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KTM 125 SX 2021 User Manual

KTM 125 SX 2021
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12 BRAKE SYSTEM
88
Warning
Skin irritationBrake fluid causes skin irritation.
Keep brake fluid out of the reach of children.
Wear suitable protective clothing and safety glasses.
Do not allow brake fluid to come into contact with the skin, the eyes or clothing.
Consult a doctor immediately if brake fluid has been swallowed.
Rinse the affected area with plenty of water in the event of contact with the skin.
Rinse eyes thoroughly with water immediately and consult a doctor if brake fluid comes into contact
with the eyes.
If brake fluid spills on to your clothing, change the clothing.
Warning
Danger of accidentsOld brake fluid reduces the braking effect.
Make sure that brake fluid for the front and rear brake is changed in accordance with the service
schedule. (Your authorized KTM workshop will be glad to help.)
Note
Environmental hazardHazardous substances cause environmental damage.
Dispose of oils, grease, filters, fuel, cleaning agents, brake fluid, etc., correctly and in compliance with
the applicable regulations.
Info
Never use DOT 5 brake fluid. It is silicone-based and purple in color. Oil seals and brake lines are not
designed for DOT 5 brake fluid.
Avoid contact between brake fluid and painted parts. Brake fluid attacks paint.
Only use clean brake fluid from a sealed container.
Preparatory work
Check the brake linings of the rear brake. ( p. 89)
K01185-10
Main work
Stand the vehicle upright.
Remove screw cap
1
with membrane
2
and the O-ring.
Add brake fluid to level
A
.
Brake fluid DOT 4 / DOT 5.1 ( p. 141)
Mount the screw cap with the membrane and the O-ring.
Info
Clean up overflowed or spilled brake fluid immediately
with water.

Table of Contents

Other manuals for KTM 125 SX 2021

Questions and Answers:

KTM 125 SX 2021 Specifications

General IconGeneral
Engine Type1-cylinder, 2-stroke engine
Displacement124.8 cm³
Bore x Stroke54 mm x 54.5 mm
StarterKickstarter
Transmission6-speed
Front SuspensionWP XACT-USD, Ø 48 mm
Rear SuspensionWP XACT Monoshock with linkage
CoolingLiquid cooled
Front Tire80/100-21"
Rear Tire100/90-19"
Seat Height950 mm
Ground Clearance375 mm
FrameCentral tube frame made of chrome molybdenum steel
Front BrakeDisc brake
Rear BrakeDisc brake
Fuel Tank Capacity7.5 liters
Fuel SystemMikuni TMX carburetor

Summary

Safety Advice

Use Definition - Intended Use

Defines the intended use of the vehicle and compliance with motorsports regulations.

Degrees of Risk and Symbols

Explains the risk levels (Danger, Warning, Caution, Note) and associated symbols.

Safe Operation

Provides safety instructions regarding rider fitness and exhaust gas toxicity.

Controls

Preparing for Use

Advice on Preparing for First Use

Provides essential advice on rider fitness, protective clothing, and initial vehicle checks.

Running in the Engine

Details the engine running-in procedure, specifying performance limits and throttle use.

Preparing the Vehicle for Difficult Operating Conditions

Covers preparations for challenging conditions like sand, mud, high/low temperatures.

Riding Instructions

Checks and Maintenance Measures When Preparing for Use

Lists essential pre-ride checks covering fluids, brakes, tires, and controls.

Starting

Provides instructions and safety warnings for starting the engine.

Starting Off

Explains how to start moving from a standstill, including clutch and throttle control.

Shifting, Riding

Guides on gear shifting, riding techniques, throttle control, and engine braking.

Applying the Brakes

Details proper braking techniques, warnings about brake system issues, and surface conditions.

Stopping, Parking

Provides instructions and safety warnings for stopping and parking the motorcycle.

Refueling

Details safe refueling procedures, fuel specifications, and hazard warnings.

Service Schedule

Required Work

Lists mandatory maintenance tasks and their required intervals (operating hours, races).

Recommended Work

Lists recommended maintenance tasks and their required intervals (operating hours, months).

Tuning the Chassis

Checking the Basic Chassis Setting with Rider's Weight

Explains how rider weight affects chassis setting and the need for suspension adjustment.

Compression Damping of the Shock Absorber

Explains high-speed and low-speed compression damping and their adjustment.

Adjusting the Low-Speed Compression Damping of the Shock Absorber

Provides step-by-step instructions for adjusting low-speed compression damping.

Adjusting the High-Speed Compression Damping of the Shock Absorber

Details the procedure for adjusting high-speed compression damping on the shock absorber.

Adjusting the Rebound Damping of the Shock Absorber

Guides on how to adjust the rebound damping of the rear shock absorber.

Checking the Static Sag of the Shock Absorber

Details how to check the static sag of the rear shock absorber and its adjustment.

Checking the Riding Sag of the Shock Absorber

Provides steps for checking the riding sag of the rear shock absorber and its adjustment.

Adjusting the Spring Preload of the Shock Absorber

Describes how to adjust the spring preload on the rear shock absorber for proper sag.

Adjusting the Riding Sag

Guides on how to adjust the riding sag by selecting and mounting a suitable spring.

Adjusting the Fork Air Pressure

Details the procedure for adjusting the air pressure in the front fork for optimal performance.

Adjusting the Compression Damping of the Fork

Explains how to adjust the compression damping on the front fork for desired handling.

Adjusting the Rebound Damping of the Fork

Provides instructions for adjusting the rebound damping on the front fork.

Service Work on the Chassis

Checking Steering Head Bearing Play

Explains how to check for play in the steering head bearing and potential damage.

Adjusting Steering Head Bearing Play

Details the procedure for adjusting steering head bearing play to eliminate looseness or detent.

Removing the Shock Absorber

Step-by-step guide to removing the rear shock absorber, including related components.

Installing the Shock Absorber

Provides instructions for installing the rear shock absorber and tightening specifications.

Cleaning the Air Filter and Air Filter Box

Guides on cleaning the air filter and air filter box, including proper drying and oiling.

Removing the Fuel Tank

Provides step-by-step instructions for removing the fuel tank, including safety warnings.

Installing the Fuel Tank

Guides on installing the fuel tank, including fitting spoilers and connecting hoses.

Checking the Chain Tension

Details how to check chain tension and the consequences of incorrect tension.

Adjusting the Chain Tension

Provides step-by-step instructions for adjusting the chain tension and wheel alignment.

Checking the Chain, Rear Sprocket, Engine Sprocket, and Chain Guide

Guides on checking wear of chain, sprockets, and chain guide, and when to replace them.

Checking/Correcting the Fluid Level of the Hydraulic Clutch

Explains how to check and correct the hydraulic clutch fluid level.

Changing the Hydraulic Clutch Fluid

Provides instructions and safety information for changing the hydraulic clutch fluid.

Brake System

Checking the Free Travel of the Hand Brake Lever

Details how to check the free travel of the hand brake lever and adjust it.

Checking the Brake Discs

Explains how to check brake disc thickness, damage, and deformation.

Checking the Front Brake Fluid Level

Details how to check the front brake fluid level and add fluid if necessary.

Adding Front Brake Fluid

Provides instructions and safety information for adding front brake fluid.

Checking the Front Brake Linings

Guides on checking front brake lining thickness, damage, and cracking.

Changing the Front Brake Linings

Provides instructions and warnings for changing the front brake linings.

Checking the Free Travel of Foot Brake Lever

Details how to check the free travel of the foot brake lever and adjust it.

Checking the Rear Brake Fluid Level

Details how to check the rear brake fluid level and add fluid if necessary.

Adding Rear Brake Fluid

Provides instructions and safety information for adding rear brake fluid.

Checking the Brake Linings of the Rear Brake

Guides on checking rear brake lining thickness, damage, and cracking.

Changing the Rear Brake Linings

Provides instructions and warnings for changing the rear brake linings.

Wheels, Tires

Removing the Front Wheel

Step-by-step guide to safely removing the front wheel.

Installing the Front Wheel

Provides instructions for correctly installing the front wheel and tightening specifications.

Removing the Rear Wheel

Details the procedure for safely removing the rear wheel.

Installing the Rear Wheel

Guides on correctly installing the rear wheel, chain, and tightening specifications.

Checking Tire Pressure

Details how to check and correct tire pressure for optimal performance and safety.

Electrical System

Charging the 12-V Battery (125 XC US)

Details the importance of proper charging for battery life and procedures.

Cooling System

Checking the Antifreeze and Coolant Level

Details safety warnings and procedures for checking antifreeze and coolant levels.

Tuning the Engine

Carburetor - Adjusting the Idle Speed

Details the procedure for adjusting idle speed and idle mixture for optimal starting and idling.

Service Work on the Engine

Storage

Troubleshooting

Technical Data

Carburetor

Details carburetor types, settings, and tuning charts for different models and conditions.

Substances

Auxiliary Substances

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