TOHATSU MFS 6BZ Owner's Manual
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TOHATSU MFS 6BZ 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 6BZ
MFS 8B
MFS 9.8B
OB No.003-11113-6AK1

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Summary of Contents for TOHATSU MFS 6BZ

  • 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 6BZ MFS 8B MFS 9.8B OB No.003-11113-6AK1...
  • 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 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 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 clamp bracket or swivel 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 thoroughly read and understand this Owner's Manual and carefully follow all of the instructions. Of particular importance is information preceded by the words “DAN- GER,” “WARNING,” “CAUTION,” and “Note.” Always pay special attention to such information to ensure safe operation of the outboard motor at all times.

  • Page 7: Table Of Contents

    CONTENTS 1. GENERAL SAFETY INFORMATION ........10 2.
  • Page 8 11. TROUBLESHOOTING ..........83 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...

  • 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 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 F9.8B Type Transom heights Tiller Handle Remote Control Power Tilt Manual tilt *1: Option ENOM00811-A MODEL NAME EXAMPLE F 9.8B EPTL Model Horse Product Starter Steering Shaft Tilt system description power generation system system length T= Power P=Remote control S= Short 15 in...
  • Page 13 (ICOMIA 39/94) dB (A) Hand Vibration Level — (ICOMIA 38/94) m/s Remark: Specifications subject to change without notice. *1 With propeller, with battery cable. *2 With Manual Start Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
  • Page 14 (ICOMIA 39/94) dB (A) Hand Vibration Level — (ICOMIA 38/94) m/s Remark: Specifications subject to change without notice. *1 With propeller, with battery cable. *2 With Manual Start Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
  • Page 15 (ICOMIA 39/94) dB (A) Hand Vibration Level — (ICOMIA 38/94) m/s Remark: Specifications subject to change without notice. *1 With propeller, with battery cable. *2 With Manual Start Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).

  • Page 16: Parts Name

    PARTS NAME ENOM00820-0 MF, EF, EP ENOF01402-1 Tilt Handle Splash Plate Stop Switch *1 Top Cowl Thrust Rod Stop Switch Lanyard Bottom Cowl Clamp Bracket Choke Knob Cooling Water Check Port Clamp Screw Fuel Connector Oil Drain Plug Tiller Handle *1 Starter Switch *2 Water Plug Throttle Grip *1...
  • Page 17 PARTS NAME ENOM00020-0 EFT, EPT ENOF01403-1 Tilt Handle Splash Plate Stop Switch *1 Top Cowl Trim Lock Pin Stop Switch Lanyard Bottom Cowl Clamp Bracket Choke Knob Cooling Water Check Port Clamp Screw Fuel Connector Oil Drain Plug Tiller Handle *1 Starter Switch Water Plug Throttle Grip *1...
  • Page 18 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 19: Label Locations

    LABEL LOCATIONS ENOM00019-A Warning label locations 2, 3 ENOF01405-3...
  • Page 20 LABEL LOCATIONS 5-1. Warning regarding emergency Warning label regarding installation of starting (See page 39). remote control system (See page 25). 5-2. Warning regarding high tempera- ture. 5-3. Warning regarding rotating object. 5-4. Warning regarding high voltage ENOF00120-0 Warning label regarding oil pressure (See page 32).
  • Page 21 LABEL LOCATIONS Warning regarding gasoline (See page 29). ENOF00005-L...
  • Page 22 LABEL LOCATIONS ENOM00019-B CE label locations MF/EF model Outboard Motor Rated Power: 0123 Mass: Serial No. Made in Japan CAN ICES-2/NMB-2 ENOF01406-2 EP/EFT/EPT model Outboard Motor Rated Power: 0123 Mass: Serial No. Made in Japan CAN ICES-2/NMB-2 ENOF01406-3 1. Model code (Model name) 2.

  • Page 23: 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 24 INSTALLATION 4. Secure the outboard motor to the boat with a rope to prevent acciden- tal loss of the outboard motor over- board. ENON00930-0 5−25 mm Note (0.2−1 in) Do not use tools to tighten clamp screws. Over tightening could result in damage to ENOF01408-1 the clamp screws and clamp brackets.

  • Page 25: Remote Control Device Installation

    INSTALLATION Tighten the bolts sufficiency, otherwise falling down of outboard could be hap- pened. ENON00003-1 Notes Apply sealing agent, such as silicone sealed between the bolts and the transom board holes before tighten- ing the bolts. 2. Be sure to tighten the mounting bolt nuts to the specified torque.

  • Page 26: Battery Installation

    INSTALLATION Make sure there are no obstacles that ENOM00029-A 3. Battery installation can interfere with the operation of the remote control cable. ENOW00012-0 WARNING ENOW00850-0 Remote control cable length Battery electrolyte contains sulfuric acid ENOW00100-A and thus is hazardous, causing a burn if it CAUTION comes in contact with your skin, or poison- ous if swallowed.
  • Page 27 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 28: Pre-Operating Preparations

    TOHATSU engine will withstand up to CAUTION 10% ethyl alcohol (hereinafter referred When operating a TOHATSU engine on gaso- to as the "ethanol"), content in the gaso- line containing alcohol, storage of gasoline line. But even if the gasoline in your area...

  • Page 29: Fuel Filling

    PRE-OPERATING PREPARATIONS phase separation to take place. In addition, Be sure to remove the static electricity internal corrosion may take place during charged in your body before refueling. storage if alcohol has washed protective oil The sparks due to static electricity may films from internal components.

  • Page 30: Engine Oil Recommendation

    PRE-OPERATING PREPARATIONS 1. Full open the air vent screw on the fuel tank cap and release internal pressure. ENOF01409-0 Use only high quality 4-stroke engine oil ENOF00417-1 to insure performance and prolonged 1. Air vent screw engine life. 2. Fuel tank cap The SAE oil viscosity 10W-30 or 10W-40 FC-W outboard motor engine oil is rec- 2.

  • Page 31: 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 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 intermittent short beeps and the warn- ing lamp (LED) will synchronize with the buzzer and engine speed will be limited ENOF00851-A (engine will not be stopped).
  • Page 33 PRE-OPERATING PREPARATIONS ENOM00041-C Warning indicators, faults and remedy Warning indicators Description of faults Remedy Sound Lamp (LED) (EPT only) On for several Normal system test when start up sec. Engine speed exceeds maximum High speed ESG allowable RPM Continuous Low speed ESG Low oil pressure Remarks *1: In this case, oil pressure switch is “ON”.
  • Page 34 PRE-OPERATING PREPARATIONS Remedy Reduce the throttle to less than half opening, and move to safe place quickly, and stop the engine. Check the propeller for bent or dam- aged blades. Consult an authorize d de aler if engine shows the same result even after replacing propeller with new one.

  • Page 35: Engine Operation

    ENGINE OPERATION tank is raised by heat from sources such as ENOM00042-0 sun light. Before starting ENOW0947-0 ENOW00022-A CAUTION CAUTION When using a separate tank, be sure that the The engine oil is drained for shipping from fuel line is not kinked and is connected the factory.

  • Page 36: Starting The Engine

    ENGINE OPERATION ENOF00861-A 1. Pull ENOF00863-0 2. Insert 1. Test tank 4. Squeeze primer bulb until 2. Water 3. Over 10 cm (4 in.) becomes stiff to feed fuel to carbu- retor. Direct arrow mark upward when priming. ENOW00036-0 CAUTION Be sure to stop engine immediately if cooling water check port is not discharging water, and check if cooling water intake is blocked.
  • Page 37 ENGINE OPERATION Tiller handle type 1. Be sure to install the stop switch lock to the stop switch, and attach the stop switch lanyard securely to the operator or to the operator's PFD (Personal Flotation Device.) ENOF00518-0 1. Choke knob ENON00501-0 Note Choke is not necessary when the engine is...
  • Page 38 ENGINE OPERATION (For electrical starter type) Side mount RC type 5. Push the starter switch button and 1. Be sure to install the stop switch lock release the button when the engine to the stop switch, and attach the has started. stop switch lanyard securely to the operator or to the operator's PFD (Personal Flotation Device.)
  • Page 39 ENGINE OPERATION 1. Warning lamp ENON00035-A Note 9. Check the cooling water from cool- The free throttle lever can not be raised ing water check port. when the control lever shift is in Forward or Reverse. 5. Turn the main switch key to ON posi- tion.
  • Page 40 ENGINE OPERATION 1. Remove the top cowl. ENOF01435-0 ENOF00521-1 5. Tie a loop in the another end of the 2. Remove starter lock cable from emergency starter rope and attach recoil starter by loosening the screw socket wrench that is included in the for the starter lock cable.

  • Page 41: Warming Up The Engine

    ENGINE OPERATION After engine starts, do not reinstall ENOM00043-A 3. Warming up the engine flywheel cover and top cowl. ENOM00518-0 ENOW00932-0 If the choke solenoid fails to CAUTION operate (EP and EPT type only) Be sure to check that cooling water is com- ing out of the cooling water check port dur- 1.

  • Page 42: Forward, Reverse, And Acceleration

    ENGINE OPERATION ENOM00972-0 ENOW00038-A Free throttle lever (Side mount WARNING RC type) Attach other end of emergency stop ENOW00956-0 switch lanyard to the operator's PFD CAUTION (Personal Flotation device) or arm and keep it attached during cruising. Keep the free throttle lever fully closed- Do not attach the tether to a part of position when start the engine.
  • Page 43 ENGINE OPERATION ENOW00863-0 Forward CAUTION 1. Turn the throttle grip to reduce Idle speed may be higher during warming up engine speed. of engine. If shifted to Forward or Reverse 2. When the engine reaches trolling (or during warming up, it may be difficult to idling) speed, quickly pull the shift shift back to neutral.

  • Page 44: Stopping The Engine

    ENGINE OPERATION Reverse ENOM0900-0 Side mount RC type 1. Quickly pull the control lever to the ENOW00867-0 Reverse (R) position at 32°, where WARNING the gear is connected, while lifting up on the lock button located under Sudden acceleration and deceleration may the control lever grip.
  • Page 45 ENGINE OPERATION Tiller handle type 1. Turn the throttle grip to the slow position. ENOF00881-1 1. Control lever 2. Main switch key ENOF01107-0 2. Turn the main switch key to the OFF 1. Throttle grip position or push the stop switch. ( Do not forget to turn the key off).

  • Page 46: Steering

    ENGINE OPERATION Emergency engine stopping Remove stop switch lock to stop the engine. ENOF00891-0 ENOM00920-0 6. Steering ENOW00870-0 WARNING ENOF00569-C Sudden steering may cause passenger(s) to be thrown overboard or falling down. Tiller handle type Right turn Move the tiller handle to the left Left turn Move the tiller handle to the right.

  • Page 47: Trim Angle

    ENGINE OPERATION The trim angle of the outboard motor can be adjusted to suit the transom angle of the hull, and load conditions. Choose an appropriate trim angle that will allow the anti-ventilation plate to run parallel to the water surface during operation.
  • Page 48 ENGINE OPERATION Trim angle adjustment (Manual tilt MF, EF type) The transom angle adjustment 1. Stop the engine. 2. Shift into neutral position. 3. Tilt up the outboard motor. 4. Remove the thrust rod as shown pic- ture. ENOF00053-0 ENOF01238-1 ENOF00532-0 1.

  • Page 49: Tilt Up And Down

    ENGINE OPERATION 4. Change the trim lock pin position as 2. Higher 3. Lower following picture. 5. Reinstall the tilt lock pin securely. 6. Operate the Power Tilt switch and lower the outboard. ENOM00060-A 8. Tilt up and down ENOW00055-0 WARNING ENOF01425-0 1.
  • Page 50 ENGINE OPERATION ENON00921-0 ENOM00063-A Tilt down Note Slightly tilt the motor up, and pull the Before tilting the outboard motor up, tilt lever toward you to release the tilt- after stopping the motor leave it in the lock. running position for about a minute to allow water to drain from inside the Then lower the motor slowly.
  • Page 51 ENGINE OPERATION 2. Lift up the outboard motor slightly until it is in Release position, and then outboard motor tilted down. JNOF01403-1 1. Tilt up position JNOF01406-1 1. Tilt release position 3. Set the knob to Lock position, then secure the tilt locking. ENOM00069-B Power Tilt type Tilt up...

  • Page 52: Shallow Water Operation

    ENGINE OPERATION board motor will tilt up when operated in reverse. ENOW00873-0 WARNING Before opening the manual relief valve, make sure nobody is under the outboard motor. If the outboard motor is in the tilted up position, it will tilt down suddenly if the manual relief valve is loosened in the "Man- ual"...
  • Page 53 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-A CAUTION Do not overtilt outboard motor when driving shallow water, or air may be sucked through water inlet, potentially leading to engine ENOF00549-0...
  • Page 54 ENGINE OPERATION ENOF00551-1 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. ENOF00343-A ENOF00067-2...

  • Page 55: 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 ENOW00065-0 WARNING ENOW00064-0 CAUTION Close air vent screw of fuel tank before car- rying or storing outboard motor and fuel Engine may be hot immediately after operat- tank, or fuel may leak, potentially catching...

  • Page 56: 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 cock before carrying or storing outboard ENOF01416-1 motor and fuel tank, or fuel may leak, ENON00021-1 potentially catching fire.
  • Page 57 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 58: Adjustment

    ADJUSTMENT EFT type ENOM00073-0 1. Steering friction Tiller handle type ENOW00074-B WARNING Do not over tighten the steering friction adjustment bolt or lever it could result in dif- ficulty of movement resulting in the loss of control causing an accident and could lead ENOF01418-0 to severe injury.

  • Page 59: Remote Control Lever Friction

    ADJUSTMENT ENOM00075-0 ENOM00076-0 3. Remote control lever 4. Trim tab adjustment friction ENOW00076-1 EP, EPT type WARNING ENOW00074-C Be sure that outboard motor is secured to WARNING transom or service stand, or accidental drop or fall of outboard motor could lead Do not over tighten the remote control to severe personal injury.
  • Page 60 ADJUSTMENT ENOF00912-A 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 61: 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 main- tenance schedules that follow. ENOW00077-0 CAUTION Your personal safety and that of your pas- sengers depends on how well you main-...

  • Page 62: Daily Inspection

    INSPECTION AND MAINTENANCE ENOM00551-0 1. Daily Inspection Perform the following checks before ENOW00078-1 and 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 63 INSPECTION AND MAINTENANCE ENOM00081-C ENON00024-0 Oil level checking Note If the oil level is low, or too high, the life The oil level should be checked when the of the engine will be shortened signifi- engine is cooled. cantly. ENON00025-0 1.
  • Page 64 INSPECTION AND MAINTENANCE level, use fresh water to remove salt, chemicals or mud. And flush cooling water passage after every cruising or before storing outboard motor for long time. Before flushing, remove the propel- ler and the forward thrust holder. ENOM00085-A Flushing attachment ENOW00922-0...
  • Page 65 And be sure to remove the propeller, when If the fuse continues to blow, request an starting the engine in the test tank. (See authorized Tohatsu dealer to inspect the page 72) Run the engine only at idling. outboard motor.
  • Page 66 INSPECTION AND MAINTENANCE 1. Stop the engine and disconnect the battery cable from the battery nega- tive (-) terminal. 2. Remove the engine cover. 3. Remove the fuse box lid. 4. Remove the fuse and check it. If the fuse is blown, replace it with a fuse of the same specified rating.

  • Page 67: Periodic Inspection

    INSPECTION AND MAINTENANCE ENOM00555-0 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 number of months, whichever comes first.
  • Page 68 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-C 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 69 INSPECTION AND MAINTENANCE 7. Reset the engine in a vertical posi- ENON00920-0 Note tion. Use only recommended engine oil (See 8. Repeat 2 to 7 procedures two or page 13) three times to drain the oil com- pletely. 9. Remove the top cowl and the oil filler cap.
  • Page 70 INSPECTION AND MAINTENANCE ENOM00093-A ENOM00096-A Fuel filters and fuel tank cleaning Fuel filter (for fuel tank) Water or dirt in the fuel tank will cause ENOW00093-A engine performance problems. WARNING Check and clean the tank at specified Gasoline and its vapors are very flammable times or after the outboard motor has and can be explosive.
  • Page 71 INSPECTION AND MAINTENANCE drop or fall of outboard motor could lead to severe personal injury. Be sure to lock outboard motor if it is tilted up, or accidental fall of outboard motor could lead to severe personal injury. Do not go under outboard motor tilted up and locked, or accidental fall of outboard motor could lead to severe personal injury.
  • Page 72 INSPECTION AND MAINTENANCE fire prevention and environment protection the motor's performance, and cause regulations. engine trouble. 1. Put a piece of wood block between ENON00032-0 propeller blade and anti-ventilation Note plate to hold propeller. If water in the oil, giving it a milky colored appearance.
  • Page 73 INSPECTION AND MAINTENANCE 6. Tighten the propeller nut to specified 1. Stop the engine. torque, and align one of grooves to 2. Remove the top cowl. propeller shaft hole. 3. Remove the spark plug caps. Propeller nut torque: 4. Remove the spark plugs by turning it 12 N·m (9 ft ·...
  • Page 74 INSPECTION AND MAINTENANCE adjusted to the correct torque as soon as possible with a torque-wrench. ENOF01427-0...
  • Page 75 INSPECTION AND MAINTENANCE ENOM00088-A Anode replacement A sacrificial anode protects the outboard motor from electrolytic corrosion. Anode is located on the gear case, cylinder etc.. When the anode is eroded more than 1/3 of original size, replace it. ENON00029-0 Notes Never grease or paint the anode.
  • Page 76 INSPECTION AND MAINTENANCE ENOM00089-B 1. Oil cap Power Tilt oil checking 2. Oil level Recommended oil ENOW00088-0 Use an automatic transmission fluid or WARNING equivalent. Recommended oils are as shown below. Be sure that outboard motor is secured to transom or service stand, or accidental ATF Dexron III drop or fall of outboard motor could lead to severe personal injury.
  • Page 77 INSPECTION AND MAINTENANCE ENOM00960-0 Grease point Apply water proof grease to the parts shown below. ENOF01429-0...

  • Page 78: 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 and carburetor (See page 80), WARNING and clean these parts. Keep in mind that if gasoline is kept in Be sure to disconnect fuel connector the carburetor for a long time, gum except when operating engine.
  • Page 79 INSPECTION AND MAINTENANCE ENOF01415-0 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 ENOF01416-1 the fuel to deteriorate during storage.
  • Page 80 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 81: 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 throttle. The oil used for storage the electrolyte from deteriorating. inside the engine will be circulated out to assure optimum performance.

  • Page 82: 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 83 TROUBLESHOOTING ENOM00561-0 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 84 TROUBLESHOOTING Possible cause Low compression Carbon deposits in the combustion chamber Incorrect valve clearance Low oil pressure/level 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...
  • Page 85 ACCESSORIES KIT ENOM00562-1 The following 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 86 PROPELLER TABLE ENOM00111-0 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. 5000–6000 min (rpm) Propeller Size (Diameter × pitch) Propeller Mark No. of Blades Light boats 8.9 ×...
  • Page 88 O W N E R’ S M A N U A L MFS 6BZ MFS 8B MFS 9.8B 5-4, Azusawa 3-Chome, Itabashi-Ku Tokyo 174-0051, Japan Tel: +81-3-3966-3117 Fax: +81-3-3966-0090 www.tohatsu.com...

This manual is also suitable for:

Mfs 8bMfs 9.8b

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