/or shifting mechanism may be damaged. ENOF01109-1 1. Throttle grip ENOM0900-0 Side mount RC type ENOW00865-A CAUTION Do not force to shift when the throttle grip is...

  • Page 44: Stopping The Engine

    ENGINE OPERATION Forward boat to be thrown forward due to inertial force. 1. Quickly push the control lever to the Forward (F) position 32°, where the Tiller handle type gear is connected, while lifting up on 1. Turn the throttle grip to the slow the lock button located under the position.
  • Page 45 ENGINE OPERATION Side mount RC type Disconnect the battery cable, after each use. 1. Put the control lever in the Neutral position and run the engine for 2-3 Emergency engine stopping minutes at idling speed for cooling Remove stop switch lock to stop the down if it has been running at full engine.

  • Page 46: Steering

    ENGINE OPERATION When used as described, the emergency Left turn Turn the steering wheel to the left. stop switch clip and emergency stop switch lanyard system stops the engine if the operator is thrown overboard. When an operator falls into water, be sure to use spare emergency stop switch lock.
  • Page 47 ENGINE OPERATION ate the switch during while cruising, or ENOM00054-0 Improper trim angle (bow dips into the control of boat may be lost. water) Set the thrust rod (or preset knob) higher The trim angle of the outboard motor can if the bow of the boat is below horizontal.
  • Page 48 ENGINE OPERATION Remark: Thrust rod is for MF and EF, and 4. Change the trim lock pin position as preset knob is for EP . following picture. Trim angle adjustment (Manual tilt MF, EF type) The transom angle adjustment 1. Stop the engine. 2.

  • Page 49: Tilt Up And Down

    ENGINE OPERATION 6. Reinstall the trim lock pin securely. board motor in the fully tilted up while the boat is stored. 7. Operate the Power Tilt switch and tilt down the outboard. ENON00921-1 Note ENOM00060-A 8. Tilt up and down After use, leave the outboard motor upright for a minute to drain the water from inside the engine.
  • Page 50 ENGINE OPERATION ENOM00063-A Tilt down Slightly tilt the motor up, and pull the tilt lever toward you to release the tilt-lock. Then lower the motor slowly. ENOFA0040-1 1. Tilt up position 3. Set the knob to Lock position, then secure the tilt locking. ENOFA0039-1 1.
  • Page 51 ENGINE OPERATION 2. Lift up the outboard motor slightly until it is in Release position, and then outboard motor tilted down. ENOF01413-0 ENOFA0041-1 1. Tilt stopper 1. Tilt release position The outboard motor can also be tilted up ENOM00069-B and down using the switch provided on Power Tilt type the bottom cowl.

  • Page 52: Shallow Water Operation

    ENGINE OPERATION board motor will be tilted up when shifting in ENOW00053-0 reverse. CAUTION ENOW00873-1 While in shallow water drive position, do not operate the outboard motor in Reverse. WARNING Operate the outboard motor at slow speed and keep the cooling water intake sub- Before opening the manual relief valve, make merged.
  • Page 53 ENGINE OPERATION 3. Gently lower the outboard. ENOFA0044-1 1. Tilt release position ENOM00069-A Power Tilt type ENOFA0042-1 1. Operate the Power Tilt switch and tilt 1. Tilt lever the outboard motor up into desired 2. Shallow water running position shallow water running position. ENOM00541-A Manual tilt type (EP type) Shallow water running position...

  • Page 54: Removing And Carrying The Outboard Motor

    REMOVING AND CARRYING THE OUTBOARD MOTOR Fuel leakage is a fire or explosion hazard, ENOM00070-C which can cause serious injury or death. 1. Removing the outboard motor ENOW00065-1 WARNING ENOW00064-1 CAUTION Close air vent screw on fuel tank before car- rying or storing outboard motor and fuel Engine may be hot immediately after opera- tank, or fuel may leak, potentially catching...

  • Page 55: Trailering

    REMOVING AND CARRYING THE OUTBOARD MOTOR ENOF00075-1 ENOW00068-0 WARNING Close air vent screw of fuel tank and fuel cock before carrying or storing outboard motor and fuel tank, or fuel may leak, poten- ENOFA0046-1 tially catching fire. ENON00021-3 Note ENOWA0003-1 If the outboard motor must be laid down, CAUTION be sure that fuel is completely drained,...
  • Page 56 REMOVING AND CARRYING THE OUTBOARD MOTOR ENOF00074-B 1. Ground clearance should be provided sufficiently. 2. Transom saver bar ENOW00067-0 WARNING Do not go under outboard motor tilted up even if it is supported by support bar, or accidental fall of outboard motor could lead to severe personal injury.

  • Page 57: Adjustment

    ADJUSTMENT EFT type ENOM00073-0 1. Steering friction Tiller handle type ENOW00977-0 WARNING Do not overtighten the steering friction bolt or lever, it could result in difficult handling of the outboard motor, resulting in the loss of control causing an accident and could lead to severe injury.

  • Page 58: Remote Control Lever Friction

    ADJUSTMENT ENOM00075-0 ENOM00076-0 3. Remote control lever friction 4. Trim tab adjustment EP, EPT type ENOW00076-1 ENOW00074-1C WARNING WARNING Be sure that the outboard motor is secured to transom or service stand, or Do not over tighten the remote control accidental drop or fall of outboard motor throttle friction adjustment screw or it could lead to severe personal injury.
  • Page 59 ADJUSTMENT ENOF02449-0 1. Trim tab ENON00022-A Notes After adjustment securely tighten the trim tab fixing bolt. Check for looseness of the bolt and the trim tab at regular intervals.

  • Page 60: Inspection And Maintenance

    INSPECTION AND MAINTENANCE ENOM00077-1 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 as follows. ENOW00077-1 CAUTION Your personal safety and that of your pas- sengers depends on how well you main-...

  • Page 61: Daily Inspection

    INSPECTION AND MAINTENANCE ENOM00322-1 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 62 INSPECTION AND MAINTENANCE Item Points to Check Remedy • Make sure that steering handle and remote control is Repair Steering Devices functioning normally. • Check if the anode is securely installed. Repair if necessary Other parts • Check the anode for corrosion and deformation. Replace ENOM00081-D Oil level checking...
  • Page 63 INSPECTION AND MAINTENANCE Wipe off engine oil well immediately if ENOM00085-E Flushing hose joint spilled and dispose of it in accordance ENOW00921-0 with local fire prevention and environ- ment protection regulations. CAUTION Do not replenish engine oil over upper limit. If overfilled, remove oil to upper Do not operate the engine when flushing the limit.
  • Page 64 INSPECTION AND MAINTENANCE ENOM00085-A ENOM01903-A Flushing by test tank Gear case flushing device ENOW00081-1 ENOW00082-0 WARNING WARNING Do not start engine without removing pro- Never start or operate the engine indoors or peller, turning propeller out in the open may in any space which is not well ventilated.
  • Page 65 If the fuse continues to blow, request an authorized Tohatsu dealer to inspect the outboard motor. 1. Stop the engine and disconnect the battery cable from the battery nega-...

  • Page 66: Periodic Inspection

    INSPECTION AND MAINTENANCE ENOM00555-1 2. Periodic Inspection It is important to inspect and maintain your outboard motor regularly. Make sure to per- form each service at interval specified in the chart below. Maintenance intervals are determined by the number of hours outboard motor has been used or number of months, whichever comes first.
  • Page 67 Frequent stop and start operation Frequent shifting operation Frequent operation in acidic, polluted, muddy, sandy, or shallow water Appropriate maintenance can prolong your engine life. Consult your Tohatsu authorized dealer for suitable maintenance interval depending on operating and environmental conditions.
  • Page 68 INSPECTION AND MAINTENANCE 2. Tilt up the outboard motor and lock ENOM00091-C Engine oil replacement the tilt with tilt stopper. ENOW00091-1 3. Put an oil drain pan under the oil drain CAUTION bolt. 4. Remove the oil drain bolt and com- You may be injured due to high engine tem- pletely drain oil from the engine.
  • Page 69 INSPECTION AND MAINTENANCE 12. Start the engine and idling for 5 minu- fire prevention and environment protection regulations. ets, then check for no oil leaks and no warning indicate. ENON00031-0 Note If any amount of water is found in engine oil, making it milky white, consult dealer.
  • Page 70 INSPECTION AND MAINTENANCE In case of debris ENOM00094-0 Fuel filter (for engine) 1. If present, disconnect hoses from the fuel connector (male) and the fuel pump. 2. Remove the cup, filter and O-rings from the fuel filter body. 3. Check the wear and clogging for each parts, and replace if necessary.
  • Page 71 INSPECTION AND MAINTENANCE 1. Remove the fuel pickup elbow of the of outboard motor could lead to severe personal injury. fuel tank by turning it counterclock- wise 1. Tilt down the outboard motor. 2. Clean the fuel filter and check the O- 2.
  • Page 72 INSPECTION AND MAINTENANCE ENOW00928-1 CAUTION If gear oil is spilled, wipe off immediately and dispose according to the local regulations. ENON00032-1 Note If the gear oil color appears to be milky color, contact your dealer. ENOM00086-A Propeller replacement ENOW00084-1 ENOF01430-0 WARNING 4.
  • Page 73 INSPECTION AND MAINTENANCE 1. Put a piece of wood block between Propeller nut torque: propeller blade and anti-ventilation 12 N·m (9 ft · lb, 1.2kgf · plate to hold propeller. 7. Install a new split pin into the nut hole and bend both ends of pin apart to lock propeller in place.
  • Page 74 INSPECTION AND MAINTENANCE 3. Remove the spark plug caps. ment to the correct torque as soon as possible with a torque-wrench. 4. Remove the spark plugs by turning it counter-clockwise, using a 5/8" (16 mm) socket wrench and handle that are provided in the tool bag.
  • Page 75 INSPECTION AND MAINTENANCE ENOM00088-1A Anode replacement A sacrificial anode protects the outboard motor from galvanic corrosion. Anode is located on the gear case, cylinder etc.. When the anode is eroded more than 1/3 of original size, replace it. ENON00029-1 Notes Never grease or paint the anode.
  • Page 76 INSPECTION AND MAINTENANCE ENOM01827-0 ENOM00089-B Ground wire checking Power Tilt oil checking The ground wires described below are ENOW00088-0 making electrically connection between WARNING moving parts and sacrificial anodes to Be sure that outboard motor is secured to prevent galvanic corrosion. transom or service stand, or accidental Inspect the wires and their terminals drop or fall of outboard motor could lead...
  • Page 77 INSPECTION AND MAINTENANCE Recommended oil Use automatic transmission fluid or equivalent. Recommended oil is as shown below. ATF Dexron III Air purging from the Power Trim and Tilt unit. Trapped air in the Power Tilt unit will cause poor tilting movement and noise. 1.
  • Page 78 INSPECTION AND MAINTENANCE ENOM00960-1 Grease point Apply waterproof grease to the parts shown below. ENOFA0058-1...

  • Page 79: Off-Season Storage

    INSPECTION AND MAINTENANCE 2. Remove the fuel hose from the out- ENOM00100-A 3. Off-season storage board motor. 3. Drain all fuel from the fuel hoses, fuel ENOW00934-0 pump, fuel filter and vapor separator WARNING (See page 80), and clean these parts. Keep in mind that if gasoline is kept in Be sure to disconnect fuel connector the vapor separator for a long time,...
  • Page 80 INSPECTION AND MAINTENANCE 9. Place the outboard motor in the ver- tical position under a dry condition. ENOF00047-1 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 81 INSPECTION AND MAINTENANCE Fuel and fuel vapors are extremely flamma- ble and can be explosive. If fuel is spilled, wipe it up immediately. Keep the fuel tank well away from sources of ignition, e.g. sparks or open flames Perform all work outdoors or in a well ventilated place.

  • Page 82: Pre-Season Check

    INSPECTION AND MAINTENANCE 9. Run the engine for 10 minutes at half ENOM00104-A 4. Pre-season check throttle. The oil used for storage inside the engine will be circulated The following steps must be taken when out to assure optimum performance. first using the engine after off-season ENOM00105-A storage.

  • Page 83: Cold Weather Precautions

    INSPECTION AND MAINTENANCE ENOM00106-1 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), water When the auxiliary outboard motor is not residue in water pump may freeze and in operation, be sure to remove the stop may damage the pump, impeller, etc.

  • Page 84: Troubleshooting

    TROUBLESHOOTING ENOM00108-1 If you encounter a problem, check the 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 Fuel level is low in the tank. Fuel system connection is incomplete.
  • Page 85 TROUBLESHOOTING Possible cause Defective wiring, ground, wire disconnected or loosened. Use of spark plugs not specified. Spark plug is contaminated. No sparks or weak spark. Stop switch short-circuited. Stop switch lock is not installed correctly. Battery charging defective, or rectifier malfunctions.
  • Page 86 TROUBLESHOOTING Possible cause Low compression Valve timing is not correct (Belt is stretched or installed incorrectly). Valve clearance is defective. Valve seat sealing is defective. Piston, piston ring and/or cylinder is worn excessively. Too much carbon deposition in the combustion chamber. Spark plug tightening is loose.
  • Page 87 ACCESSORIES KIT ENOM00562-1 The followings are a list of the tools and spare parts provided with the motor. Items Quantity Remark Tool bag Pliers Socket wrench 10 × 13 mm Service tools Socket wrench 16 mm (spark plug) Socket wrench handle Screwdrivers Cross-and straight-point Screwdriver handle...
  • Page 88 Except for propeller came with outboard motor, propellers listed above are optional. Please consult your dealer to select the best propeller for your boat if the standard propeller does not match. Full Throttle Operating Range MFS 6CZ: 5000 - 6000 min (rpm) MFS 8C/9.9CY: 5300 - 6200 min (rpm)
  • Page 89 INSPECTION & MAINTENANCE LOG Date Engine Hour Inspection/Maintenance Performed Performed by...
  • Page 90 O W N E R’ S M A N U A L MFS 6CZ MFS 8C MFS 9.9CY 5-4, Azusawa 3-Chome, Itabashi-Ku Tokyo 174-0051, Japan Tel: +81-3-3966-3117 Fax: +81-3-3966-2951 www.tohatsu.com...

This manual is also suitable for:

Mfs 8cMfs 9.9cy

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