TOHATSU M 9.9 User Manual (English)

Questions and Answers:

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Elizabeth GreeneAug 10, 2025
What to do if TOHATSU M 9.9 Outboard Motor engine starting but stopping soon?
- D
  devin08Aug 10, 2025
  If your TOHATSU Outboard Motor engine starts but stops soon after, the issue might stem from a few key areas. Begin by checking the battery terminal connections for looseness or corrosion; tighten the terminals and clean off any corrosion. A discharged battery could also be the cause, so recharge or replace it. Inspect the main switch for any issues and repair as needed. Ensure the lock plate is properly fitted to the stop switch. Additionally, check for any disconnected wires or loose ground connections and reconnect them. Insufficient battery capacity can also lead to this problem, so verify the battery's capacity and ensure all connections are clean and secure.
R
Ronald VargasAug 17, 2025
Why is my TOHATSU M 9.9 overheating?
- C
  Christopher FullerAug 17, 2025
  The overheating of your TOHATSU Outboard Motor engine can be attributed to a few potential issues related to cooling. Insufficient cooling water flow, possibly due to a clogged or defective pump, is a primary suspect; check for any blockages and repair or replace the pump as necessary. Another cause could be a faulty thermostat, which would require replacement. Also, diagnose and correct any cavitation or ventilation issues that might be occurring.
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Robert MullinsAug 25, 2025
How to improve acceleration of TOHATSU M 9.9?
- P
  Patrick FlemingAug 26, 2025
  Poor acceleration in your TOHATSU Outboard Motor can arise from several factors related to the propeller, boat load, and engine setup. Start by ensuring you've selected the correct propeller for your setup. Inspect the propeller for any damage or bending, and repair or replace it if needed. Adjust the thrust rod position to the proper setting. Make sure the load on the boat is balanced evenly. Lastly, check that the transom height is correctly adjusted, as a transom that's too high or too low can affect acceleration.

TOHATSU M 9.9 Specifications

General

Brand	TOHATSU
Model	M 9.9
Category	Outboard Motor
Language	English

Summary

General Safety Information

Safety Alerts and Precautions

Explains safety alert levels (DANGER, WARNING, CAUTION) and general notes for safe operation.

Emergency Stop Switch Usage

Details the function and warnings associated with the emergency stop switch and its tether.

Safe Boat Operation

Outlines the operator's responsibility for safe boating and following regulations.

Servicing and Parts Recommendations

Recommends using authorized service shops and genuine parts for maintenance.

Owner's Maintenance Responsibility

Emphasizes the owner's duty to perform safety checks and adhere to maintenance instructions.

Professional Mounting Guidelines

Specifies that outboard motor mounting must be performed by trained personnel using appropriate equipment.

Specifications

9.9D2, 9.9D2 EF, 9.9D2 EP Specifications

Provides detailed technical specifications for the 9.9D2, 9.9D2 EF, and 9.9D2 EP outboard motor models.

15D2, 15D2 EF, 15D2 EP Specifications

Provides detailed technical specifications for the 15D2, 15D2 EF, and 15D2 EP outboard motor models.

18E2, 18E2 EF, 18E2 EP Specifications

Provides detailed technical specifications for the 18E2, 18E2 EF, and 18E2 EP outboard motor models.

Names of Parts

Parts Identification (9.9D2, 15D2, 18E2)

Diagrams and labels identifying key external and internal components of the 9.9D2, 15D2, and 18E2 models.

Parts Identification (9.9D2 EF, 15D2 EF, 18E2 EF)

Diagrams and labels identifying key external and internal components of the 9.9D2 EF, 15D2 EF, and 18E2 EF models.

Parts Identification (9.9D2 EP, 15D2 EP, 18E2 EP)

Diagrams and labels identifying key external and internal components of the 9.9D2 EP, 15D2 EP, and 18E2 EP models.

Installation

Mounting the Outboard Motor

Instructions for correctly mounting the outboard motor onto the boat transom, including transom matching.

Installing Remote Control Devices

Steps for connecting and setting up remote control cables, harness, and components.

Installing the Battery

Guidelines for safely placing, securing, and connecting the outboard motor's battery.

Pre-Operating Preparations

Recommended Gasoline Types

Guidance on selecting the correct type and octane of unleaded gasoline for optimal motor performance.

Recommended Engine Oil and Mixing

Specifies the correct engine oil and fuel-to-oil mixing ratios for standard operation and break-in.

Engine Break-In Procedure

Detailed steps and a time table for properly breaking in the new outboard motor.

Engine Operation

Starting the Engine

Step-by-step instructions for safely starting the outboard motor, including safety warnings.

Engine Warm-up and Shifting

Procedures for warming up the engine and safely shifting between forward, neutral, and reverse gears.

Stopping the Engine

Instructions on how to safely shut down the outboard motor using the stop switch or key.

Motor Positioning and Shallow Water Handling

Guidance on adjusting trim angle, tilting the motor, and operating in shallow water conditions.

Removing, Carrying, and Storing the Outboard Motor

Removing the Outboard Motor

Steps for safely disconnecting and removing the outboard motor from the boat.

Carrying the Outboard Motor

Proper methods and safety precautions for transporting the outboard motor.

Storing the Outboard Motor

Guidelines for storing the outboard motor to prevent damage and ensure readiness.

Trailering Precautions

Adjustment

Steering Friction Adjustment

How to adjust the steering resistance using the steering adjusting bolt for comfort.

Remote Control Lever Load Adjustment

Adjusting the throttle friction using the adjustment screw for smooth control.

Trim Tab Adjustment

How to adjust the trim tab to correct boat steering tendencies.

Inspection and Maintenance

Daily Inspection and Checks

Routine checks for safe operation and performance before and after each use.

Routine Maintenance Procedures

Covers washing, fuel system cleaning, gear oil replacement, and off-season storage preparation.

Component Replacement and Periodic Servicing

Guidance on replacing wear parts (propeller, spark plugs, anode) and periodic servicing schedules.

Special Condition Precautions and Checks

Includes pre-season checks, battery care, cold weather, submerged motor, and post-impact procedures.

Troubleshooting Common Engine Issues

Included Tools and Spare Parts

Available Optional Accessories

Propeller Selection Guide

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