KTM 125 EXC 2016 User Manual (English)

Matthew PenaJul 29, 2025

Why does my KTM 125 EXC 2016 engine overheat?

K
Kathleen SmithJul 29, 2025
Your KTM Motorcycle engine may overheat due to several reasons. It could be due to too little coolant in the cooling system, which means you should check the cooling system for leakage and the coolant level. Insufficient airflow can also cause overheating, so switch off the engine when stationary. Very dirty radiator fins, foam formation in the cooling system (in this case, drain and refill the coolant), a damaged cylinder head or cylinder head gasket (check them), a bent radiator hose (replace it), or an incorrect ignition point due to a loose stator (adjust the ignition on all 125 models) can also be the cause.

ronaldstewartAug 4, 2025

How to fix KTM 125 EXC 2016 engine stalling or popping into the carburetor?

H
hector69Aug 4, 2025
If your KTM Motorcycle engine stalls or pops into the carburetor, it might be taking in bad air. In this case, check the intake flange and carburetor for tightness. Also, the connector or ignition coil may be loose or oxidized; if so, clean the connector and treat it with contact spray.

James WyattAug 10, 2025

What to do if my KTM Motorcycle emits white smoke?

P
petermaxwellAug 10, 2025
If you observe white smoke emission (steam in exhaust gas) from your KTM Motorcycle, it could be due to a damaged cylinder head or cylinder head gasket. Inspect the cylinder head and cylinder head gasket.

alexander62Aug 16, 2025

Why is gear oil coming out of the vent hose on my KTM Motorcycle?

O
owelchAug 16, 2025
If gear oil exits at the vent hose of your KTM Motorcycle, it's likely because too much gear oil was added. Check the gear oil level.

Christopher HayesAug 22, 2025

How to troubleshoot water in the gear oil of my KTM Motorcycle?

C
chapmanjenniferAug 22, 2025
If there's water in the gear oil of your KTM Motorcycle, a damaged shaft seal ring or water pump could be the cause. Check the shaft seal ring and water pump.

KTM 125 EXC 2016 Specifications

General

Displacement	124.8 cc
Bore x Stroke	54 mm x 54.5 mm
Starter	Kick starter
Transmission	6-speed
Rear Suspension	WP monoshock
Front Brake	Disc brake
Rear Brake	Disc brake
Fuel System	Carburetor
Ignition	Kokusan
Final Drive	Chain
Seat Height	960 mm
Engine Type	Single cylinder, 2-stroke
Front Suspension	WP-USD, Ø 48 mm
Fuel Capacity	9.5 l
Frame Type	Chromium-Molybdenum steel

KTM 125 EXC 2016 User Manual

Table of Contents

Questions and Answers:

KTM 125 EXC 2016 Specifications

Summary

2 Safety Advice

2.2 Safety Instructions

2.3 Risk Degrees and Symbols

2 Safety Advice Continued

2.5 Safe Operation

2.6 Protective Clothing

3 Important Notes

3.4 Service Importance

6 Controls

6.4 Kill Switch Operation (EXC Models)

8 Preparing for Use

8.1 First Use Advice

8 Preparing for Use Continued

8.2 Engine Running-In Procedure

9 Riding Instructions

9.1 Pre-Ride Checks and Maintenance

9.2 Starting the Engine

9 Riding Instructions Continued

9.3 Starting Off Procedure

9.4 Shifting and Riding Techniques

9.5 Braking Techniques

9.8 Refueling Safely

10 Service Schedule

10.1 Regular Maintenance Schedule

11 Tuning the Chassis

11.1 Basic Chassis Setting with Rider Weight

11.2 Shock Absorber Compression Damping

11.3 Low-Speed Compression Damping Adjustment

11 Tuning the Chassis Continued

11.4 High-Speed Compression Damping Adjustment

11.6 Unloaded Rear Wheel Sag Measurement

11.8 Riding Sag Check

11.10 Adjusting Riding Sag

11.12 Fork Compression Damping Adjustment

11.13 Fork Rebound Damping Adjustment

11.14 Fork Spring Preload Adjustment

11.5 Rebound Damping Adjustment

11.7 Static Sag Check

11.9 Adjusting Spring Preload

11.11 Basic Fork Setting Check

12 Service Work on the Chassis

12.3 Bleeding Fork Legs

12 Service Work on the Chassis Continued

12.8 Installing Fork Legs

12.9 Removing Lower Triple Clamp

12.10 Removing Lower Triple Clamp

12.12 Installing Lower Triple Clamp

12.13 Checking Steering Head Bearing Play

12.14 Adjusting Steering Head Bearing Play

12.19 Installing Shock Absorber

12.25 Installing the Air Filter

12.31 Removing the Fuel Tank

12.32 Installing the Fuel Tank

12.35 Checking Chain Tension

12.37 Drivetrain Component Check

12.38 Frame Check Procedure

12.39 Swingarm Check Procedure

12.44 Hydraulic Clutch Fluid Level Check

12.7 Removing Fork Legs

12.11 Installing Lower Triple Clamp

12.18 Removing Shock Absorber

12.36 Adjusting Chain Tension

12.45 Changing Hydraulic Clutch Fluid

12.24 Removing the Air Filter

13 Brake System

13.1 Hand Brake Lever Free Travel Check

13.2 Adjusting Hand Brake Lever Free Travel

13.3 Adjusting Hand Brake Lever Position

13 Brake System Continued

13.4 Checking Brake Discs

13.7 Checking Front Brake Linings

13.8 Changing Front Brake Linings

13.9 Checking Foot Brake Lever Free Travel

13.10 Adjusting Foot Brake Lever Position

13.11 Checking Rear Brake Fluid Level