TOHATSU MFS 9.8A3 User Manual (English)

Other manuals for TOHATSU MFS 9.8A3

Questions and Answers:

R
Ryan LewisJul 31, 2025
Why my TOHATSU MFS 9.8A3 Outboard Motor engine falling to start?
- L
  lindasmithJul 31, 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.
H
howelljamesAug 6, 2025
Why is my TOHATSU Engine failing to start?
- M
  mary51Aug 6, 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.
S
Stephanie CooperAug 12, 2025
What to do if TOHATSU Engine starting but stopping soon?
- A
  andersonstanleyAug 13, 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.
K
Kerry WalterAug 18, 2025
Why TOHATSU Outboard Motor has poor acceleration?
- L
  lekimberlyAug 19, 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.
B
Brandon CohenAug 25, 2025
Why TOHATSU Engine has poor idling?
- S
  Stephanie LyonsAug 25, 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 9.8A3 Specifications

General

Power Output	9.8 HP
Starting	Manual
Fuel Tank Capacity	12 L
Gear Ratio	2.08:1
Displacement	209 cc
Fuel Type	Unleaded gasoline
Max. RPM	6000 rpm
Ignition System	CDI
Engine Type	2-cylinder, 4-stroke

Summary

Owner Registration and Initial Checks

Owner Registration and Identification Process

Process for warranty registration and product identification.

Pre-Delivery Inspection Confirmation

Ensures the product has been inspected by a dealer before delivery.

Serial Number Recording and Warning Symbol Guide

Serial Number Recording for Inquiries

Space to record the outboard motor's serial number for inquiries.

Understanding Warning Symbols

Explains the meaning of DANGER, WARNING, CAUTION, and Note indicators.

General Safety Information and Recommendations

Safe Boat Operation and Safety Equipment

Operator responsibility for safety, PFDs, and emergency stop switch usage.

Servicing, Parts, Lubricants, and Maintenance Hazards

Recommendations for maintenance services, parts, lubricants, and hazards of CO/gasoline.

Specifications and Model Identification

Model Feature and Name Explanation

Details on model features, types, and how to interpret model names.

Parts Identification

Engine Component Identification (MF, EF, EP, EFT, EPT)

Identifies key parts for different engine models (MF, EF, EP, EFT, EPT).

Remote Control and Fuel Tank Components

Identifies components of the remote control system and fuel tank.

Label Locations and Identification

Warning and CE Label Identification

Shows locations and meanings of warning labels and CE marking information.

Outboard Motor Installation Procedures

Motor Mounting, Positioning, and Transom Matching

Steps for securely attaching the motor, ensuring correct placement and transom fit.

Remote Control and Battery Installation

Procedures for installing the remote control system and connecting the battery safely.

Pre-Operating Preparations and Checks

Fuel Handling, Filling, and Rating

Guidelines for safe fuel handling, filling, octane ratings, and ethanol content.

Engine Oil Recommendation and Break-In

Specifies recommended engine oil and the procedure for engine break-in.

Warning System Functionality

Explains the warning horn and lamp indicators for engine faults.

Engine Operation and Control

Pre-Start Checks, Fueling, and Starting

Essential checks, fueling, and procedures for starting the engine.

Engine Warm-Up, Speed Control, and Stopping

Procedures for warming up, controlling speed, and stopping the engine.

Steering, Trim Angle, Tilt Operations, and Shallow Water Use

How to steer, adjust trim, tilt motor, and operate in shallow water.

Removing and Carrying the Outboard Motor

Motor Removal, Carrying, and Traillering

Steps for removing, safely carrying, and trailering the outboard motor.

Adjustments for Optimal Performance

Steering, Throttle, and Control Lever Friction Adjustment

Adjusting friction for steering, throttle grip, and remote control levers for smooth operation.

Trim Tab Adjustment for Boat Trim

Adjusting the trim tab to correct boat steering and trim issues.

Inspection and Maintenance Procedures

Motor Care, Daily Checks, and Periodic Inspections

General care, daily checks, and scheduled periodic inspections for the motor.

Engine Oil and Gear Oil Maintenance

Procedures for checking, replenishing, and replacing engine and gear oil.

Washing, Flushing, and Fuse Replacement

Procedures for cleaning, flushing cooling passages, and replacing fuses.

Fuel System Maintenance and Draining

Cleaning fuel filters, fuel tank, and draining the fuel system.

Propeller, Spark Plugs, and Anode Replacement

Procedures for replacing propeller, spark plugs, and anodes.

Power Tilt Oil, Grease Points, and Storage Prep

Checking power tilt oil, purging air, and identifying grease application points.

Post-Storage Checks, Battery Care, and Emergency Procedures

Checks after storage and emergency procedures for a submerged motor.

Cold Weather Precautions and Object Impact Response

Advice for operating in cold weather and procedures after striking an object.

Troubleshooting Common Issues

Troubleshooting Guide for Engine and Electrical Issues

Identifies common problems and their potential causes and remedies.

Tool Kit and Spare Parts Inventory

Included Tools and Spare Parts List

Lists the tools and spare parts provided with the outboard motor.

Propeller Selection Guide

Propeller Selection Guide for Boat Types

Recommends propeller sizes based on boat type and desired RPM range.

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