TOHATSU BFT75A - User Manual

Questions and Answers

D
Dr. Sarah MathewsAug 2, 2025
What to do if my TOHATSU BFT75A engine does not start?
- G
  Gary MoralesAug 2, 2025
  If your TOHATSU Outboard Motor engine doesn't start, several issues could be the cause. It could be due to a clogged or damaged fuel tube, a closed fuel tank vent knob, a faulty primer bulb, a clogged fuel strainer (low pressure side), a clogged water separator, a faulty fuel pump (low pressure side), a clogged vapor separator air vent tube or filter, or a faulty vapor separator. Also, you can perform fuse/electrical power system troubleshooting, alert system/warning system troubleshooting and starting system troubleshooting.
M
Monique RivasAug 11, 2025
Why does my TOHATSU BFT75A Outboard Motor engine start but stall soon after?
- K
  Kimberly TorresAug 11, 2025
  If your TOHATSU Outboard Motor engine starts but stalls soon after, it might be due to an incorrect spark plug heat range, a loose IAC valve and/or throttle body mounting bolt, a clogged or damaged fuel tube, a clogged fuel strainer (low pressure side), or a faulty fuel pump (high pressure side). You can also perform alert system/warning system troubleshooting and adjust the idle adjusting screw.
J
Jenna KnoxAug 18, 2025
Why is the engine speed not stable during idle and trolling on my TOHATSU BFT75A?
- K
  kristin07Aug 18, 2025
  If your TOHATSU Outboard Motor engine speed is not stable during idle and trolling, possible causes include an incorrect spark plug heat range, a loose IAC valve and/or throttle body mounting bolt, a clogged or damaged fuel tube, a clogged fuel strainer (low pressure side), or a faulty fuel pump (high pressure side). Also, you can perform alert system/warning system troubleshooting.
P
parkeranthonyAug 26, 2025
What to do if the MIL and warning buzzer does not operate on my TOHATSU Outboard Motor?
- J
  jasonmillsAug 26, 2025
  If the MIL and warning buzzer of your TOHATSU Outboard Motor do not operate, the possible solutions include replacing the blown fuse and checking for a short in the main wire harness or incorrect load by referring to the "FUSE LOAD CHART". Other solutions are replacing the ECM or the PGM-FI/main relay with a new one and rechecking. Also, repair any opens in the wire harness between the ECM and engine ground, between the battery and combination switch, or between the ECM and PGM-FI/main relay. A faulty combination switch may also be the cause.

Summary

Specifications

Dimensions and Weights

Provides detailed dimensions and weights for various models including BF75DK3, BF80A, and BF90DK4.

Engine Specifications

Lists engine specifications like displacement, bore x stroke, rated power, maximum torque, and compression ratio.

Service Information

Maintenance Standards

Details the standard specifications and service limits for various engine parts like valves, pistons, and cylinder head.

Engine & Frame Torque Values

Lists torque specifications for engine and frame fasteners, including N·m, kgf·m, and lbf·ft values.

Lubrication and Seal Points

Specifies materials and locations for lubrication and seal points for the engine, gear case, and stern bracket.

Maintenance

Maintenance Schedule

Provides a regular service schedule based on time intervals or operating hours, covering various maintenance tasks.

Engine Oil Level Check and Oil Change

Details the procedure for checking and changing the engine oil, including recommended oil types and capacities.

Gear Case Oil Change

Explains the inspection and procedure for changing the gear case oil, including capacity and recommended oil.

Troubleshooting

Before Troubleshooting

General checks and precautions to take before performing troubleshooting procedures.

Engine Troubleshooting

Provides diagnostic steps for common engine issues like not starting or stalling.

Fuse and Electric Power Line Troubleshooting

Guides for troubleshooting issues related to fuses, electrical power lines, and the fuse box connection table.

Alert System and Warning System Troubleshooting

Details on how to troubleshoot issues with the alert system, warning buzzer, and indicator lights.

Fuel System

Fuel Line Service

DTC Troubleshooting

Provides a DTC index and probable causes for various DTC codes related to fuel system components.

Charging System

Charging System Troubleshooting

Guides troubleshooting steps for battery issues, fuses, load inspection, alternator, and regulator/rectifier.

Alternator Inspection

Ignition System

Ignition System Troubleshooting

Provides troubleshooting steps for issues related to the MIL, fuses, emergency stop switch, and spark plugs.

Starting System

Starting System Troubleshooting

Guides for diagnosing issues like starter motor not turning or turning slowly.

Starter Motor Removal;Installation

Other Electrical

ECM, PGM-FI;Main Relay Removal;Installation

Regulator;Rectifier, Fuse Box, 70 A Fuse Box Removal;Installation

Cooling System

Thermostat and Water Jacket Cover Removal;Installation

Water Pump Removal;Installation

Lubrication System

Starting Procedure After Installing Major Assemblies

Oil Case Removal;Installation

Engine Removal;Installation

Engine Removal

Detailed steps for removing the engine, including disconnecting various components and systems.

Engine Installation

Step-by-step instructions for installing the engine, including gasket application and bolt tightening sequences.

Cylinder Head

Cylinder Head Removal;Installation

Detailed procedure for removing and installing the cylinder head, emphasizing cold engine and surface protection.

Cylinder Block

Crankcase, Crankshaft, Cylinder Block, Piston Disassembly;Assembly

Crankshaft, Piston, Cylinder Block Inspection

Gear Case

Propeller Removal;Installation

Trim;Tilt

Power Trim;Tilt and Swivel Case Removal;Installation (Except LHGX Type)

Power Trim;Tilt Disassembly;Assembly

Detailed steps for disassembling and assembling the power trim/tilt unit, including fluid handling and notices.

Controls

Remote Control Cable and Grommet Removal;Installation

Shift Link Bracket and Neutral Switch Removal;Installation

TOHATSU BFT75A Specifications

General

Engine Type	2-Stroke
Starting	Electric
Cooling System	Water-Cooled
Fuel Type	Gasoline
Full Throttle RPM Range	5000 - 6000 RPM
Horsepower	75 hp (55.1 kw)

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