TOHATSU MFS 75A Owner's Manual
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TOHATSU MFS 75A Owner's Manual

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O W N E R' S
M A N U A L
AAAA
Original instructions
MFS 75A
MFS 90A
MFS 100A
MFS 115A
MFS 140A
OB No.003-11159-5BC2
EN

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Summary of Contents for TOHATSU MFS 75A

  • Page 1 O W N E R’ S M A N U A L AAAA Original instructions MFS 75A MFS 90A MFS 100A MFS 115A MFS 140A OB No.003-11159-5BC2...
  • Page 2 MANUAL IN A SAFE LOCATION FOR FUTURE REFERENCE. Copyright © 2023 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 TO THE EXTENT PERMITTED BY APPLICABLE LAW, YOUR OUTBOARD MOTOR WILL NOT BE COVERED BY THE APPLICABLE LIMITED WARRANTY, IF THIS PROCEDURE IS NOT FOLLOWED. ENOM00003-1 PRE-DELIVERY INSPECTION Make sure Pre-delivery inspection has been properly done by authorized TOHATSU dealer before operating your outboard motor.
  • Page 5 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. The serial number is required for warranty registration, filing a warranty claim as well as making technical inquiries and may be required for other occasions.Therefore, please write down the serial number and date of purchase in the space below.
  • Page 6 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

    3. Propeller installation ......... . 24 4. TOCS (Tohatsu Onboard Communication System) installation..25 6.
  • Page 8 7. Striking underwater object ........88 8.
  • 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 F75A F90A F100A F115A F140A Type Transom heights Multi-function tiller handle Remote Control Power Trim & Tilt These models can be purchased with remote rigging kit or multi-function tiller han- dle. ENOM00811-A MODEL NAME EXAMPLE F 140A ETL Model descrip- Product genera-...
  • Page 13 (ICOMIA 39/94 Rev.1) dB (A) Hand Vibration Level (ICOMIA 38/94 Rev.1) m/s Remark: Specifications subject to change without notice. *1: With properller *2: Transom angle is at -12° Tohatsu outbard is power rated in accordance with ISO8665 (propeller shaft output).
  • Page 14 SPECIFICATIONS Service data MFS 140A Model MFS 75/90/100/115A Item Fuel Unleaded Regular Gasoline : R+M/2: 87 or higher RON: 91 or higher Grade API: SH, SJ, SL SAE: 10W-30, 10W-40 Engine Oil 4.0 (4.2/3.5) without oil filter replacement (US/Imp.qt) 4.2 (4.4/3.7) with oil filter replacement Grade API:GL-5, SAE:80-90 Gear Oil...

  • Page 15: Parts Name

    PARTS NAME ENOM00820-0 ET (with multi-function tiller handle) ENOF02402-0 Air Guide Anode Spark Plug Top Cowl Thrust Rod Oil Level Gauge Bottom Cowl Clamp Bracket Cowl Hook Lever Cooling Water Check Port Steering Friction Lever Idle Port Drive Shaft Housing Main Switch Key Manual Valve Anode...
  • Page 16 PARTS NAME ENOM00822-0 Remote control box & Fuel tank ENOF02403-0 Control Lever PTT switch Primer bulb Neutral lock arm Neutral throttle button Fuel connector (Fuel tank PTT switch Main switch side) Free throttle lever Stop switch Main switch Stop switch lock Stop switch Stop switch lanyard Stop switch lock...

  • Page 17: Label Locations

    LABEL LOCATIONS ENOM00019-A Warning label locations ENOF02404-0...
  • Page 18 LABEL LOCATIONS Read owner's manual. For tiller handle model 4. Stop switch (See page 39 page 50) ENOF00120-0 2-1. Warning regarding starting engine (See page 38). 3GF-72200-1 For RC model 2-2. HOT SURFACE Warning regarding stop switch lan- Can cause burns. yard.
  • Page 19 LABEL LOCATIONS Warning regarding gasoline (See page 26). ENOF00005-M Warning regarding gasoline (See page 26). ENOF00005-F Caution tag regarding for replenish the engine oil. (See page 28). 3VJ-72044-000...
  • Page 20 LABEL LOCATIONS ENOM00019-B CE label locations 0026 1521 CAN ICES-2 / NMB-2 ENOF02405-2 1. Model code (Model name) 2. Serial No. 3. Rated power 4. Dry mass weight (Without propeller, with battery cable) 5. Manufacturer name 6. Manufacturer address 7. Authorised representative 8.

  • Page 21: Installation

    INSTALLATION ENOM01800-0 1. Mounting the outboard motor on boat ENOW00961-0 WARNING Do not over-power the boat and take care not to over-load the engine. Boat manufac- turers specify the maximum allowable engine power and complement of their boat in ENOF02406-0 accordance with certain standards and show the data on the plate attached to the boat.

  • Page 22: Battery Installation

    INSTALLATION that there is enough distance between ENON00946-0 Note bottom cowl and water surface to prevent water from entering the engine. Do not reuse nylon locking nut. Make sure to mount the engine in correct position. If outboard motor is mounted ENOM001816-0 incorrectly, water may intrude the engine 2.
  • Page 23 INSTALLATION ENOW00014-0 1. Place the battery box in a convenient position and away from possible water CAUTION spray. Securely fasten both the box Make sure that the battery leads do not and the battery so they do not shake get stuck between the outboard motor loose.

  • Page 24: Propeller Installation

    INSTALLATION ENOM00123-0 After installing split pin, spread the pin apart to prevent it from falling out which 3. Propeller installation could lead to the propeller coming off during operation. ENOW00084-0 WARNING Propeller must be selected that will allow the engine to reach recommended maxi- Do not begin propeller removal and instal- mum operating range during cruising.

  • Page 25: Tocs (Tohatsu Onboard Communication System) Installation

    Propeller nut torque: 35 N·m (25 ft·lb, 3.5kgf·m) 5. Install a new split pin into the nut hole and bend it. ENOM01821-1 4. TOCS (Tohatsu Onboard Communication System) installation TOCS (Tohatsu Onboard Communication System) interface coupler can provide information regarding engine speed, fuel consumption, and various possible mal- functions.

  • 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 ENOW00018-1 Stop the engine, and do not start the engine during refueling. WARNING Do not smoke. Be careful not to overfill fuel tank. Wipe Fuel leakage can cause fire or explosion, up any spilled gasoline immediately. potentially leading to severe injury or loss of life.

  • 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 dip stick, drain oil to level lower than upper limit.
  • Page 29 PRE-OPERATING PREPARATIONS 3. Remove the oil filler cap. 4. Fill the engine through the filler port with the oil to between the upper and lower limit mark on the dipstick. 5. Tighten the oil filler cap. ENOF02439-0 ENOF02440-0 1. Cowl hook lever ENOF02407-0 Engine oil recommendation 1.

  • 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 37) to learn how to cor-...

  • Page 31: Warning System

    PRE-OPERATING PREPARATIONS ENOM00039-0 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 ENOF00852-2 not be stopped).
  • Page 32 PRE-OPERATING PREPARATIONS ENOM01822-0 Warning indicators, faults and remedy For one warning lamp Warning indicators Description of faults Rem- or notice Sound A lamp Normal system test Continuous when key on Engine speed exceeds High speed ESG maximum Continuous allowable RPM Low speed ESG (*2) Low oil pressure (*1) Continuous (*2)
  • Page 33 PRE-OPERATING PREPARATIONS ENOM00126-A Remedy Reduce the speed to less than half open throttle, and move to safe place quickly, and stop the engine. Check the propeller for bent or dam- age on blades. Consult an authorized dealer if engine shows the same result even after replacing propeller with a new one.
  • Page 34 PRE-OPERATING PREPARATIONS ENOM00041-A Warning indicators, faults and remedy For three warning lamps Warning indicators Description of faults Rem- or notice Sound A lamp B lamp C lamp Normal system test Continuous when key on Engine speed exceeds High speed maximum Continuous allowable RPM Low speed...
  • Page 35 PRE-OPERATING PREPARATIONS ENOM00126-A1 ENOM00870-0 Remedy Engine oil replacement indicator function reset method Reduce the speed to less than half As for "Engine oil replacement indicator open throttle, and move to safe place function", informing the appropriate quickly, and stop the engine. timing of engine oil replacement by Check the propeller for bent or dam- blinking of the lamp, when beyond 100...
  • Page 36 PRE-OPERATING PREPARATIONS 4. Within 5-10 seconds you will here 3 beeps to inform you that you have successfully reset the system. ENOF00856-0 5. Turn the ley to the 'off' position and replace the safety lanyard lock. The engine oil replacement indicators function operates again after 100 hours operation from reset this function.

  • Page 37: Engine Operation

    ENGINE OPERATION ENOM00042-0 ENOM01804-0 Before starting 1. Fuel feeding ENOM00246-0 ENOW00029-A Oil Level checking WARNING Check the engine oil level before each use. If the oil level is low or too high, the When opening fuel tank cap, be sure to fol- low the procedure described below.
  • Page 38 ENGINE OPERATION ENOM01805-0 2. Starting the engine ENOW00958-1 WARNING Do not remove or install the top cowl ENOF02442-0 after the engine has started. 1. Joint 2. Cap The exposed rotating engine parts cause serious injury. 4. Connect the primer bulb to the fuel tank.
  • Page 39 ENGINE OPERATION ENOW00036-1 CAUTION Operating outboard motor without cooling water will lead to overheating and damage on the outboard motor severely. In case the cooling water check port is not discharging water, stop the outboard motor immedi- ately, check for any object, debris which may be blocking the cooling water check port.
  • Page 40 ENGINE OPERATION 4. Set the throttle grip to START posi- tion. ENOF00866-2 ENOF00867-3A 1. Throttle grip 1. Main switch key 2. Warning lamp 5. Turn the main switch key to ON posi- tion and confirm three warning lamps 7. Make sure that water is being dis- light up with beep sound and then charged from the cooling water check lights out.
  • Page 41 ENGINE OPERATION ENOF00851-A 1. Warning lamp 5. Turn the main switch key to the START ENOF00869-1 position and release it to start the 1. Stop switch lock engine. The engine will crank continu- 2. Insert the main switch key. ously until the engine starts. 3.
  • Page 42 ENGINE OPERATION 2. Insert the main switch key. 3. Set the control lever in the Neutral position. Do not use the Neutral throttle button to open the throttle when starting the engine. ENOF02408-0 ENOM00974-B Top mount RC 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...

  • Page 43: Starting The Engine

    ENGINE OPERATION ENON00942-0 6. Check the cooling water from cooling Note water check port. It takes maximum 4 seconds of the continuous crank before the engine starts. If fail to start the engine, crank again after 10 seconds or more. ENOF02408-0 ENOM00043-A 3.
  • Page 44 ENGINE OPERATION ENOM00972-0 neutral, push and hold the neutral throt- Free throttle lever (Side mount RC tle button. While holding the button, type) move the lever forward to throttle up the ENOW00956-0 engine. CAUTION When the control lever is returned to the neutral position, the button will reset Keep the free throttle lever fully closed- automatically.

  • Page 45: Forward, Reverse, And Acceleration

    ENGINE OPERATION Buzzer makes one short sound when the Be careful not to pull the lanyard acciden- tally during cruising. Unintentional stop of engine speed is set to 650 min (rpm), engine can cause loss of control of out- indicating the minimum trolling speed is board motor.
  • Page 46 ENGINE OPERATION ENOW00863-0 CAUTION Idle speed may be higher during warming up of engine. If shifted to Forward or Reverse during warming up, it may be difficult to shift back to neutral. In such case, stop engine, shift to neutral, and restart engine to warm ENON00014-0 Note ENOF00865-2...
  • Page 47 ENGINE OPERATION ENOM00900-0 Side mount RC type ENOF00879-2 1. Control lever ENOM00975-A Top mount RC type ENOF00877-1 1. Forward (F) 2. Neutral (N) 3. Reverse (R) 4. Fully opened (Forward) 5. Fully opened (Reverse) 6. Free throttle lever 7. Control lever 8.

  • Page 48: Stopping The Engine

    ENGINE OPERATION Reverse 2. Put the shift lever in the Neutral posi- 1. Quickly pull the control lever to the tion. Reverse (R) position at 35°, where the Run the engine for 2-3 minutes at gear is connected, while lifting up on idling speed for cooling down if it has the neutral lock arm located under been running at full speed.
  • Page 49 ENGINE OPERATION 2. Turn the main switch key to the OFF 2. Turn the main switch key to the OFF position. position. ENOF00871-1 1. ON ENOF00938-A1 2. START 3. OFF ENOW00869-1 WARNING After stopping the engine: Close the air vent screw on the fuel tank cap.
  • Page 50 ENGINE OPERATION ENOF02412-0 1. Stop switch 2. Stop switch lock ENOM00910-1 Spare emergency stop switch lock (For CE marking model) ENOF00883-2 A spare emergency stop switch lock is 1. Stop switch provided in the accessories bag. 2. Stop switch lock Make sure that spare stop switch lock is available before operating outboard motor.

  • Page 51: Steering

    ENGINE OPERATION ENOM00920-0 ENOM01815-0 6. Steering 7. Trim angle ENOW00870-1 ENOW00043-1 WARNING WARNING Sudden steering may cause passenger(s) to Adjust the trim angle when the engine is be thrown overboard or fall. stopped. Do not put hand or finger in between out- Tiller handle type board motor body and clamp bracket when adjusting trim angle to prevent pos-...
  • Page 52 ENGINE OPERATION It is imperative that the trim angle is adjusted correctly. Incorrect adjustment will cause the boat to sway, deteriorate engine performance and may cause unsafe steering conditions. ENOW00970-0 CAUTION ENOF00051-1 The power trim & tilt can be set to any trim 1.
  • Page 53 ENGINE OPERATION ENOM01820-0 Trust rod adjustment The trim angle at full tilt down is adjust- able by selected the thrust rod position. ENOF00941-0 ENOM01818-0 Improper trim angle (bow dips into the water) When the trim angle is too small, the bow will dip into the water, the speed will decrease, and water may enter the boat.

  • Page 54: Tilt Up And Down

    ENGINE OPERATION ENOM00060-A ENOM01810-0 Power Trim & Tilt type 8. Tilt up and down Tilt up 1. Press the power trim and tilt switch ENOW00055-1 "UP" until the motor has been tilted WARNING up completely. Do not tilt the outboard motor up or down when swimmer(s) and/or passenger(s) are near to prevent them from being caught between outboard motor body and clamp...
  • Page 55 ENGINE OPERATION ENOM00940-1 Manual relief valve If the battery is dead, and/or the power tilt switch is inoperative open the manual valve completely in the Manual direction. This allows the outboard motor to be tilted manually. ENOW00872-1 WARNING ENOF02416-0 Make sure the manual relief valve is closed before operating the outboard motor.

  • Page 56: Shallow Water Operation

    ENGINE OPERATION ENOM00068-A ENOM00069-A Power Trim & Tilt type 9. Shallow water operation 1. Operate the Power Trim & Tilt switch and tilt the outboard motor up into ENOW00051-0 desired shallow water running posi- WARNING tion. During shallow water operation, be careful not to place your hand between the swivel bracket and the clamp bracket.

  • Page 57: Removing And Carrying The Outboard Motor

    REMOVING AND CARRYING THE OUTBOARD MOTOR ENOM00070-A 1. Removing the outboard motor ENOW00006-1B WARNING To avoid personal injury or damage of equip- ment , make sure the allowable lifting capac- ity of the hoist is at least twice the weight of the outboard motor.

  • Page 58: Trailering

    REMOVING AND CARRYING THE OUTBOARD MOTOR Keep the outboard motor in a vertical position when carrying. The optional outboard motor stand is recommended for keeping the outboard motor vertical both during transport and ENOF00075-1 storage. 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- tially catching fire.
  • Page 59 REMOVING AND CARRYING THE OUTBOARD MOTOR ENOF00074-A 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 60: Adjustment

    ADJUSTMENT ENOM00073-0 Friction adjustment of the throttle grip 1. Steering friction can be made with the throttle adjustment screw. Tiller handle type ENOW00074-1 WARNING Do not over tighten the steering friction lever, it could result in difficult handling of the outboard motor, resulting in the loss of control causing an accident and could lead ENOF00911-1 to severe injury.

  • Page 61: Trim Tab Adjustment

    ADJUSTMENT Side mount type of outboard motor could lead to severe personal injury. ENOW00075-1 WARNING Inappropriate adjustment of trim tab could cause steering difficulty. After installing or readjusting trim tab, check if steering load is even. ENOF00078-2 If straig ht - line cr uising cannot be 1.

  • Page 62: Multi-Function Tiller Handle Angle Adjustment

    ADJUSTMENT NOM01903-0 Angle of Multi-Function Tiller Handle 5. Multi-function tiller handle according to the number of spacers. angle adjustment Spacer [1] Spacer [2] Angle (approx) (Qty) (Qty) ENOW00985-0 WARNING Do not install or remove spacers on the bracket with engine running. Do not install more than 6 spacers [ 1 ].

  • Page 63: 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 64: Daily Inspection

    INSPECTION AND MAINTENANCE ENOM00079-0 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 65 INSPECTION AND MAINTENANCE Item Points to Check Remedy • Make sure that steering handle and remote control is Repair if necessary functioning normally. Other parts • Check the anode for corrosion and deformation. Replace ENOM01823-0 Oil level checking If the oil level is low, or too high, the life of the engine will be shortened signifi- cantly.
  • Page 66 INSPECTION AND MAINTENANCE Wipe off engine oil well immediately if chemicals or mud. And flush cooling spilled and dispose of it in accordance water passage after every cruising or with local fire prevention and environ- before storing outboard motor for long ment protection regulations.
  • Page 67 INSPECTION AND MAINTENANCE ENOF02425-0 ENOF00863-0 1. Test tank 1. Hose joint 2. Water 3. Over 10 cm (4 in.) ENOM00085-A Flushing by test tank ENOM01903-A ENOW00081-1 Gear case flushing device WARNING ENOW00082-0 WARNING Do not start engine without removing pro- peller, turning propeller out in the open may Never start or operate the engine indoors or lead to personal injury.
  • Page 68 If you are unable to respond 5. Place the shift lever in the neutral to the cause or the fuse continues to blow, request an authorized Tohatsu position and start the engine and run dealer for inspection. at idle speed for 3-5 minutes.
  • Page 69 INSPECTION AND MAINTENANCE 5. Remove the fuse and check it. If the fuse is blown, replace to the supplied spare fuses in the spare fuse holder. ENOF02426-0 1. Grommet 2. 20A 3. 20A 4. 30A 5. Blown fuse ENOF02450-0 6. 50A...

  • Page 70: Periodic Inspection

    INSPECTION AND MAINTENANCE ENOM01106-1 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 71 Frequent sudden acceleration and sudden deceleration Frequent stop 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 72 INSPECTION AND MAINTENANCE ENOM00091-A 1. Stop the engine and leave it in a verti- Engine oil replacement cal position over 5 minutes. ENOW00091-1 2. Repeat full tilt up and tilt down a few CAUTION times. 3. Place the outboard motor in a vertical You may be injured due to high engine tem- position.
  • Page 73 INSPECTION AND MAINTENANCE 8. Fill the engine through the filler port ENON00920-0 Note with the recommended trapped oil to Use only recommended engine oil (See between the upper and lower limit page 29) mark on the dipstick. 9. Tighten the oil filler cap. Oil volume needed for complete oil replacement 10.
  • Page 74 INSPECTION AND MAINTENANCE ENOM00092-A Oil filter replacement ENOW00091-1 CAUTION You may be injured due to high engine tem- peratures if you fill engine oil just after oper- ENOF00094-0 ation. Engine oil should be changed after the engine has been cooled. 1.
  • Page 75 INSPECTION AND MAINTENANCE Contact authorized dealer for fuel system ENOM00096-A Fuel filter (for fuel tank) services. Services by unqualified person Water or dirt in the fuel tank will cause could lead to engine damage. engine performance problems. Fuel filters are provided inside the fuel Check and clean the tank at specified tank and engine.
  • Page 76 INSPECTION AND MAINTENANCE Be sure to lock the outboard motor in the tilt up position, or accidental fall of out- board motor could lead to severe per- sonal injury. Do not go under outboard motor in the tilt up position and locked, or accidental fall of outboard motor could lead to severe personal injury.
  • Page 77 INSPECTION AND MAINTENANCE ENOW00928-1 1. Put a piece of wood block between propeller blade and anti-ventilation CAUTION plate to hold propeller. 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.
  • Page 78 INSPECTION AND MAINTENANCE 6. Tighten the propeller nut to specified If the spark plug(s) is fouled, has carbon torque and align one of the grooves buil d up , or is w orn , it sh o ul d b e with propeller shaft hole.
  • Page 79 INSPECTION AND MAINTENANCE 8. Tighten the spark plug to the speci- fied torque. ENON00028-2A Note Spark plug tightening torque: 18 N·m (13 ft·lb) [1.8 kgf·m] If a torque-wrench is not available when you are installing a new spark plug, tighten it 1/4 to 1/2 a turn past finger-tight.
  • Page 80 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 81 INSPECTION AND MAINTENANCE ENOF02434-0...
  • Page 82 INSPECTION AND MAINTENANCE ENOM01827-0 ENOM01824-0 Ground wire checking Power Trim & Tilt fluid checking The ground wires described below are ENOW00088-0 making electrically connect between WARNING moving parts and sacrificial anodes to Be sure that outboard motor is secured to prevent galvanic corrosion.
  • Page 83 INSPECTION AND MAINTENANCE Recommended fluid Use automatic transmission fluid or equiva- lent. Recommended power trim & tilt fluid: ATF Dexron III Air purging from the Power Trim and Tilt unit. Trapped air in the Power Trim & Tilt unit will cause poor tilting movement and noise.
  • Page 84 INSPECTION AND MAINTENANCE ENOM00960-0 Grease point Apply waterproof grease to the parts shown below. ENOF02431-1...

  • Page 85: Off-Season Storage

    INSPECTION AND MAINTENANCE ENOM00100-A 2. Use a dry cloth to completely wipe off 3. Off-season storage water and salt from the electrical components. ENOW00934-0 3. Drain all fuel from the fuel hoses, fuel WARNING pump, fuel filter (See page 75) and vapor separator (See page 86), and Be sure to disconnect fuel connector clean these parts.
  • Page 86 INSPECTION AND MAINTENANCE 4. Turn the engine OFF ENON00945-0 Note Over time, oxidation of gasoline can form buildup of harmful solids called gums. Water and impurities in the fuel system can cause corrosion. To stabilize the fuel and prevent oxidation, gum buildup, and corrosion throughout the boating season, recommended to add a good fuel stabilizer to the fuel tank after each fill up.

  • Page 87: Pre-Season Check

    INSPECTION AND MAINTENANCE 5. Remove the hose clip and the drain 4. Charge the battery completely before plug by plier to drain the fuel from the storing it for the winter. vapor separator. 5. Recharge the battery once a month 6.

  • Page 88: Submerged Outboard Motor

    INSPECTION AND MAINTENANCE 8. Run the engine for 10 minutes at half 2. Check the control system, gear case, throttle. The oil used for storage boat transom etc. inside the engine will be circulated 3. Return to the nearest harbor slowly out to assure optimum performance.

  • Page 89: Troubleshooting

    TROUBLESHOOTING ENOM00109-0 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 90 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 put. Battery charging is defective, or rectifier malfunctions. Battery is dead, connection is loose or corroded.
  • Page 91 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. Combustion chamber carbon deposition is too much Spark plug is loose.

  • Page 92: Accessories Kit

    ACCESSORIES KIT ENOM00109-1 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 93: Propeller Table

    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. 5150–5850 min (rpm) Propeller Size (Number of Blades x Diameter x Pitch) Propeller Mark Light boats...
  • Page 94 INSPECTION & MAINTENANCE LOG Date Engine Hour Inspection/Maintenance Performed Performed by...
  • Page 98 O W N E R’ S M A N U A L MFS 75A MFS 90A MFS 100A MFS 115A MFS 140A 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 90aMfs 100aMfs 115aMfs 140a

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