TOHATSU MFS 2.5B Owner's Manual
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TOHATSU MFS 2.5B Owner's Manual

TOHATSU MFS 2.5B 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 2.5B
MFS 3.5B
OB No.003-11109-4AH1

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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 2.5B MFS 3.5B OB No.003-11109-4AH1...
  • Page 2 MANUAL IN A SAFE LOCATION FOR FUTURE REFERENCE. Copyright © 2018 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 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 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 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 39).

  • Page 12: Specifications

    SPECIFICATIONS ENOM00810-A MODEL FEATURE Model F2.5B F3.5B Type Transom heights Tiller Handle Remote Control Separate fuel tank Integral fuel tank Manual tilt *1: Option ENOM00811-A MODEL NAME EXAMPLE F 3.5 BL Product genera- Model description Horse power Shaft length tion S= Short 15 in F= Four stroke A and up...
  • Page 13 2.15 (13 : 28) Emission Control System EM (Engine modification) Operator Sound Pressure 80.1 (ICOMIA 39/94) dB (A) Hand Vibration Level (ICOMIA 38/94) m/s Remark: Specifications subject to change without notice. Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).

  • Page 14: Parts Name

    PARTS NAME ENOM00202-0 2.5B, 3.5B ENOF00201-0 Fuel Tank Cap Drive Shaft Housing Engine Oil Drain Screw Tilt Handle Thrust Rod Engine Oil Level Gauge Top Cowl Clamp Bracket Air Vent Screw Cowl Latch Clamp Screw Fuel Cock Cooling Water Check Port Throttle Grip Steering Adjustment Screw Shift Lever...

  • Page 15: Label Locations

    LABEL LOCATIONS ENOM00203-0 Warning label locations 1, 2 ENOF01605-1 Warning label urge to read the Warning label on position of outboard owner’s manual. motor when setting down. ENOF00253-0 ENOF00120-0 Warning regarding high temperature. Warning label regarding stop switch (See page 25, 31) 3GR-76191-0 ENOF00131-B...
  • Page 16 LABEL LOCATIONS 5-1.Warning regarding emergency start- ing (See page 26). 5-2.Warning regarding rotating object. 5-3.Warning regarding high temperature. 5-4.Warning regarding high voltage 3PA-72181-100 Warning regarding fuel tank cap (See page 21, 24) ENOF02050-0...
  • Page 17 LABEL LOCATIONS ENOM00019-B CE label locations Outboard Motor Rated Power: 0123 Mass: Serial No. Made in Japan CAN ICES-2/NMB-2 ENOF01606-1 1. Model code(Model name) 2. Rated power 3. Dry mass weight( Without propeller, with battery cable) 4. Serial No. 5. Manufacturer name 6.

  • Page 18: 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 19 INSTALLATION ENON00002-0 Note A rope is not included in the standard accessories. 30−50 mm (1.2−2 in) ENOF01608-0 1. Bottom of hull 2. Anti ventilation plate ENOW00007-0 CAUTION Before beginning the running test, check ENOF01626-0 that the boat with maximum capacity 1.

  • Page 20: Pre-Operating Preparations

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

  • Page 21: Fuel Filling

    PRE-OPERATING PREPARATIONS storage if alcohol has washed protective oil Be sure to remove the static electricity films from internal components. charged in your body before refueling. The sparks due to static electricity may cause explosion of flammable gasoline. ENOW00018-0 Stop the engine, and do not start the WARNING engine during refueling.

  • Page 22: Engine Oil Recommendation

    PRE-OPERATING PREPARATIONS 1. Before opening fuel tank cap, turn air properly fill the engine with oil follow the instructions, See page 45) vent screw two times counterclock- wise to release air pressure in the fuel tank. ENOF00240-0 ENOF00209-A Use only high quality 4-stroke engine oil 1.

  • Page 23: 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 24: Engine Operation

    ENGINE OPERATION tank is raised by heat from sources such as ENOM00042-0 sun light. Before starting 1. Loosen the air vent screw on the tank ENOW00022-A cap by two turns. CAUTION 2. Open the fuel cock. The engine oil is drained for shipping from the factory.
  • Page 25 ENGINE OPERATION 2. Set the control lever in the Neutral position. ENOF00863-0 1. Test tank 2. Water 3. Over 10 cm (4 in.) ENOF00215-0 1. Shift lever 2. Neutral (N) ENOW00036-0 3. Forward (F) CAUTION 3. Set the throttle grip to START posi- Be sure to stop engine immediately if cooling tion.
  • Page 26 ENGINE OPERATION ENON00501-0 Note Choke is not necessary when the engine is warm. Set the throttle grip to “RE-START” position. ENON00502-0 Note If engine does not start with 4 or 5 times starting operation, push the knob back and restart. ENOF00223-1 5.
  • Page 27 ENGINE OPERATION 1. Remove the top cowl. 4. Remove the recoil starter. ENOF00220-0 5. Tighten the three bolts (A, B, C) fas- ENOF00217-0 tening the tank and one bolt (D) fas- tening the recoil starter. 1. Cowl latch 2. Loosen the three bolts (A, B, C) fas- tening the tank.

  • Page 28: Warming Up The Engine

    ENGINE OPERATION 8. Set the control lever in the Neutral position. 9. Pull the starter handle slowly until you feel engagement, keep pulling till you feel less resistance. Then pull it quickly. ENOF00223-0 1. Cooling water check port ENOM00044-0 Engine speeds Idling speed after warming up.
  • Page 29 ENGINE OPERATION sonal Flotation device) or arm and keep it ENOW00863-0 attached during cruising. CAUTION Do not attach the tether to a part of clothing that can be torn easily when Idle speed may be higher during warming up pulled. of engine.

  • Page 30: Stopping The Engine

    ENGINE OPERATION Forward 1. Turn the throttle grip to reduce engine speed. 2. When the engine reaches trolling (or idling) speed, quickly pull the shift lever to the Forward position. Reverse 1. Turn the throttle grip to reduce engine speed. ENOF01119-0 1.
  • Page 31 ENGINE OPERATION 3. Push the stop switch. Emergency engine stopping Remove stop switch lock to stop the engine. ENOF01611-A 1. Shift lever ENOF00226-A 2. Stop switch 3. Stop switch lock 1. Shift lever 4. Hook 2. Stop switch 3. Stop switch lock 4.

  • Page 32: Steering

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

  • Page 33: Tilt Up And Down

    ENGINE OPERATION 3. Raise the outboard motor to the tilt up position. 4. Change the thrust rod position as fol- lowing picture. ENOF00052-0 ENOM00054-0 Improper trim angle (bow dips into the water) Set the thrust rod higher if the bow of the boat is below horizontal.
  • Page 34 ENGINE OPERATION ENOW00056-A WARNING When tilting up outboard motor with fuel joint for over a few minutes, be sure to dis- connect fuel hose, or fuel may leak, poten- tially catching fire. ENOW00057-0 CAUTION Do not tilt up outboard motor while engine operates, or no cooling water may be fed, leading to engine seizure due to overheating.

  • Page 35: Removing And Carrying The Outboard Motor

    REMOVING AND CARRYING THE OUTBOARD MOTOR ENOM00070-B 1. Removing the outboard motor ENOW00064-0 CAUTION Engine may be hot immediately after operat- ing and could cause burns if touched. Allow engine to cool down before attempting to carry the outboard. ENOF01607-0 ENOM00071-A 2.

  • Page 36: Trailering

    REMOVING AND CARRYING THE OUTBOARD MOTOR Keep the outboard motor in a vertical ENOM00072-A 3. Trailering position when carrying. The optional outboard motor stand is recommended for keeping the outboard ENOW00072-0 motor vertical both during transport and CAUTION storage. Trailering in the tilted position may cause damage to the outboard motor, boat, etc.
  • Page 37 REMOVING AND CARRYING THE OUTBOARD MOTOR When transporting a boat on a trailer with the outboard motor still attached, disconnect the fuel line from the out- board motor beforehand and keep the outboard motor in the normal running position or on a transom saver bar. Tiller handle type To prevent the outboard motor from moving when it is attached on a boat...

  • Page 38: Adjustment

    ADJUSTMENT ment resulting in the loss of control causing ENOM00073-0 an accident and could lead to severe injury. 1. Steering friction Friction adjustment of the throttle grip Tiller handle type can be made with the throttle adjustment ENOW00074-A screw. WARNING Do not overtighten the steering friction lever it could result in difficulty of movement resulting in the loss of control causing an...

  • Page 39: Inspection And Maintenance

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

  • Page 40: Daily Inspection

    INSPECTION AND MAINTENANCE ENOM00228-0 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 41 INSPECTION AND MAINTENANCE When replenishing engine oil, be careful ENOM00229-A Oil level checking not to allow entry of foreign matters such 1. Stop the engine and set it in a vertical as dust and water into oil chamber. Wipe off engine oil well immediately if position.
  • Page 42 INSPECTION AND MAINTENANCE 5. Tilt up the outboard motor. ENOW00920-0 CAUTION When washing the outboard motor, be care- ful not to spray the water inside of the top cowl, especially electrical components. ENON00026-0 Note It is recommended to check chemical properties of water on which your out- board motor is regularly used.
  • Page 43 INSPECTION AND MAINTENANCE And be sure to remove the propeller, when starting the engine in the test tank. (See page 48) Run the engine only at idling. ENOF00863-0 1. Test tank 2. Water 3. Over 10 cm (4 in.)

  • Page 44: Periodic Inspection

    INSPECTION AND MAINTENANCE ENOM00235-0 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, which- ever comes first.
  • Page 45 INSPECTION AND MAINTENANCE Inspection intervals First 20 Every 50 Every 100 Every 200 Description Inspection procedure Remarks hours of 1 hours of 3 hours of 6 hours of 1 month months months year Sliding and Rotating Parts Apply and pump in grease. Grease Nipples Outer Equipment Check for corrosion.
  • Page 46 INSPECTION AND MAINTENANCE ENOF00244-0 1. Oil filler cap 2. Engine oil drain screw 3. Engine oil level gauge ENOF01616-0 1. Drain hole 4. Tighten the oil drain screw with apply- ing oil on the sealing surface of screw. (Use new oil drain washer) Oil drain screw specified torque 18N·m (13 ft·lb, 1.8 kgf·m) ENON00028-A...
  • Page 47 INSPECTION AND MAINTENANCE ENOW00925-0 CAUTION Wipe off engine oil well immediately if spilled and dispose of it in accordance with local fire prevention and environment protection regulations. ENON00031-0 Note If any amount of water is found in engine oil, making it milky white, consult ENOF01617-0 dealer.
  • Page 48 INSPECTION AND MAINTENANCE attached, shift in forward or reverse, ENOW00095-0 main switch at other than “OFF”, engine CAUTION stop switch lock attached to the switch, and starter key attached, or engine could Do not reuse oil plug gasket. Always use new accidentally start leading to serious per- gasket and tighten oil plug properly to pre- sonal injury.
  • Page 49 INSPECTION AND MAINTENANCE 3. Apply water proof grease to the pro- 6. Measure the spark plug electrode gap peller shaft before installing a new with a wire type feeler gauge. The gap propeller. should be 0.8-0.9 mm (0.031-0.035 inches). If the gap is different, replace 4.
  • Page 50 INSPECTION AND MAINTENANCE ENOM00088-B 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 51 INSPECTION AND MAINTENANCE ENOM00960-0 Grease point Apply water proof grease to the parts shown below. ENOF01622-0...

  • Page 52: Off-Season Storage

    INSPECTION AND MAINTENANCE 4. Remove the spark plugs and put a ENOM00100-A 3. Off-season storage teaspoon of engine oil or spray stor- age oil into the combustion chamber ENOW00934-0 through the spark plug holes. WARNING 5. Turn the starter motor several turns to lubricate inside the cylinder.
  • Page 53 INSPECTION AND MAINTENANCE 3. After adding the additive, let the out- board motor run in the water for 10 minutes to make sure any old fuel in the fuel system has been completely replaced by the fuel with additive. 4. Turn the engine OFF ENON00891-0 Note ENOF01613 0...

  • Page 54: Pre-Season Check

    INSPECTION AND MAINTENANCE 1. Turn off the fuel cock. ENOM00104-B 4. Pre-season check The following steps must be taken when first using the engine after off-season storage. 1. Check that the shift and throttle function properly. (Be sure to turn the propeller shaft when checking the shift function or else the shift linkage ENOF01625-0...

  • Page 55: Cold Weather Precautions

    INSPECTION AND MAINTENANCE The following are the emergency mea- ENOM00107-A 7. Striking underwater object sures to be taken for a submerged out- board motor, if you can not take it your dealer right away. ENOW00935-0 1. Wash the outboard motor with fresh CAUTION water to remove salt or dirt.

  • Page 56: Troubleshooting

    TROUBLESHOOTING ENOM00241-0 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 Deformed or damaged fuel hose Closed air vent on fuel tank Clogged fuel filter, fuel pump, or carburetor...
  • Page 57 TROUBLESHOOTING Possible cause Incorrect adjustment of throttle link Insufficient cooling water flow, clogged or defective pump Faulty thermostat Cavitation or ventilation Incorrect propeller selection Damaged and bent propeller Improper thrust rod position Unbalanced load on boat Transom too high or too low Low compression Carbon deposits in the combustion chamber Engine makes noise...

  • Page 58: Accessories Kit

    ACCESSORIES KIT ENOM00242-0 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 Socket wrench handle Screwdrivers Cross-and straight-point Screwdriver handle Emergency starter rope ø4–1000 mm...

  • Page 59: Propeller Table

    PROPELLER TABLE ENOM00245-0 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. 2.5: 4500–5500 min (rpm) 3.5: 5000–6000 min (rpm) ENON00245-0 Note Each size shows number of propeller blades diameters pitch.
  • Page 60 O W N E R’ S M A N U A L MFS 2.5B MFS 3.5B 5-4, Azusawa 3-Chome, Itabashi-Ku Tokyo 174-0051, Japan Tel: +81-3-3966-3117 Fax: +81-3-3966-0090 www.tohatsu.com...

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Mfs 3.5b

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