TOHATSU MFS 8A3 User Manual (English)

Other manuals for TOHATSU MFS 8A3

Questions and Answers:

M
Mrs. Sue McdowellAug 7, 2025
Why my TOHATSU MFS 8A3 engine falling to start?
- B
  Brian PhillipsAug 8, 2025
  If your TOHATSU Outboard Motor engine isn't starting, there could be several reasons: * The fuel tank might be empty, in which case, you should fill it. * There might be an incorrect connection of the fuel system, so check and correct the fuel system connections. * Air could be entering the fuel line; inspect and seal any leaks. * A deformed or damaged fuel hose may be the culprit, replace it if needed. * The air vent on the fuel tank might be closed; open it. * Finally, the fuel filter, fuel pump, or carburetor could be clogged; clean or replace these components.
B
brittany92Aug 14, 2025
Why is my TOHATSU Engine failing to start?
- R
  Ryan WatersAug 14, 2025
  There are several potential reasons why your TOHATSU Engine might not be starting. It could be due to an empty fuel tank, an incorrect connection in the fuel system, or air entering the fuel line. Other possible causes include a deformed or damaged fuel hose, a closed air vent on the fuel tank, or a clogged fuel filter, fuel pump, or carburetor. Using improper engine oil or gasoline, an excessive supply of fuel, or poor carburetor adjustment could also be the reason.
K
Kristin GuerraAug 19, 2025
What to do if TOHATSU Engine starting but stopping soon?
- E
  Eric RamosAug 19, 2025
  If your TOHATSU Engine starts but stops shortly after, it could be due to low compression, carbon deposits in the combustion chamber, incorrect valve clearance, or low oil pressure/level.
L
Larry MedinaAug 26, 2025
Why TOHATSU Outboard Motor has poor acceleration?
- L
  Linda HubbardAug 26, 2025
  If your TOHATSU Outboard Motor experiences poor acceleration, it could be due to: * Using improper engine oil; use the specified engine oil. * Using the wrong type of gasoline; refuel with the correct gasoline. * An excessive fuel supply; adjust the fuel supply settings. * Poor carburetor adjustment; adjust the carburetor settings accordingly.
E
Elaine FergusonSep 1, 2025
Why TOHATSU Engine has poor idling?
- M
  Michael VillarrealSep 1, 2025
  Poor idling in a TOHATSU Engine might be attributed to a low oil level, the use of improper oil, or oil deterioration. A clogged oil strainer or a faulty oil pump could also be contributing factors.

TOHATSU MFS 8A3 Specifications

General

Model	MFS 8A3
Manufacturer	TOHATSU
Category	Outboard Motor
Output	8 HP
Starting System	Manual
Control Type	Tiller
Gear Shift	F-N-R
Fuel Type	Gasoline
WOT Range	5000-6000 rpm
Gear Ratio	2.08:1
Displacement	123 cc
Shaft Length	15 in
Weight	59 lbs
Fuel Tank Capacity	12 L

Summary

Owner Registration and Identification

Pre-Delivery Check

Ensure the product has been checked by an authorized dealer before taking delivery.

Serial Number Recording

Safety Notices and Symbols

DANGER

Indicates information where failure to observe will result in severe personal injury or death.

WARNING

Indicates information where failure to observe could result in severe personal injury or death.

CAUTION

Indicates information where failure to observe could result in personal injury or property damage.

General Safety Information

Safe Operation of Boat

Operator responsibility for safe boat operation and adherence to regulations.

Emergency Stop Switch

How the emergency stop switch functions to stall the motor when the lanyard is pulled.

Personal Floatation Device (PFD)

Recommendation for operators and passengers to wear a PFD while on the boat.

Specifications

Model Feature Identification

Lists features and types available across different models.

Model Name Interpretation

Explains how to interpret the model name to understand its features.

Parts Name

MF, EF, EP Models Parts Identification

Lists and shows parts specific to MF, EF, and EP model configurations.

EFT, EPT Models Parts Identification

Lists and shows parts specific to EFT and EPT model configurations.

Remote Control Box & Fuel Tank Parts

Identifies components of the remote control box and fuel tank system.

Installation

Mounting the Outboard Motor on Boat

Step-by-step guide for securely mounting the outboard motor to the boat's transom.

Battery Installation

Procedures and safety precautions for installing the boat battery.

Pre-Operating Preparations

Fuel Handling Guidelines

Guidelines for safe handling of gasoline, including fuel rating and ethanol content.

Engine Oil Recommendation

Recommends specific SAE viscosity and API ratings for engine oil.

Break-In Procedure

Guidelines for the initial break-in period to ensure engine longevity and performance.

Engine Operation

Starting the Engine

Detailed instructions for starting the outboard motor, including safety precautions.

Forward, Reverse, and Acceleration

How to shift gears and control acceleration for forward and reverse motion.

Stopping the Engine

Procedures for safely stopping the outboard motor.

Shallow Water Operation

Guidelines and procedures for operating the motor in shallow water conditions.

Steering Operation

Trim Angle Adjustment

Tilt Up and Down Operation

Removing and Carrying the Outboard Motor

Traillering Precautions

Important considerations and warnings when trailering a boat with the motor attached.

Adjustment Procedures

Steering Friction Adjustment

How to adjust the steering friction lever for desired resistance.

Trim Tab Adjustment

Procedures for adjusting trim tabs to correct boat steering alignment.

Inspection and Maintenance

Daily Inspection Checklist

A comprehensive checklist of daily inspections before and after using the motor.

Periodic Inspection Schedule

Maintenance intervals and procedures for periodic inspections.

Engine Oil Replacement

Step-by-step guide for changing the engine oil.

Gear Oil Replacement

Step-by-step guide for changing the gear oil in the lower unit.

Off-Season Storage Procedures

Comprehensive guide for preparing and storing the outboard motor during the off-season.

Troubleshooting Guide

Tool Kit and Spare Parts

Propeller Selection Guide

Related product manuals

TOHATSU MFS 8A3 User Manual

Table of Contents

Other manuals for TOHATSU MFS 8A3

Questions and Answers:

TOHATSU MFS 8A3 Specifications

Summary

Owner Registration and Identification

Pre-Delivery Check

Serial Number Recording

Safety Notices and Symbols

DANGER

WARNING

CAUTION

General Safety Information

Safe Operation of Boat

Emergency Stop Switch

Personal Floatation Device (PFD)

Specifications

Model Feature Identification

Model Name Interpretation

Parts Name

MF, EF, EP Models Parts Identification

EFT, EPT Models Parts Identification

Remote Control Box & Fuel Tank Parts

Installation

Mounting the Outboard Motor on Boat

Battery Installation

Pre-Operating Preparations

Fuel Handling Guidelines

Engine Oil Recommendation

Break-In Procedure

Engine Operation

Starting the Engine

Forward, Reverse, and Acceleration

Stopping the Engine

Shallow Water Operation

Steering Operation

Trim Angle Adjustment

Tilt Up and Down Operation

Removing and Carrying the Outboard Motor

Traillering Precautions

Adjustment Procedures

Steering Friction Adjustment

Trim Tab Adjustment

Inspection and Maintenance

Daily Inspection Checklist

Periodic Inspection Schedule

Engine Oil Replacement

Gear Oil Replacement

Off-Season Storage Procedures

Troubleshooting Guide

Tool Kit and Spare Parts

Propeller Selection Guide

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