TOHATSU MFS 8C Owner's Manual
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TOHATSU MFS 8C Owner's Manual

TOHATSU MFS 8C Owner's Manual

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O W N E R' S
M A N U A L
AAAA
MFS 8C
MFS 9.8C
OB No.003-11176-0BD1

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Summary of Contents for TOHATSU MFS 8C

  • Page 1 O W N E R’ S M A N U A L AAAA MFS 8C MFS 9.8C OB No.003-11176-0BD1...
  • 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 11. TROUBLESHOOTING ..........84 12.
  • 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 14.

  • 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 8C MFS 9.8C Type Transom heights Tiller handle Remote control Power Tilt Manual Tilt White model only ENOM00811-A MODEL NAME EXAMPLE MFS 9.8C EPTL Model Horse Product Starter Steering Shaft Tilt system description power...
  • 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 SPECIFICATIONS Service data Model MFS 8/9.8C Item Unleaded Regular Gasoline : R+M/2: 87 or higher Fuel Grade 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) 800 (27/28) Grade...

  • Page 15: 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 16 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 17 PARTS NAME ENOM00822-0 Remote control box & Fuel tank ENOF01404-A2 Control Lever Air vent screw Neutral lock arm Fuel tank cap PT 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 18: Label Locations

    LABEL LOCATIONS ENOM00019-A Warning label locations 2, 3 ENOF0060-1...
  • Page 19 LABEL LOCATIONS 1, 6-4. Read owner's manual. 6-1. Hot surface. 6-2. Hazard caused by rotating parts. 6-3. Electrical shock hazard. 3WL-72180-0 Warning lamp (See page 31). ENOF00130-0 Engine stop switch (See page 36, 37, 44, 45). 3NV-72181-1 Engine stop switch warning. ENOF00131-B When laying down the outboard motor, be sure this decal is facing up.
  • Page 20 LABEL LOCATIONS Warning regarding fuel tank cap (See Warning tag regarding instructions of page 27). the fuel tank cap (See page 27). ENOF00012-0 Warning tag regarding combination of fuel tank and primer bulb ass'y (See ENOF00011-0 page 33). Warning regarding gasoline (See page 27).
  • Page 21 ENOFA0061-1 w PRODUCTION MONTH EPA Emissions Regulations The Emission Control Information label Outboards sold by Tohatsu America Cor- was affixed to engines as permanent evi- poration in the United States are certi- dence of EPA certification. fied to the United States Environmental...

  • Page 22: 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 23 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 24: 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 25: Altitude Adjustment Kit Installation

    Specifications and features of battery vary fuel efficiency and performance. Contact by manufacturers. authorized Tohatsu dealer for more Consult the manufacturer for details. * The battery should be purchased sepa- detail. rately and is not supplied with the out- board motor.

  • Page 26: 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 27: 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 28: 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 29 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 30: 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 33) to learn how to cor-...

  • Page 31: 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 32 PRE-OPERATING PREPARATIONS ENOM00041-F Warning indicators, faults and remedy Warning indicators High Description of faults Remedy Sound Lamp (LED) speed speed One beep On for 5 sec. Normal system test when start up Engine speed exceeds maximum Continuous allowable RPM Continuous Low oil pressure Continuous Water over temperature...

  • Page 33: 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 34 ENGINE OPERATION wise fuel spillage may occur when the con- EF, MF type nector is connected to the engine. ENOF00036-0 Do not connect fuel connector except when operating engine. Fuel leakage is a fire or explosion hazard, which can cause serious injury or death.

  • Page 35: Starting The Engine

    ENGINE OPERATION 4. Squeeze primer bulb until it becomes 2. Run at idling only 3. Remove the propeller stiff to feed fuel to vapor separator. (See page 72) Point the arrow mark upward when priming. ENOF00862-0 1. Engine side 2. Fuel tank side ENOF00863-0 1.
  • Page 36 ENGINE OPERATION 3. Set the throttle grip to START posi- ENON00010-1 Note tion. 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) 4. Push the starter switch button and release the button when the engine has started. ENOFA0028-1 Side mount RC type 1. Be sure to install the stop switch lock to the stop switch, and attach the ENOFA0027-1 stop switch lanyard securely to the operator or to the operator's PFD...
  • Page 38 ENGINE OPERATION ENOF00870-1 1. Neutral (N) 2. Control lever ENOFA0022-1 3. Fully opened (Forward) 4. Fully opened (Reverse) 1. Warning lamp 5. Free throttle lever 6. Main switch key 7. Stop switch 4. Turn the main switch key to ON posi- tion.
  • Page 39 ENGINE OPERATION 2. Remove starter lock cable from recoil ENOM00042-F Emergency starting starter by loosening the screw for the ENOW00099-1 starter lock cable. 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.

  • Page 40: Warming Up The Engine

    ENGINE OPERATION 8. Pull the starter handle slowly until you feel engagement, keep pulling till you feel less resistance. Then pull it quickly. 9. Once the outboard motor is started, do not reinstall the recoil starter and top cowl. ENOM00043-A 3.

  • Page 41: Forward, Reverse, And Acceleration

    ENGINE OPERATION ENOM00044-A ENOM00046-A Engine speeds 4. Forward, reverse, and Idling speed after warming up. acceleration Clutch in (In gear) Clutch off (Out of gear) 900 min (rpm) 900 min (rpm) ENOW00037-1 WARNING ENOM00972-1 Free throttle lever (Side mount RC Before shifting into forward or reverse, make type) sure that boat is properly moored and out-...
  • Page 42 ENGINE OPERATION ENOW00861-1 ENOM00890-C Tiller handle type WARNING ENOW00865-A Do not shift at high boat speed, or control CAUTION may be lost, fall down or causing passen- ger(s) to be thrown overboard. Leading to Do not force to shift when the throttle grip is serious personal injury.

  • Page 43: Stopping The Engine

    ENGINE OPERATION Forward 1. Quickly push the control lever to the Forward (F) position 32°, where the gear is connected, while lifting up on the lock button located under the control lever grip. 2. Further forward motion will open the throttle.
  • Page 44 ENGINE OPERATION boat to be thrown forward due to inertial Side mount RC type force. 1. Put the control lever in the Neutral position and run the engine for 2-3 Tiller handle type minutes at idling speed for cooling 1. Turn the throttle grip to the slow down if it has been running at full position.

  • Page 45: Steering

    ENGINE OPERATION Disconnect the battery cable, after each motor. use. When used as described, the emergency stop switch clip and emergency stop Emergency engine stopping switch lanyard system stops the engine if Remove stop switch lock to stop the the operator is thrown overboard. When engine.

  • Page 46: Trim Angle

    ENGINE OPERATION Remote control type For outboard motor model with PT or PTT switch on the bottom cowl, do not oper- Right turn ate the switch during while cruising, or Turn the steering wheel to the right. control of boat may be lost. Left turn Turn the steering wheel to the left.
  • Page 47 ENGINE OPERATION Remark: Thrust rod is for MF and EF, and ENOM00054-0 Improper trim angle (bow dips into the preset knob is for EP . water) Set the thrust rod (or preset knob) higher Trim angle adjustment (Manual tilt MF, if the bow of the boat is below horizontal.

  • Page 48: Tilt Up And Down

    ENGINE OPERATION 4. Change the trim lock pin position as 6. Reinstall the trim lock pin securely. following picture. 7. Operate the Power Tilt switch and tilt down the outboard. ENOM00060-A 8. Tilt up and down ENOW00055-1 WARNING Do not tilt the outboard motor up or down when swimmer(s) and/or passenger(s) are near to prevent them from being caught ENOF01425-0...
  • Page 49 ENGINE OPERATION board motor in the fully tilted up while the ENOM00063-A Tilt down boat is stored. Slightly tilt the motor up, and pull the tilt lever toward you to release the tilt-lock. ENON00921-1 Note Then lower the motor slowly. After use, leave the outboard motor upright for a minute to drain the water from inside the engine.
  • Page 50 ENGINE OPERATION 2. Lift up the outboard motor slightly until it is in Release position, and then outboard motor tilted down. ENOFA0040-1 1. Tilt up position 3. Set the knob to Lock position, then ENOFA0041-1 secure the tilt locking. 1. Tilt release position ENOM00069-B Power Tilt type Tilt up...

  • Page 51: Shallow Water Operation

    ENGINE OPERATION board motor will be tilted up when shifting in reverse. ENOW00873-1 WARNING Before opening the manual relief valve, make sure nobody is under the outboard motor. If the outboard motor is in the tilted upposi- tion with the manual relief valve loosend, the outboard motor will be tilted down suddenly.
  • Page 52 ENGINE OPERATION ENOW00053-0 CAUTION While in shallow water drive position, do not operate the outboard motor in Reverse. Operate the outboard motor at slow speed and keep the cooling water intake sub- merged. ENOW00054-1A CAUTION Do not over tilt the outboard motor when driving in shallow water, or air may be sucked through water inlet, potentially leading to ENOFA0042-1...
  • Page 53 ENGINE OPERATION Return to normal running position 1. Stop the engine. 2. Tilt the outboard up to the tilt release position. 3. Gently lower the outboard. ENOFA0044-1 1. Tilt release position ENOM00069-A Power Tilt type 1. Operate the Power Tilt switch and tilt the outboard motor up into desired shallow water running position.

  • Page 54: Removing And Carrying The Outboard Motor

    REMOVING AND CARRYING THE OUTBOARD MOTOR ENOM00070-C ENOW00065-1 1. Removing the outboard WARNING motor Close air vent screw on fuel tank before car- rying or storing outboard motor and fuel ENOW00064-1 tank, or fuel may leak, potentially catching CAUTION fire. Engine may be hot immediately after opera- ENOW00066-1 tion and could cause burns if came in con-...

  • 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 ENOFA0046-1 motor and fuel tank, or fuel may leak, poten- ENON00021-3 tially catching fire. Note ENOWA0003-1 If the outboard motor must be laid down, be sure that fuel is completely drained, CAUTION...
  • 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-A 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 ENOF01420-C If the fuse continues to blow, request an 1. Gear case flushing device authorized Tohatsu dealer to inspect the outboard motor. 5. Place the shift lever in the neutral 1. Stop the engine and disconnect the...

  • 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 ENOM00091-C ENOM00565-0 Engine oil replacement To change engine oil: Be sure to use recommended engine oil. ENOW00091-1 1. Stop the engine and leave it in a verti- CAUTION cal position over 5 minutes. You may be injured due to high engine tem- 2.
  • Page 69 INSPECTION AND MAINTENANCE 10. Leave the outboard motor for 5 min- Approximately 800 mL (27 US fl oz, 28 imp fl oz) utes and check oil level on the dip- ENOW00925-0 stick. Add oil if necessary. CAUTION 11. Insert the dipstick to the hole com- pletely and install the top cowl.
  • 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 4.
  • Page 73 INSPECTION AND MAINTENANCE 1. Put a piece of wood block between 6. Tighten the propeller nut to specified propeller blade and anti-ventilation torque and align one of the grooves plate to hold propeller. with propeller shaft hole. Propeller nut torque: 12 N·m (9 ft ·...
  • Page 74 INSPECTION AND MAINTENANCE 1. Stop the engine. ment to the correct torque as soon as possible with a torque-wrench. 2. Remove the top cowl. 3. Remove the spark plug caps. 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 ENOFA0046-1 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

    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: Propeller Table

    Consult your dealer for selecting optional propeller. Propeller Size Standard Propeller Propeller Number of (Diameter × Pitch) Load Mark Blades inch MFS 8C MFS 9.8CY Light F9.5 8.9 × 10 226 × 255 F8.5 8.9 × 8.3 226 × 211 8.5 × 7.5 216 ×...

  • Page 89: Emission Control System Information

    EMISSION CONTROL SYSTEM INFORMATION ENOM01000-0 ENOM01003-0 Emission Sources Clean Air Acts of the United States and California, and Environment Canada Carbon monoxide, oxides of nitrogen and EPA, California, and Canadian regulations hy drocarbons are produce d in the require all manufacturers to provide writ- course of the combustion process.
  • Page 90 ENOM01006-0 Replacement Parts 2011. The emission control system in your Tohatsu out board motor has be en designed, built, and certified to conform with the EPA and California emission reg- ulations. Whenever requesting mainte- nance, use of Tohatsu Genuine parts is highly recommended.
  • Page 91 EQUIPPED FOR UNITED STATES AND CANADA MODEL CANADA MODEL The Environmental Protect ion Agency TOHATSU adopts Primer bulb/hose (EPA) required portable fuel systems that assembly approved by the Environment are produced after January 1, 2011 for use Protection Agency (EPA).
  • Page 92 EMISSION CONTROL SYSTEM INFORMATION label identifies engines that meet the Air ENOM01007-0 Maintenance Resources Board’s Personal Watercraft and Out board marine engine 2001 Follow the maintenance schedule pre- exhaust emission standards. sented on page 70. Keep in mind that this Engines meeting these standards have schedule is based on the assumption that 75% lower emissions than conventional...
  • Page 93 EMISSION CONTROL SYSTEM INFORMATION Sterndrive and Inboard marine engine 2003-2008 exhaust emission standards. Engines meeting these standards have 65% lower emissions than One Star-Low Emission engines. ENOF01004-0 ENOM01012-0 Four Stars-Super Ultra Low Emission The four-star label identifies engines that meet the Air Resources Board’s Stern- drive and Inboard marine engine 2009 exhaust emission standards.
  • Page 94 O W N E R’ S M A N U A L MFS 8C MFS 9.8C 5-4, Azusawa 3-Chome, Itabashi-Ku Tokyo 174-0051, Japan Tel: +81-3-3966-3117 Fax: +81-3-3966-2951 www.tohatsu.com...

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Mfs 9.8c

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