TOHATSU MFS 115A - User Manual

Questions and Answers

W
Walter JonesAug 16, 2025
Why TOHATSU MFS 115A will not start?
- J
  Joshua ValdezAug 17, 2025
  If your TOHATSU Outboard Motor won't start, several factors could be the cause. It could be due to: * Low fuel level: Check the fuel level and refill if necessary. * Incomplete fuel system connection: Check for incomplete connections in the fuel system. * Air in the fuel system: Inspect the fuel system for leaks that may allow air to enter. * Twisted fuel pipe: Ensure the fuel pipe is not twisted. * Closed cap vent: Open the cap vent. * Clogged fuel filter, fuel pump, or injector: Clean or replace the clogged component. * Deteriorated fuel pump or vapor separator: Evaluate and replace the deteriorated component. * Low quality fuel: Use high quality fuel.
D
Dustin FranklinAug 19, 2025
What to do if my TOHATSU MFS 115A Outboard Motor stalls immediately after starting?
- T
  Taylor PaulAug 19, 2025
  If your TOHATSU Outboard Motor stalls right after starting, consider these potential causes: * Incomplete fuel system connection: Check for incomplete connections in the fuel system. * Air in the fuel system: Inspect the fuel system for leaks that may allow air to enter. * Twisted fuel pipe: Ensure the fuel pipe is not twisted. * Closed cap vent: Open the cap vent. * Clogged fuel filter, fuel pump, or injector: Clean or replace the clogged component. * Deteriorated fuel pump or vapor separator: Evaluate and replace the deteriorated component. * Low quality fuel: Use high quality fuel.
A
angelica75Aug 22, 2025
What causes TOHATSU MFS 115A Outboard Motor power tilt not to operate?
- C
  churchalbertAug 22, 2025
  If the power tilt on your TOHATSU Outboard Motor isn't working, the PTT switch or solenoid might be defective. Inspect and replace the PTT switch or solenoid if necessary.
E
Eric RaymondAug 30, 2025
What causes TOHATSU Outboard Motor to overheat?
- R
  Richard ColemanAug 30, 2025
  The TOHATSU Outboard Motor may overheat if there is a lack of cooling water, which can be caused by a defective or clogged water pump. Check cooling water levels and inspect the water pump.
A
Ashley OlsenSep 2, 2025
What to do if TOHATSU MFS 115A Outboard Motor battery is not charged?
- A
  Antonio BradleySep 2, 2025
  If the battery of your TOHATSU Outboard Motor is not charging, it could be due to a defective battery charging system or a malfunctioning rectifier. Check the battery charging system and replace the rectifier if it is not working correctly. Another possible reason is a dead battery, loose or corroded connections, or low battery electrolyte level. In this case, charge or replace the battery and clean the connections.
E
Elizabeth RogersSep 5, 2025
What to do if TOHATSU MFS 115A Outboard Motor starter motor will not operate?
- K
  Kelli RaySep 5, 2025
  If the starter motor of your TOHATSU Outboard Motor will not operate, the starter motor or starter solenoid operation may be defective. Check the operation of the starter motor and solenoid.
J
Judy MitchellSep 7, 2025
What does it mean when warning lamp A is 'ON'/'Flash' on TOHATSU Outboard Motor?
- E
  Edward DavisSep 7, 2025
  If warning lamp A is 'ON' or flashing on your TOHATSU Outboard Motor, it indicates defective wiring, a ground issue, or a disconnected or loosened wire. Check and repair any defective wiring and connections.
J
Jerome WoodsSep 12, 2025
What to do if warning buzzer is 'ON' on TOHATSU MFS 115A?
- K
  Kimberly BrockSep 12, 2025
  If the warning buzzer is 'ON' on your TOHATSU Outboard Motor, it suggests defective wiring, a ground issue, or a wire that is disconnected or loosened. Check and repair any defective wiring and connections.
J
Jessica GuerreroNov 23, 2025
What to do if my TOHATSU Outboard Motor engine will not start?
- C
  castrojoseNov 24, 2025
  If your TOHATSU Outboard Motor engine refuses to start, begin by checking the fuel level and refilling if necessary. Make sure that the fuel system connections are secure and that there are no leaks causing air to be sucked into the system. Also, ensure that the fuel pipe isn't twisted and that the cap vent is open. Examine the fuel filter, fuel pump, and injector for clogs; clean or replace them if needed. If the fuel pump or vapor separator performance has deteriorated, replace them. Using high-quality fuel is also important. Check the primer bulb for clogs, cleaning or replacing it as necessary. Inspect the battery, ensuring it's charged and connections are secure and free of corrosion. Replace any blown fuses. Confirm that the shift lever is in the neutral position. If problems persist...
M
Michael FrenchNov 26, 2025
What to do if my TOHATSU Engine will not start?
- J
  Jasmine GallagherNov 26, 2025
  If your TOHATSU Engine won't start, several issues could be the cause. Here are some things to check: * Ensure the fuel tank has an adequate fuel level; if low, fill it. * Verify the fuel system connections are complete and secure. * Inspect the fuel system for any leaks that may cause air suction. * Check the fuel pipe and straighten it if twisted. * Open the cap vent if it's closed. * Inspect and clean or replace a clogged fuel filter, fuel pump, or injector. * Service or replace the fuel pump or vapor separator if their performance has deteriorated. * Use a higher quality fuel if low quality fuel is the cause. * Inspect and replace the starter motor or solenoid if their operation is defective. * Charge the battery and check connections if the battery is dead, or the...

Summary

GENERAL SAFETY INFORMATION

Safe Operation and PFD Use

Operator responsibilities, safe boat handling, and mandatory PFD use for all aboard.

Stop Switch Lanyard and Hazard Warnings

Proper use of the emergency stop switch lanyard and warnings about fuel/gasoline hazards.

SPECIFICATIONS, PARTS & LABELS

Model Specifications and Component Identification

Details on model features, naming conventions, and identification of outboard motor parts.

Warning Label Locations and Emission Standards

Locates warning labels and explains emission standards and labels on the outboard motor.

INSTALLATION & PRE-OPERATION

Outboard Motor Mounting and Battery;Propeller Installation

Guidelines for mounting the motor, installing the battery, and fitting the propeller.

Fuel, Oil, and Break-In Procedures

Instructions for fuel handling, engine oil filling, and the initial break-in period.

ENGINE OPERATION

Starting, Warming Up, and Stopping Procedures

Step-by-step guide for safely starting, warming up, and stopping the outboard motor.

Control Inputs: Shifting, Throttle, Steering, and Trim

How to operate controls for forward/reverse, acceleration, steering, and trim angle.

Special Operations: Tilting and Shallow Water

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

MAINTENANCE, STORAGE & TROUBLESHOOTING

Daily and Periodic Inspection Schedules

Recommended inspection checks and maintenance intervals for regular upkeep of the motor.

Key Maintenance Tasks and Procedures

Covers oil changes, filter replacement, spark plugs, anodes, and fluid checks.

Off-Season Storage and Troubleshooting Guide

Steps for preparing the motor for storage and a guide to resolving common operational issues.

ACCESSORIES, PROPELLERS & EMISSIONS

Included Accessories and Propeller Selection

List of provided tools/parts and guidance for selecting the correct propeller size.

Emission Control System Information

Information on engine emissions, control systems, standards, and labels.

TOHATSU MFS 115A Specifications

General

Engine Type	4-Stroke
Horsepower	115 HP
Fuel System	Electronic Fuel Injection (EFI)
Starting System	Electric
Operating Range	5000 - 6000 RPM
Gear Ratio	2.08:1
Steering	Remote
Valves/Cylinder	4
Shaft Length	20", 25"
Cooling System	Water Cooled
Full Throttle RPM Range	5000 - 6000 RPM
Engine Type Detail	Inline 4-cylinder