KTM 125 Duke User Manual (English)

Other manuals for KTM 125 Duke

Questions and Answers:

R
ritagarciaAug 23, 2025
What to do if my KTM Motorcycle engine has too little power?
- E
  Elizabeth KellyAug 23, 2025
  If your KTM Motorcycle engine has too little power, consider these potential causes: * The air filter is very dirty, so change the air filter. * The fuel filter is very dirty, so check the fuel pressure. * There's a fault in the fuel injection system, so read out the fault memory using the KTM diagnostics tool. * There is too little coolant in the cooling system, so check the cooling system for leakage and check the coolant level. * The radiator fins are very dirty, so clean the radiator fins. * There is foam formation in the cooling system, so drain the coolant and fill/bleed the cooling system. * The thermostat is defective, so check the thermostat.
V
Vanessa SalazarAug 31, 2025
Why does my KTM 125 Duke Motorcycle have high oil consumption?
- A
  Ariel MooreSep 1, 2025
  High oil consumption in your KTM Motorcycle could be due to several reasons. The engine vent hose might be bent, so route it without bends or replace it if necessary. The engine oil level might be too high, so check it. Also, using engine oil that is too thin (low viscosity) can cause high consumption, so change the engine oil and oil filter, and clean the oil screen.
V
Victoria HeathAug 30, 2025
What does it mean if the ABS warning lamp lights up on my KTM 125 Duke Motorcycle?
- T
  Thomas CainAug 31, 2025
  If the ABS warning lamp lights up on your KTM Motorcycle, it could indicate several issues. The ABS fuse might be blown, so replace the ABS fuses. It could also be due to a large difference in wheel speeds between the front and rear wheels, so stop the vehicle, switch off the ignition, and start it again. Finally, there might be a malfunction in the ABS.
J
Jennifer RodriguezAug 29, 2025
Why is my KTM 125 Duke battery discharged?
- X
  xmillsAug 30, 2025
  Your KTM Motorcycle battery could be discharged because the ignition wasn't switched off when the vehicle was parked, so recharge the battery. Alternatively, the alternator may not be charging the battery, so check the charging voltage and the open-circuit current.
C
Chelsea ChambersAug 28, 2025
What to do if my KTM 125 Duke engine dies during the trip?
- C
  Carla GrantAug 29, 2025
  If your KTM Motorcycle engine dies during a trip, it could be due to a lack of fuel, so refuel. Another possible cause is a blown fuse (1, 3, 4, or 8), so replace any blown fuses.
J
Janet MoraAug 28, 2025
Why does my KTM 125 Duke engine have so little power?
- S
  spearstamaraAug 28, 2025
  If your KTM Motorcycle engine has too little power, several factors could be responsible. The air filter might be very dirty, so replace it. The fuel filter could also be very dirty, so check the fuel pressure. Also, insufficient coolant in the cooling system can cause power loss, so check for leaks and verify the coolant level. Dirty radiator fins can also cause this issue, so clean them. Foam formation in the cooling system can be a problem, so drain and refill/bleed the system. Finally, a defective thermostat can cause power loss, so check it.
E
Edward JonesAug 27, 2025
What to do if my KTM Motorcycle engine does not crank?
- E
  Emily RileyAug 27, 2025
  If your KTM Motorcycle engine doesn't crank when you press the electric starter, there are several potential causes. It could be due to an operating error, so review the engine starting procedure. The battery might be discharged, requiring a recharge. A blown fuse (1, 3, 4, or 8) could also be the culprit, so replace any blown fuses. Finally, check the ground connection to ensure it's properly connected.
V
valentinerebeccaAug 27, 2025
What to do if my KTM 125 Duke Motorcycle engine turns but does not start?
- B
  brucewallaceAug 27, 2025
  If your KTM Motorcycle engine turns but does not start, it could be due to an operating error, so go through the steps of starting the engine. A defect in the fuel injection system could also be the problem, so read out the fault memory using the KTM diagnostics tool.
S
Stephanie OsborneAug 25, 2025
Why doesn't my KTM Motorcycle engine crank when pressing the electric starter button?
- B
  Brandon PowellAug 26, 2025
  If your KTM Motorcycle engine does not crank when you press the electric starter button, it could be due to several reasons. You may need to review the steps for starting the engine. The battery might be discharged, so recharging it could help. Check if fuse 1, 2, 3, or 4 is blown and change them if needed. Also, ensure that there is a proper ground connection.
R
Rachel YoderAug 25, 2025
Why does my KTM Motorcycle engine turn but does not start?
- T
  Thomas MyersAug 25, 2025
  If your KTM Motorcycle engine turns but does not start: * It may be an operating error, so go through the engine starting steps. * There may be a fault in the fuel injection system, so read out the fault memory using the KTM diagnostics tool.

KTM 125 Duke Specifications

General

Displacement	124.7 cc
Max Power	14.5 hp @ 9, 250 rpm
Max Torque	12 Nm @ 8, 000 rpm
Transmission	6-speed
Front Suspension	WP APEX 43
Rear Suspension	WP APEX Monoshock
Fuel Tank Capacity	13.4 liters
Seat Height	830 mm
Bore x Stroke	58 mm x 47.2 mm
Compression Ratio	12.8:1
Ground Clearance	175 mm
Wheelbase	1, 357 mm
Front Tyre	110/70 R17
Rear Tyre	150/60 R17
Fuel System	Electronic Fuel Injection (EFI)
Rear Brake	230 mm disc
Frame	Steel trellis frame, powder-coated
Engine Type	Single Cylinder, 4 Stroke, Liquid Cooled, DOHC

Summary

Safety Advice

General Safety Instructions

Provides general safety instructions and advice for operating the vehicle safely.

Risk Levels and Warnings

Details degrees of risk, symbols, and tampering warnings.

Safe Operation Practices

Outlines essential practices for safe vehicle operation, including avoiding impairment.

Controls

Handlebar Levers

Operation of clutch and hand brake levers.

Handlebar Light Controls

Handlebar Signal and Safety Switches

Ignition, Steering Lock, Starter

Operation of ignition, steering lock, and electric starter.

Instrument Cluster Overview

Explains the layout and components of the instrument cluster.

Instrument Activation and Test

Instrument Warning Messages

Details various warning indicators like low oil, low fuel, and high coolant.

Instrument Indicator Lamps

Preparing for Use

Advice on First Use

Provides essential advice for the initial use of the motorcycle, including safety and handling tips.

Running In the Engine

Guidelines for the engine running-in phase, including maximum engine speed.

Riding Instructions

Pre-Ride Checks and Maintenance

Lists essential checks and maintenance steps to perform before riding the motorcycle.

Starting the Engine

Details the procedure for starting the motorcycle's engine safely.

Shifting and Riding Techniques

Provides guidance on shifting gears, riding, and avoiding common hazards.

Applying the Brakes

Explains proper braking techniques, including considerations for ABS and road conditions.

Stopping and Parking Procedures

Refueling Instructions

Details the process of refueling the motorcycle safely and correctly.

Service Schedule

Required Maintenance Tasks

Lists mandatory maintenance tasks and their recommended intervals.

Recommended Maintenance Tasks

Tuning the Chassis

Adjusting Shock Absorber Spring Preload

Service Work on the Chassis

Chain Maintenance Procedures

Guides on checking, cleaning, and adjusting the drive chain tension.

Checking Chain and Sprocket Wear

Details how to check the drive chain, rear sprocket, and engine sprocket for wear.

Brake System

Antilock Braking System (ABS)

Explains the ABS unit, its function, and safety warnings related to ABS.

Checking Brake Discs

Checking Front Brake Fluid Level

Procedure for checking the front brake fluid level and related warnings.

Adding Front Brake Fluid

Detailed steps for adding front brake fluid and safety precautions.

Checking Front Brake Linings

Checking Rear Brake Fluid Level

Procedure for checking the rear brake fluid level and related warnings.

Checking Rear Brake Linings

Wheels and Tires

Removing the Front Wheel

Installing the Front Wheel

Removing the Rear Wheel

Installing the Rear Wheel

Checking Tire Condition

Guidelines for inspecting tires for cuts, tread depth, and age.

Checking Tire Air Pressure

Instructions for checking and setting correct tire air pressure for solo and passenger riding.

Electrical System

Removing the Battery

Installing the Battery

Recharging the Battery

Changing ABS Fuses (125 Duke)

Instructions for changing ABS fuses, including location and warnings.

Changing Fuses for Power Consumers

Checking the Headlight Setting

Cooling System

Checking Antifreeze and Coolant Level

Provides instructions for checking antifreeze protection and coolant levels.

Draining the Coolant

Filling and Bleeding the Cooling System

Tuning the Engine

Checking Throttle Cable Play

Checking Clutch Lever Play

Adjusting Clutch Cable Play

Service Work on the Engine

Checking the Engine Oil Level

Procedure for checking the engine oil level at operating temperature.

Changing Engine Oil and Filter

Detailed steps for changing the engine oil and oil filter.

Adding Engine Oil

Cleaning and Care

Cleaning the Motorcycle

Troubleshooting

Engine Starting and Running Issues

Common engine faults like not starting or low power, and their solutions.

Overheating and Warning Lamp Issues

Troubleshooting engine overheating and the engine diagnosis warning lamp.

ABS and High Oil Consumption Issues

Lighting and Display Malfunctions

Battery and Speedometer Issues

Related product manuals

125 EXC, EXC SIX DAYS, 200 XC, XC-W, EXC, 250 XC, XC-W, EXC, EXC SIX DAYS, 300 XC, XC-W, EXC-E, EXC-E SIX DAYS

KTM 125 Duke User Manual

Table of Contents