TOHATSU MFS 25C - User Manual

Other manuals for TOHATSU MFS 25C

Quick Reference Guide14 pages

Service Manual320 pages

Questions and Answers

A
arthur33Aug 19, 2025
Why is my TOHATSU MFS 25C difficult to start?
- B
  Bryan RussellAug 19, 2025
  There are several reasons why your TOHATSU Outboard Motor might be hard to start. It could be due to an empty fuel tank, so ensure you fill it. Other potential causes include an incorrect fuel system connection (check and correct it), air entering the fuel line (inspect for leaks), a deformed or damaged fuel hose (replace it), a closed air vent on the fuel tank (open it), a clogged fuel filter, vapor separator, or fuel pump (clean or replace the clogged components), a fuel pump malfunction (inspect and repair), use of improper engine oil (use the correct oil), use of improper gasoline (refuel with the correct type), or high pressure fuel pump (FFP) low performance or clogging (check performance and clean/correct the fuel pump).
R
Roy RogersAug 21, 2025
Why won't the starter motor crank on my TOHATSU MFS 25C?
- W
  wreeseAug 21, 2025
  If the starter motor on your TOHATSU Outboard Motor will not crank, check whether the battery is weak or if the battery connections are loose or corroded; tighten or replace them as necessary. If the ignition key switch has failed, replace it. If the starter motor or starter solenoid has failed, repair or replace it.
N
Nicholas AndersonAug 23, 2025
What to do if the starter motor won't crank on my TOHATSU MFS 25C Outboard Motor?
- D
  Don MoranAug 23, 2025
  If the starter motor on your TOHATSU Outboard Motor isn't cranking, it could be due to several reasons: * The engine might not be in neutral (ensure it is). * The battery voltage could be low (charge the battery). * There might be an ignition key switch failure (replace the switch). * The starter motor or starter solenoid might have failed (inspect and replace if necessary).
R
Robert BallardAug 26, 2025
Why is the speed of my TOHATSU MFS 25C low?
- W
  William VargasAug 26, 2025
  The low speed of your TOHATSU Outboard Motor may be due to several factors: low compression (inspect and resolve compression issues), carbon deposits in the combustion chamber (clean the combustion chamber), incorrect valve clearance (adjust the valve clearance), low oil pressure/level, oil pump failure, clogged oil filter (check oil pressure and level and inspect the oil pump), insufficient cooling water flow, clogged or defective pump (check the cooling system for blockages), or incorrect valve timing (verify and adjust the valve timing).
A
adamskennethAug 28, 2025
What causes the power tilt to be inoperative on a TOHATSU Outboard Motor?
- A
  Adam FischerAug 28, 2025
  If the Power Tilt on your TOHATSU Outboard Motor is inoperative, it may be due to a defective power tilt switch or solenoid. Check and replace the power tilt switch or solenoid.
J
Jeffrey RichardsonAug 30, 2025
Why won't the battery hold a charge on my TOHATSU MFS 25C?
- J
  jillian55Aug 30, 2025
  If the battery of your TOHATSU Outboard Motor won't hold a charge, it may be due to a weak battery or loose/corroded battery connections. Check the battery's condition and tighten or clean the connections.
J
Joseph WellsSep 2, 2025
How to troubleshoot a TOHATSU Outboard Motor battery that won't hold charge?
- J
  Jessica AllenSep 2, 2025
  If the battery of your TOHATSU Outboard Motor won't hold a charge, it could be due to a weak battery or loose/corroded connections (check, clean, and tighten the connections). Alternatively, the battery voltage may be low (charge or replace the battery if faulty).
K
Kathleen GonzalezSep 4, 2025
What to do if the starter motor of my TOHATSU MFS 25C Outboard Motor will not crank?
- A
  Alejandra KingSep 4, 2025
  If the starter motor of your TOHATSU Outboard Motor won't crank, ensure the gear is in neutral. If it still doesn't crank, the ignition key switch might have failed (replace it), or the starter motor/solenoid might have failed (service or replace them).
B
Bryan JacksonSep 6, 2025
What does it mean if the warning lamp is “ON” on my TOHATSU MFS 25C Outboard Motor?
- D
  Daniel BrennanSep 6, 2025
  If the warning lamp is ON on your TOHATSU Outboard Motor, it indicates that electrical components are out of range or there's an improper/loose wiring connection. Check wiring connections and component ranges.
S
Sarah MccoySep 8, 2025
What does it mean if the warning buzzer is “ON” on my TOHATSU Outboard Motor?
- J
  John MorrisSep 9, 2025
  If the warning buzzer is ON on your TOHATSU Outboard Motor, it could indicate a defective power tilt switch or solenoid. Inspect and replace the power tilt switch or solenoid.

Summary

Safety Notices

Danger, Warning, Caution Levels

Explains severity levels of safety alerts.

General Safety Information

Stop Switch Lanyard Use

Proper use of the emergency stop switch.

Hazard Awareness (Gasoline & CO)

Hazards of carbon monoxide and gasoline.

Outboard Motor Installation

Mounting and Battery Installation

Steps for securely mounting the motor and installing the battery.

Pre-Operation Preparations

Fuel Handling and Filling

Guidelines for safe fuel use and refueling.

Engine Oil Filling and Recommendations

Correct procedure for adding engine oil and selection.

Engine Break-In and Warning System

Initial engine break-in and fault indicator overview.

Engine Operation

Starting the Engine

Step-by-step guide to starting the motor.

Forward, Reverse, and Acceleration

Shifting gears and controlling speed.

Steering, Trim, and Tilt

Shallow Water Operation

Inspection and Maintenance

Daily and Periodic Inspection

Storage and Seasonal Preparation

Emergency & Weather Precautions

Troubleshooting Guide

Common Engine Faults and Remedies

TOHATSU MFS 25C Specifications

General

Power Output	25 HP
Starting System	Electric
Fuel Delivery System	Electronic Fuel Injection (EFI)
Gear Ratio	2.08:1
Displacement	526 cc
Fuel Type	Gasoline
Max. RPM	5000-6000
Shaft Length	20 in
Steering	Tiller
Trim System	Power Trim
Engine Type	4-Stroke