Suzuki DF115BG 2021 - User Manual

Questions and Answers

S
Shawn CampbellAug 17, 2025
What to do if my Suzuki DF115BG 2021 engine will not start (hard to start)?
- K
  kelliyoungAug 17, 2025
  If your Suzuki Outboard Motor engine won't start or is hard to start, consider the following: * Check if the fuel tank is empty. * Ensure the fuel isn't deteriorated. * Verify you're using the correct engine starting procedure. * Make sure the fuel tank air vent is open. * Confirm the fuel hose is properly connected and not kinked or pinched. * Inspect the fuel filter and tank filter for clogs. * Check the fuel pump. * See if the spark plug is fouled or the ignition system is faulty. * Check for loose electrical wiring.
E
Erica HernandezAug 20, 2025
Why won't my Suzuki DF115BG 2021 Outboard Motor starter motor operate?
- A
  ashleygregoryAug 20, 2025
  If the starter motor on your Suzuki Outboard Motor won't operate, check the following: * Ensure the emergency stop switch lock plate is correctly positioned. * Check if the starter relay fuse or sub battery cable fuse is blown. * Confirm the control handle is in NEUTRAL. * Inspect the battery terminal connection for corrosion or looseness. * Verify the battery has power. * The starter motor might have failed. * The engine switch or start/stop switch might have failed. * The ignition switch or start/stop switch might have failed. * Check for loose electric wiring connections.
A
April RogersAug 22, 2025
What to do if my Suzuki Outboard Motor engine speed will not increase?
- S
  Susan CooperAug 22, 2025
  If the engine speed of your Suzuki Outboard Motor won't increase, consider these potential causes: * Check if the propeller is damaged or not clean. * Ensure the propeller is properly selected. * Verify the outboard motor is correctly installed and the trim angle is properly adjusted. * See if the spark plug is fouled or incorrectly selected. * Check for a kinked or pinched fuel hose, or a clogged fuel filter. * The fuel might be deteriorated, or the fuel pump might have failed. * The ignition system or electronic throttle system might be faulty. * Too much cargo on the boat. * Water in the boat. * Bottom of boat is not clean or damaged.
M
Melissa BrownAug 26, 2025
What to do if my Suzuki Outboard Motor engine idles unstably or stalls?
- P
  powellwilliamAug 26, 2025
  If your Suzuki Outboard Motor engine idles unstably or stalls, here are some things to check: * See if the spark plug is fouled. * Check for a kinked or pinched fuel hose, or a fuel hose that's not properly connected to the engine. * Make sure the fuel isn't deteriorated and the fuel filter isn't clogged. * The fuel pump might have failed. * The ignition system may be faulty. * Ensure you're using the correct engine oil. * The thermostat might have failed. * Check for loose electrical wiring connections.
G
George ClarkAug 28, 2025
What does it mean if the caution system is activated on my Suzuki DF115BG 2021 Outboard Motor?
- P
  pattersonmichaelAug 28, 2025
  If the caution system is activated on your Suzuki Outboard Motor (caution buzzer sounds, caution LEDs light), it could indicate several issues: * The cooling water passage may be clogged. * The thermostat or water pump might have failed. * The oil change reminder system may be activated. * The engine oil level might be low or the oil deteriorated, or the engine oil filter could be clogged. * The oil pump might have failed. * The propeller might be damaged. * Battery power could be lost. * The engine control sensor might be faulty. * Check for loose electrical wiring connections.
C
Caroline DixonAug 31, 2025
What to do if my Suzuki DF115BG 2021 Outboard Motor Keyless Start System does not turn ON even when the engine switch is operated and the error sound (three short buzzer beeps) is NOT heard?
- G
  george07Aug 31, 2025
  If the Keyless Start System on your Suzuki Outboard Motor doesn't turn ON when the engine switch is operated, and you don't hear the error sound (three short buzzer beeps), check the following: * Ensure the emergency stop switch lock plate is in position. * Inspect the battery terminal connection for corrosion or looseness. * Verify the battery has power. * Keyless control unit failure. * Check for loose electric wiring connections. * Engine switch panel failure.
B
Brenda SchneiderSep 3, 2025
What to do if my Suzuki DF115BG 2021 Outboard Motor Keyless Start System does not turn OFF even when the engine switch is operated?
- L
  Lynn BlackSep 3, 2025
  If the Keyless Start System on your Suzuki Outboard Motor doesn't turn OFF when the engine switch is operated, check for loose electrical wiring connections and Engine switch panel failure.
C
cheryldennisSep 5, 2025
What to do if my Suzuki DF115BG 2021 Outboard Motor Keyless Start System does not turn ON even when the engine switch is operated and the error sound (three short buzzer beeps) IS heard?
- V
  Vincent FinleySep 5, 2025
  If the Keyless Start System on your Suzuki Outboard Motor doesn't turn ON when the engine switch is operated, and you DO hear the error sound (three short buzzer beeps), consider these potential causes: * The keyless fob may be outside the operating range, have a dead battery, or be in OFF mode. * The keyless fob may not be authenticated. * There may be a communication failure due to strong radio waves or noise. * There may be an electrical wiring connection failure between the keyless control unit and the outboard motor. * There may be an authentication error between the keyless control unit and the outboard motor. * There may be an abnormality in the electronic control system of the engine.
C
colleenedwardsSep 8, 2025
Why is my Suzuki DF115BG 2021 Outboard Motor engine vibrating excessively?
- C
  Cynthia SmithSep 8, 2025
  If your Suzuki Outboard Motor engine is vibrating excessively, check if the propeller is damaged or if the engine mounting bolts or clamp screws are loose.
W
wrightchristopherSep 12, 2025
What could cause the propeller of my Suzuki DF115BG 2021 not to rotate?
- J
  James HoffmanSep 12, 2025
  If the propeller of your Suzuki Outboard Motor is not rotating, it could be due to a worn or damaged propeller bush, a damaged drive shaft, or a damaged propeller shaft.

Summary

Important Information and Notices

Important Notice to Owners

Crucial safety and operational guidance for owners regarding outboard motor use.

Foreword

Identification Number Location

Fuel and Oil

Gasoline Guidelines

Guidelines for using unleaded and ethanol-blended gasoline with the outboard motor.

Engine Oil Recommendations

Gear Oil Specifications

Recommendations for gear oil type and viscosity grades for the outboard motor.

Location of Safety Labels

Safety Label Symbol Meanings

Explanation of symbols found on outboard motor and fuel tank labels for safety.

Location of Parts

Motor Mounting

Battery Installation

Battery Requirements

Specifications for suitable starting batteries for outboard motors.

Sub Battery Cable

Use of Electrical Accessories

Suzuki Keyless Start System

Keyless Fob Information

Information about the keyless fob, its function, and associated warnings.

Immobilizer System

Explanation of the immobilizer system's function with the keyless fob.

Switching Keyless Fob Communication Mode

Keyless Fob Battery Replacement

Propeller Selection and Installation

Propeller Selection Guidance

Guidance on choosing the correct propeller for optimal boat performance.

Propeller Installation Procedure

Step-by-step instructions for safely installing a boat propeller.

Adjustment Procedures

Trim Angle Adjustment

How to adjust trim angle for steering stability and performance.

Automatic Trim Angle Adjustment

Explanation of the automatic trim angle adjustment function.

Trim Tab Adjustment

Adjusting trim tabs to compensate for boat veering tendencies.

Control Handle Adjustment

Adjusting control handle friction and detent force for operator preference.

Idle Speed Adjustment

Information on factory-set idle speed adjustment.

Setting Tilt Upper Limit Position

Canceling Tilt Upper Limit Setting

Procedure to cancel the current tilt upper limit setting.

Setting Tilt Upper Limit

Steps to reset and set the tilt upper limit position for the motor.

Motor Cover Fastening Adjustment

Multi-Function Gauge Operation

Gauge Button Functions

Overview of the multi-function gauge buttons and their operations.

Screen Selection

How to select different display screens on the multi-function gauge.

Sub Information Selection

Guide to selecting and displaying sub-information on the gauge.

Menu Information Selection

Navigating the menu for settings like illumination, diagnosis, and display.

Alarm and Caution Systems

Caution System Overview

Alerts for conditions that may damage the outboard motor.

Over-Revolution Caution System

Warning for exceeding the engine's maximum recommended speed.

Oil Pressure Caution System

Alert for low engine lubricating oil pressure.

Overheat Caution System

Warning for high cylinder wall temperature due to insufficient cooling.

Check Thermostat Alert System

Alert for thermostat failure or improper engine temperature rise.

Battery Voltage Caution System

Warning for low battery voltage affecting motor performance.

Electronic Control Systems Caution

Control Unit Communication Caution

Error alert for the electronic throttle and shift control system.

2 nd Station Caution System

Alert for errors in the 2nd station control system.

Throttle System Caution

Warning for errors in the electronic throttle control system.

Shift Control Caution System

Alert for errors in the electronic shift control system.

Gauge Communication Caution

Alert for communication errors within the gauge system.

Station Setting Troll Mode Caution

Warning when TROLL mode operation is unavailable or starts incorrectly.

Keyless Start System Cautions

Keyless Fob Caution System

Alert for keyless fob identification errors or system malfunctions.

Keyless Fob Battery Caution

Warning for low keyless fob battery voltage impacting performance.

Keyless Control Unit Caution

Alert for low battery voltage affecting the keyless control unit.

Diagnostic System

Oil Change Reminder System

Engine Stalling Caution System

Water in Fuel Alert System

Operation of Tilting Systems

Power Trim and Tilt Operation

Operating the power trim and tilt switch for motor angle adjustment.

Manual Tilting Procedure

Manually tilting the motor when power trim is unavailable.

Tilt Lock Lever Usage

Using the tilt lock lever to secure the motor in a tilted position.

Inspection Before Boating

Break-In Procedures

Break-in Period and Procedure

Guidelines for the initial engine break-in period to ensure longevity.

Operation

Engine Switch Operation

Using the engine switch for starting and stopping engines.

Ignition Switch Operation

Using the ignition key for starting and stopping engines.

Control Panel Overview

Overview of control panel functions for multiple engine configurations.

Remote Control Box Functions

Details on remote control box types and their switches.

Pre-Start Engine Checks

Pre-start checks and procedures for the outboard motor.

Starting the Engine

Step-by-step guide to starting the outboard motor.

Shifting and Speed Control

Procedures for shifting gears and controlling boat speed.

Stopping the Engine

Instructions for safely stopping the outboard motor.

Motor Removal and Transporting

Motor Removal Procedure

Recommended procedure for removing the outboard motor from a boat.

Motor Transporting Guidelines

Guidelines for safely transporting the outboard motor vertically or horizontally.

Trailering Precautions

Inspection and Maintenance

Maintenance Schedule

Schedule for regular inspections and maintenance tasks based on hours or months.

Spark Plug Service

Procedures for removing, inspecting, and installing spark plugs.

Breather and Fuel Line Inspection

Inspecting breather and fuel lines for leaks or damage.

Engine Oil Service

Engine Oil Change Procedure

Step-by-step guide for changing the engine oil.

Gear Oil Service

Anodes and Bonding Wires

Anode Inspection and Maintenance

Inspection and maintenance of anodes for corrosion protection.

Bonding Wire Checks

Checking bonding wires for electrical connections and damage.

Battery Maintenance

Engine Oil Filter Replacement

Flushing Water Passages

Flushing with Engine Running

Flushing water passages with engine running in vertical position.

Flushing with Engine Not Running

Flushing water passages with engine not running in vertical or tilt-up.

Submerged Motor Procedure

Storage Procedure

Motor Storage Guidelines

Procedures for preparing the motor for long-term storage.

Battery Storage Instructions

Guidelines for storing the battery during extended periods of non-use.

After Storage Procedures

Troubleshooting Common Issues

Fuse Information

Specifications

EC Directive Information

Sound Pressure Level

Information on sound pressure level regulations and limits for European countries.

Flowchart of Oil Change Reminder System

Suzuki DF115BG 2021 Specifications

General

Starting System	Electric
Cooling System	Water Cooled
Steering System	Remote
Full Throttle Operating Range	5000-6000 RPM
Engine Mounting	Shear Mount
Trim Method	Power Trim and Tilt
Displacement	2044 cm3 (124.7 cu.in.)
Maximum Output	115 HP
Oil Pan Capacity	5.5 L (5.8 US qt)
Ignition System	Fully transistorized
Alternator Output	12V 40A
Shaft Length	20 in (508 mm)
Engine Type	4-Stroke DOHC 16-Valve
Fuel System	Multi-point sequential electronic fuel injection
Exhaust	Through Prop Hub Exhaust
Fuel Tank	Remote Fuel Tank