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Suzuki DF115B - User Manual

Suzuki DF115B
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ENGLISH
DF115B
DF140B
OWNER’S MANUAL

Questions and Answers

  • J
    Jonathan DavisAug 15, 2025
    What to do if my Suzuki Outboard Motor engine will not start?
    • D
      derekfinleyAug 15, 2025
      If your Suzuki Outboard Motor's engine will not start or is hard to start, consider these potential causes: * The fuel tank might be empty. * The fuel hose may not be properly connected to the engine. * The fuel hose could be kinked or pinched. * The spark plug might be fouled.
  • A
    Anthony PriceAug 18, 2025
    How to fix a Suzuki DF115B when the starter motor will not operate?
    • E
      Erin DeleonAug 18, 2025
      If the starter motor of your Suzuki Outboard Motor will not operate, make sure that: * The shift lever is in NEUTRAL. * The fuse is not blown out. * The emergency stop switch lock plate is in the correct position.
  • R
    Raymond KellyAug 21, 2025
    What causes my Suzuki DF115B to overheat?
    • J
      Jaclyn SchultzAug 22, 2025
      If your Suzuki Outboard Motor engine overheats, check if the cooling water intakes are blocked. Also, avoid overloading the engine and ensure the propeller is properly matched to the loads.
  • D
    Deborah LyonsAug 26, 2025
    What to do if Suzuki Outboard Motor engine idles unstably or stalls?
    • C
      Colton RomeroAug 26, 2025
      If your Suzuki Outboard Motor engine idles unstably or stalls, the issue might be a kinked or pinched fuel hose, or a fouled spark plug. Inspect these components to resolve the problem.
  • I
    Isabella CoxAug 28, 2025
    Why does my Suzuki DF115B Outboard Motor vibrate excessively?
    • C
      Christopher MorganAug 28, 2025
      If your Suzuki Outboard Motor's engine vibrates excessively, check the following: * Ensure that the engine mounting bolts or clamp screws are not loose. * Inspect the propeller for any foreign objects tangled on it, such as seaweed. * Examine the propeller for damage.
  • J
    John EdwardsSep 1, 2025
    Why Suzuki Outboard Motor engine speed will not increase?
    • J
      Jason HallSep 1, 2025
      If your Suzuki Outboard Motor engine speed will not increase or the engine power is low, consider these potential causes: * The engine might be overloaded. * The Caution/Diagnosis system could be activated. * The propeller may be damaged or not properly matched to the loads.
  • G
    gabrielaschultzSep 4, 2025
    What to do if the Suzuki DF115B Keyless Start System does not turn ON (no error sound)?
    • D
      Darryl ClineSep 4, 2025
      If the Keyless Start System of your Suzuki Outboard Motor does not turn ON even when the main switch is operated, and you DO NOT hear the error sound (five short buzzer beeps), check the following: * Ensure the emergency stop switch lock plate is in position. * Avoid continuous operation of the main switch while communication with the keyless fob is disabled. * Check for corroded or lost battery terminal connections. * Ensure the battery has power. * Consider the possibility of a keyless control unit failure, loose electric wiring connections, or a remote control box failure.
  • P
    Paul ScottSep 7, 2025
    What to do if the Suzuki Outboard Motor Keyless Start System does not turn ON (error sound heard)?
    • A
      alex67Sep 7, 2025
      If the Keyless Start System of your Suzuki Outboard Motor does not turn ON even when the main switch is operated, and you DO hear the error sound (five short buzzer beeps), consider these potential causes: * The keyless fob may be outside the operating range or have a dead battery. * The keyless fob might be in OFF mode or not authenticated. * There could be a communication failure due to strong radio waves or noise. * Check for electric wiring connection failure between the keyless control unit and outboard motor. * There might be an authentication error between the keyless control unit and outboard motor, or an abnormality in the electronic control system of the engine.
  • J
    Jennifer GordonSep 12, 2025
    Why Suzuki Outboard Motor Keyless Start System does not turn OFF?
    • M
      Mr. Nathaniel Garcia Jr.Sep 12, 2025
      If the Keyless Start System on your Suzuki Outboard Motor does not turn OFF even when the main switch is operated, there may be a loose electric wiring connection or a remote control box failure. Check these components to resolve the issue.

Summary

Important Safety Notices

Signal Word Definitions

Explains the meaning of signal words like Warning, Caution, and Notice.

Owner Safety Advisories

Provides critical safety advice for outboard motor owners.

Identification and Fuel Information

Fuel and Oil Guidelines

Covers recommended gasoline types, octane ratings, and ethanol blends.

Motor Mounting and Battery Installation

Motor Mounting Precautions

Advises against exceeding maximum horsepower and recommends professional installation.

Suzuki Keyless Start System

System Overview and Operation

Explains how the keyless start system operates and its components.

Keyless Fob and Immobilizer

Describes the keyless fob, its functions, and the immobilizer system.

Keyless Fob Operation and Maintenance

Switching Communication Mode

Instructions for switching the keyless fob between ON and OFF modes.

Keyless Fob Battery Replacement

Step-by-step guide for replacing the keyless fob battery.

Passcode Setting and Changing

Passcode Setting Procedure

Detailed steps for setting or changing the 4-digit engine start passcode.

Propeller Selection and Installation

Propeller Selection Guidelines

Explains how to choose a propeller matched to the boat's characteristics.

Propeller Installation Procedure

Step-by-step instructions for installing a propeller on the outboard motor.

Motor Trim Angle Adjustment

Trim Angle Warnings

Highlights risks associated with incorrect trim angles and exceeding max trim.

Caution System Overview

Caution System Functionality

Explains the purpose of caution systems and potential damage from ignoring them.

Indicator Check Procedure

Describes how to check the monitor-tachometer indicators and buzzer.

Specific Caution Systems

Over-Revolution Caution System

Details what happens when engine speed exceeds limits and how the system responds.

Oil Pressure Caution System

Explains activation when oil pressure drops and its effect on engine speed.

Battery and Keyless System Cautions

Keyless Fob Caution System

Describes caution for keyless fob identification errors.

Diagnostic System

Engine Stalling and Water in Fuel Alerts

Pre-Boating Inspection

Break-In Procedures

Starting the Engine

Critical Safety Warnings

Critical safety warnings related to the emergency stop switch and exhaust gas.

Keyless Start System Engine Start

Steps for starting the engine using the keyless start system.

Engine Starting and Warm-up

Emergency Start Procedure

Emergency Start Passcode Entry

Inspection and Maintenance Schedule

Maintenance Schedule Chart

A detailed schedule of maintenance tasks and intervals.

Maintenance Guidelines and Tool Kit

Engine Oil Change Procedure

Flushing the Water Passages

Submerged Motor Procedure

Storage Procedure

After Storage Procedures and Troubleshooting

Returning Motor to Operating Condition

Steps to take after removing the motor from storage.

Troubleshooting Common Issues

Guide to diagnose and resolve common motor complaints.

Fuse Identification and Troubleshooting

Suzuki DF115B Specifications

General IconGeneral
Gear Ratio2.59:1
Starting SystemElectric
SteeringRemote
Trim MethodPower Trim and Tilt
ExhaustThrough Prop Hub Exhaust
Max Output115 HP (86.0 kW)
Fuel SystemMulti-point sequential electronic fuel injection
Fuel Delivery SystemElectronic fuel injection
Shaft LengthL: 508mm (20 in.), X: 635mm (25 in.)
Alternator Output12V, 40A
Warranty3 years
Engine Type4-Stroke DOHC 16-Valve
Full Throttle RPM Range5000 - 6000 RPM

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