TOHATSU MFS 6B User Manual (English)

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Questions and Answers:

Marissa JamesJul 30, 2025

Why won't my TOHATSU Outboard Motor engine start?

S
sarah99Jul 30, 2025
If your TOHATSU Outboard Motor engine fails to start, it could be due to: * An empty fuel tank. * Incorrect connection of the fuel system. * Air entering the fuel line. * A deformed or damaged fuel hose. * A closed air vent on the fuel tank. * A clogged fuel filter, fuel pump, or carburetor. * Use of improper engine oil or gasoline. * An excessive supply of fuel. * Poor carburetor adjustment. It is recommended to consult an authorized dealer for assistance.

melissacrawfordAug 13, 2025

Why does my TOHATSU MFS 6B engine start but stop soon?

J
Jose BatesAug 13, 2025
If your TOHATSU Outboard Motor engine starts but stops soon after, it could be due to several reasons: * Using a spark plug other than the one specified. * Dirt or soot on the spark plug. * No spark or a weak spark. * A short circuit in the engine stop switch. * Incorrect ignition timing. * The lock plate not being fitted. * Disconnection of a wire or a loose ground connection. For these issues, it's recommended to consult an authorized dealer for assistance.

Engine Type	2-Cylinder, 4-Stroke
Horsepower	6 HP
Starting	Manual
Fuel Tank Capacity	12 L
Full Throttle RPM Range	5000 - 6000 RPM
Gear Ratio	2.08:1
Displacement	123 cc
Fuel Type	Unleaded Gasoline (87 Octane)
Gear Shift	F-N-R
Shaft Length	15 in (S), 20 in (L)

Engine Type

2-Cylinder, 4-Stroke

Horsepower

6 HP

Starting

Manual

Fuel Tank Capacity

12 L

Full Throttle RPM Range

5000 - 6000 RPM

Gear Ratio

2.08:1

Displacement

123 cc

Fuel Type

Unleaded Gasoline (87 Octane)

Gear Shift

F-N-R

Shaft Length

15 in (S), 20 in (L)

Summary

General Safety Information

Emergency Stop Switch

Information on the emergency stop switch and its tether for safety.

Safe Operation of Boat

Responsibilities of operator for safe boat and outboard motor operation.

Servicing, Replacement Parts & Lubricants

Recommendation for authorized service and genuine parts/lubricants.

Maintenance Responsibilities

Owner's responsibility for maintenance and dealer checks.

Mounting Procedures

Requirement for trained service personnel for mounting.

Pre-Operating Preparations

Gasoline and Engine Oil

Guidelines for selecting appropriate gasoline and engine oil types.

Break-in Procedure

Procedure for breaking in the new outboard motor for optimal performance.

Engine Oil Warning Lamp

Explanation of the engine oil warning lamp and its function.

ESG (Over-Revolution Prevention)

Description of the ESG device and its activation causes.

Engine Operation

Starting the Engine

Step-by-step instructions for starting the outboard motor.

Warming Up the Engine

Procedure for warming up the engine to ensure proper lubrication.

Propeller Selection

Guidance on selecting the correct propeller for optimal engine performance.

Shifting Forward and Reverse

Instructions for shifting between forward and reverse gears safely.

Stopping the Engine

Steps and safety precautions for stopping the outboard motor.

Adjusting Trim Angle

How to adjust the trim angle for optimal boat operation and stability.

Tilt Up, Down and Shallow Water Operation

Procedures for tilting the outboard motor and operating in shallow water.

Adjustment

Steering Friction Adjustment

How to adjust the steering friction for comfortable operation.

Throttle Grip Adjustment

How to adjust the turning force of the throttle grip.

Reverse Lock

Explanation and adjustment of the reverse lock mechanism.

Inspection and Maintenance

Daily Inspection

Pre-operation and post-operation checks for the outboard motor.

Engine Oil Maintenance

Procedures for checking and replenishing engine oil levels.

Washing and Flushing

How to wash the motor exterior and flush cooling passages.

Replacing the Propeller

Steps for removing and installing a new propeller.

Replacing Spark Plugs

Procedure for replacing spark plugs, including torque specifications.

Replacing the Anode

How to replace the sacrificial anode to prevent galvanic corrosion.

Periodic Inspection Schedule

Schedule and procedures for regular periodic maintenance checks.

Changing Engine Oil

Detailed steps for changing the engine oil.

Cleaning Fuel Filters and Tank

How to clean fuel filters and the fuel tank.

Replacing Gear Oil

Procedure for draining and refilling gear oil.

Off-Season Storage Preparation

Steps for preparing the outboard motor for long-term storage.

Pre-Season Check

Checks to perform before using the engine after winter storage.

Motor Submerged in Water

Emergency measures for a submerged outboard motor.

Cold Weather Precautions

Measures to take when operating in cold weather to prevent freezing.

Checking After Striking Underwater Object

Inspection procedures after impacting an underwater object.

Troubleshooting

Fuel System Troubleshooting

Common fuel system problems and their possible causes.

Electrical System Troubleshooting

Common electrical system problems and their possible causes.

Compression, Oil & Other Troubleshooting

Problems related to compression, oil systems and other issues.

TOHATSU MFS 6B User Manual

Table of Contents