TOHATSU MFS 30C User Manual (English)

Other manuals for TOHATSU MFS 30C

Quick Reference Guide14 pages

Service Manual320 pages

Questions and Answers:

M
melaniekramerAug 21, 2025
Why is my TOHATSU MFS 30C difficult to start?
- R
  Ryan RobertsonAug 21, 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).
M
Mrs. Cindy Smith DDSAug 22, 2025
Why won't the starter motor crank on my TOHATSU MFS 30C Outboard Motor?
- K
  Kevin SmithAug 22, 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.
A
aliciaburtonAug 25, 2025
What to do if the starter motor won't crank on my TOHATSU MFS 30C Outboard Motor?
- A
  amy89Aug 25, 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).
K
kennethkingAug 26, 2025
Why is the speed of my TOHATSU MFS 30C low?
- H
  Hannah NovakAug 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).
D
Danielle KempAug 28, 2025
What causes the power tilt to be inoperative on a TOHATSU MFS 30C Outboard Motor?
- J
  Julie HudsonAug 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.
Q
qdeleonAug 31, 2025
What to do if starter motor will not crank in TOHATSU Engine?
- J
  Jason DonovanAug 31, 2025
  If the starter motor on your TOHATSU Engine won't crank, possible causes include: * Ignition key switch failure: Replace the ignition key switch. * Starter motor or starter solenoid failure: Check and replace the starter motor or solenoid if necessary.
S
smithjaredSep 2, 2025
Why won't the battery hold a charge on my TOHATSU MFS 30C Outboard Motor?
- A
  Angela HarrisSep 2, 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
Jeffrey EllisSep 4, 2025
How to troubleshoot a TOHATSU MFS 30C Outboard Motor battery that won't hold charge?
- H
  huntermichaelaSep 4, 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).
B
Bradley KingSep 5, 2025
What to do if the starter motor of my TOHATSU Outboard Motor will not crank?
- M
  Michael VillegasSep 6, 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).
J
Jared OneillSep 7, 2025
What does it mean if the warning lamp is “ON” on my TOHATSU Outboard Motor?
- B
  Brian ThomasSep 7, 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.

TOHATSU MFS 30C Specifications

General

Brand	TOHATSU
Model	MFS 30C
Category	Outboard Motor
Language	English

Summary

Your Tohatsu Outboard Motor

To You, Our Customer

Welcome message and introduction to the outboard motor.

Owner Registration and Identification

Importance of warranty card registration for ownership.

Pre-Delivery Check

Confirmation of dealer inspection before delivery.

Serial Number Recording

Record Your Motor's Serial Number

Space to record the serial number for future reference.

Understanding Safety Symbols

Danger, Warning, Caution, and Note Indicators

Explains the meaning of safety alert symbols used in the manual.

General Safety Information

Safe Boat Operation and Operator Responsibilities

Operator's duty for safety, knowledge, and following regulations.

Stop Switch Lanyard Function

Explanation of the stop switch lanyard's role in safety.

Personal Flotation Device (PFD) Usage

Mandate for operators and passengers to wear PFDs.

Servicing, Parts, and Lubricants

Recommended Servicing and Parts

Emphasizes using authorized shops and genuine parts.

Maintenance Precautions

Highlights hazards like carbon monoxide and gasoline flammability.

Outboard Motor Specifications

Model Feature Comparison

Compares key features across different models (F25C, F30C).

Model Name Breakdown

Explains the meaning of characters in the model name.

Outboard Motor Specifications (Cont.)

MF and E Model Specifications

Detailed technical specifications for MF and E models.

Outboard Motor Specifications (Cont. 2)

ET Model Specifications

Detailed technical specifications for ET models.

Parts Identification

MF Model Parts

Labeled diagram of parts for the MF model.

Parts Identification (Cont.)

E Model Parts

Labeled diagram of parts for the E model.

Parts Identification (Cont. 2)

ET Model Parts

Labeled diagram of parts for the ET model.

Parts Identification (Cont. 3)

Remote Control Box and Fuel Tank Parts

Labeled diagram for remote control and fuel tank components.

Label Locations

Warning Label Placement Diagram

Visual guide to the location of various warning labels on the motor.

Label Locations and Warnings

General Safety Labels and Instructions

Covers manual reference, hot surfaces, starting, and warning lamps.

Safety Device Operation Warnings

Warnings related to stop switch and lanyard usage.

Gasoline Handling Warnings

Precautions regarding gasoline flammability and handling.

Motor Handling Instructions

Instructions for laying down the outboard motor.

Label Locations and Warnings (Cont.)

Fuel Handling and Storage Warnings

Warnings about gasoline storage and tank cap usage.

Fuel System Component Warnings

Warnings related to fuel tank, primer bulb, and connectors.

Fuel Tank Cap Instructions

Specific instructions for using the fuel tank cap.

Owner's Manual Reference

Reminder to consult the owner's manual.

Label Locations (Cont.)

Emission Control Information Label

Location and explanation of the ECI label.

Installation Procedures

Mounting the Outboard Motor on a Boat

Safe methods for hanging and mounting the motor.

Transom Mounting Position

Guidance on the correct placement on the boat's transom.

Installation Procedures (Cont.)

Transom Height Matching

Proper alignment of the anti-ventilation plate to the hull.

Manual Tilt Motor Mounting

Steps for securing the outboard motor using bolts.

Installation Procedures (Cont. 2)

PT Type Motor Mounting

Mounting steps for the PT type using bolts.

Installation Procedures (Cont. 3)

Battery Installation Safety and Procedures

Warnings and steps for connecting the battery.

Installation Procedures (Cont. 4)

TOCS Installation

Installing the Tohatsu Onboard Communication System.

Pre-Operating Preparations

Fuel Handling Guidelines

Safe handling of gasoline, including types and alcohol content.

Pre-Operating Preparations (Cont.)

Fuel Filling Procedures and Warnings

Steps and precautions for safely filling the fuel tank.

Pre-Operating Preparations (Cont. 2)

Engine Oil Filling Procedure

Instructions on how to correctly fill the engine oil.

Pre-Operating Preparations (Cont. 3)

Engine Oil Recommendations and Volume

Specific oil types, viscosity, and required volume.

Pre-Operating Preparations (Cont. 4)

Outboard Motor Break-In Procedure

Steps for breaking in new engine components.

Pre-Operating Preparations (Cont. 5)

Warning System Overview

How warning buzzers and lamps alert the operator.

Warning Indicator Locations

Identifies where warning buzzers and lamps are situated.

Pre-Operating Preparations (Cont. 6)

Warning Indicators, Faults, and Remedies

Table detailing warning signals and corresponding issues.

Pre-Operating Preparations (Cont. 7)

Troubleshooting Fault Remedies

Specific actions to take for identified faults.

Engine Operation

Pre-Start Checks: Oil Level

Importance and procedure for checking engine oil.

Fuel Feeding Procedure

Steps for priming the fuel system.

Engine Operation (Cont.)

Starting the Engine

General procedures and safety for starting the motor.

Engine Operation (Cont. 2)

Tiller Handle Type Starting Procedure

Step-by-step guide for tiller handle models.

Engine Operation (Cont. 3)

Electrical Starter Type Starting

Starting process for electric start models.

Multi-Function Tiller Handle Starting

Starting process for multi-function tiller models.

Engine Operation (Cont. 4)

Side Mount RC Type Starting Procedure

Starting process for side mount remote control models.

Engine Operation (Cont. 5)

Control Lever Neutral Position

Setting the control lever to neutral.

Warning Lamp Functionality Check

Verifying the warning lamp operates correctly.

Engine Operation (Cont. 6)

Emergency Starting Procedure

How to start the engine using the emergency rope.

Engine Operation (Cont. 7)

Warming Up the Engine

Importance and duration for engine warm-up.

Engine Operation (Cont. 8)

Engine Idle Speeds

Idling speed specifications and remarks.

Free Throttle Lever Operation

How to use the free throttle lever.

Trolling Speed Control Function

Adjusting engine speed for trolling.

Engine Operation (Cont. 9)

Forward, Reverse, and Acceleration

Procedures for shifting and accelerating safely.

Engine Operation (Cont. 10)

Tiller Handle Type Shifting and Acceleration

Shifting and acceleration for tiller handle models.

Engine Operation (Cont. 11)

Side Mount RC Type Shifting and Acceleration

Shifting and acceleration for side mount RC models.

Stopping the Engine

Safe procedures for shutting down the engine.

Engine Operation (Cont. 12)

Side Mount RC Type Engine Stop

Stopping procedure for side mount RC models.

Emergency Engine Stopping

How to stop the engine quickly in an emergency.

Engine Operation (Cont. 13)

Steering Operation

How to steer the outboard motor using tiller or remote.

Emergency Stop Switch Lock

Information on the spare emergency stop switch.

Engine Operation (Cont. 14)

Trim Angle Adjustment

Importance and methods for adjusting trim angle.

Engine Operation (Cont. 15)

Manual Tilt Type Trim Adjustment

Steps for adjusting trim on manual tilt models.

Power Tilt Type Trim Adjustment

Steps for adjusting trim on power tilt models.

Engine Operation (Cont. 16)

Tilting the Motor Up and Down

Procedures for tilting the motor.

Manual Tilt Type Tilting

Steps for tilting up and down with manual tilt.

Engine Operation (Cont. 17)

Power Tilt Type Tilting

Steps for tilting up and down with power tilt.

Engine Operation (Cont. 18)

Manual Relief Valve Operation

Using the manual valve for tilting.

Shallow Water Operation

Precautions and procedures for operating in shallow water.

Engine Operation (Cont. 19)

Manual Tilt Shallow Water Position

Setting for shallow water running with manual tilt.

Power Tilt Shallow Water Position

Setting for shallow water running with power tilt.

Removing and Carrying the Outboard Motor

Removing the Outboard Motor

Steps to detach the motor from the boat.

Carrying the Outboard Motor Safely

Safety guidelines for transporting the motor.

Removing and Carrying the Outboard Motor (Cont.)

Trailering Precautions

Important considerations when trailering with the motor attached.

Removing and Carrying the Outboard Motor (Cont. 2)

Trailer Transport Securing (Tiller Handle)

Securing the motor for trailer transport with tiller handle.

Adjustment

Steering Friction Adjustment

How to adjust the steering friction lever.

Throttle Grip Friction Adjustment

How to adjust throttle grip friction.

Remote Control Lever Friction

Adjusting friction on remote control levers.

Adjustment (Cont.)

Side Mount Throttle Friction

Adjusting throttle friction on side mount controls.

Trim Tab Adjustment

How to adjust the trim tab for steering correction.

Inspection and Maintenance

Outboard Motor Care Overview

Importance of daily and periodic maintenance.

Inspection and Maintenance (Cont.)

Daily Inspection Checklist

Essential checks before and after operating the motor.

Inspection and Maintenance (Cont. 2)

Engine Oil Level Checking and Replenishing

Procedures for checking and adding engine oil.

Inspection and Maintenance (Cont. 3)

Washing and Flushing the Outboard Motor

How to clean and flush the motor.

Flushing Hose Connection

Connecting a hose for flushing the motor.

Inspection and Maintenance (Cont. 4)

Flushing with a Test Tank

Procedure for flushing using a test tank.

Fuse Replacement Procedure

Steps for safely replacing a blown fuse.

Inspection and Maintenance (Cont. 5)

Periodic Inspection Schedule

Regular maintenance intervals and tasks.

Inspection and Maintenance (Cont. 6)

Engine Oil Replacement

Step-by-step guide for changing engine oil.

Inspection and Maintenance (Cont. 7)

Oil Filter Replacement

How to replace the engine oil filter.

Inspection and Maintenance (Cont. 8)

Fuel Filter and Tank Cleaning

Procedures for cleaning fuel filters and tank.

Inspection and Maintenance (Cont. 9)

Fuel Filter (for Fuel Tank)

Cleaning/replacing the fuel filter in the tank.

Gear Oil Replacement

Steps for draining and refilling gear oil.

Inspection and Maintenance (Cont. 10)

Propeller Replacement Precautions

Warnings and safety for propeller replacement.

Inspection and Maintenance (Cont. 11)

Spark Plug Replacement

How to inspect, gap, and replace spark plugs.

Inspection and Maintenance (Cont. 12)

Anode Replacement

How and when to replace the sacrificial anode.

Inspection and Maintenance (Cont. 13)

Power Tilt Oil Checking

How to check the oil level in the power tilt unit.

Inspection and Maintenance (Cont. 14)

Grease Points for Lubrication

Locations where waterproof grease should be applied.

Inspection and Maintenance (Cont. 15)

Off-Season Storage Procedures

Steps for preparing the motor for storage.

Engine Preparation for Storage

Specific tasks for the engine during storage.

Inspection and Maintenance (Cont. 16)

Adding Fuel Stabilizer for Storage

How to use fuel stabilizer for long-term storage.

Inspection and Maintenance (Cont. 17)

Fuel System Draining

Procedure for draining all fuel from the system.

Battery Care for Storage

Proper procedures for storing the battery.

Inspection and Maintenance (Cont. 18)

Pre-Season Checks After Storage

Steps before using the motor after off-season.

Submerged Outboard Motor Emergency Measures

Emergency steps if the motor is submerged.

Inspection and Maintenance (Cont. 19)

Cold Weather Operating Precautions

Safety measures for cold weather operation.

Actions After Striking Underwater Objects

What to do if the motor hits an object.

Multiple Outboard Motor Operation

Considerations for running multiple engines.

Troubleshooting

Fuel System Issues and Solutions

Common fuel system problems and their remedies.

Troubleshooting (Cont.)

Compression, Oil System, and Other Issues

Solutions for compression, oil, and miscellaneous problems.

Tool Kit and Spare Parts

Included Tools and Spare Parts List

Inventory of tools and spare parts provided.

Propeller Selection Guide

Recommended Propeller Sizes

Table showing propeller marks and sizes for different boats.

Emission Control System Information

Emission Sources and Control Systems

Explains emissions and control mechanisms like ignition timing.

Fuel Injection System Function

How the fuel injection system manages emissions.

Emission Control System Information (Cont.)

Symptoms Affecting Emission Performance

Issues that can impact emission compliance.

Importance of Genuine Replacement Parts

Recommends using Tohatsu Genuine parts for emission systems.

Fuel Hose Requirements

Specifications for fuel hoses in US and Canada.

Emission Control System Information (Cont. 2)

Pressurized Fuel Tank Requirements

EPA requirements for portable fuel tanks.

EPA Approved Primer Bulb/Hose Assembly

Requirements for primer bulb and hose assemblies.

Emission Control System Information (Cont. 3)

Maintenance Schedule Reference

Refers to the maintenance schedule on page 70.

California Air Resources Board (CARB) Star Labels

Explanation of the CARB star label system.

One Star Emission Label

Details on the One Star Low Emission label.

Emission Control System Information (Cont. 4)

Two Star Emission Label

Details on the Two Star Very Low Emission label.

Four Star Emission Label

Details on the Four Star Super Ultra Low Emission label.

Related product manuals

TOHATSU MFS 30C User Manual

Table of Contents

Other manuals for TOHATSU MFS 30C

Questions and Answers:

TOHATSU MFS 30C Specifications

Summary

Your Tohatsu Outboard Motor

To You, Our Customer

Owner Registration and Identification

Pre-Delivery Check

Serial Number Recording

Record Your Motor's Serial Number

Understanding Safety Symbols

Danger, Warning, Caution, and Note Indicators

General Safety Information

Safe Boat Operation and Operator Responsibilities

Stop Switch Lanyard Function

Personal Flotation Device (PFD) Usage

Servicing, Parts, and Lubricants

Recommended Servicing and Parts

Maintenance Precautions

Outboard Motor Specifications

Model Feature Comparison

Model Name Breakdown

Outboard Motor Specifications (Cont.)

MF and E Model Specifications

Outboard Motor Specifications (Cont. 2)

ET Model Specifications

Parts Identification

MF Model Parts

Parts Identification (Cont.)

E Model Parts

Parts Identification (Cont. 2)

ET Model Parts

Parts Identification (Cont. 3)

Remote Control Box and Fuel Tank Parts

Label Locations

Warning Label Placement Diagram

Label Locations and Warnings

General Safety Labels and Instructions

Safety Device Operation Warnings

Gasoline Handling Warnings

Motor Handling Instructions

Label Locations and Warnings (Cont.)

Fuel Handling and Storage Warnings

Fuel System Component Warnings

Fuel Tank Cap Instructions

Owner's Manual Reference

Label Locations (Cont.)

Emission Control Information Label

Installation Procedures

Mounting the Outboard Motor on a Boat

Transom Mounting Position

Installation Procedures (Cont.)

Transom Height Matching

Manual Tilt Motor Mounting

Installation Procedures (Cont. 2)

PT Type Motor Mounting

Installation Procedures (Cont. 3)

Battery Installation Safety and Procedures

Installation Procedures (Cont. 4)

TOCS Installation

Pre-Operating Preparations

Fuel Handling Guidelines

Pre-Operating Preparations (Cont.)

Fuel Filling Procedures and Warnings

Pre-Operating Preparations (Cont. 2)

Engine Oil Filling Procedure

Pre-Operating Preparations (Cont. 3)

Engine Oil Recommendations and Volume

Pre-Operating Preparations (Cont. 4)

Outboard Motor Break-In Procedure

Pre-Operating Preparations (Cont. 5)

Warning System Overview

Warning Indicator Locations

Pre-Operating Preparations (Cont. 6)

Warning Indicators, Faults, and Remedies

Pre-Operating Preparations (Cont. 7)

Troubleshooting Fault Remedies

Engine Operation