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KTM 125 SX 2024 User Manual

KTM 125 SX 2024
153 pages
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OWNER'S MANUAL 2024
125 SX
125 XC
Art. no. 3214832en

Table of Contents

Other manuals for KTM 125 SX 2024

Questions and Answers:

KTM 125 SX 2024 Specifications

General IconGeneral
Displacement124.8 cm³
Bore x Stroke54 mm x 54.5 mm
StarterElectric starter
Transmission6-speed
Front SuspensionWP XACT-USD, Ø 48 mm
Rear SuspensionWP XACT Monoshock with linkage
Ground Clearance375 mm
Seat Height950 mm
Front Tire80/100-21"
Rear Tire100/90-19"
Engine TypeSingle-cylinder, 2-stroke
Fuel SystemMikuni TMX 38
Front BrakeDisc brake, 260 mm
Rear BrakeDisc brake, 220 mm
ClutchWet, multi-disc clutch, Brembo hydraulics
FrameCentral double-cradle type in chrome-molybdenum steel

Summary

Welcome Message

Means of Representation

Symbols Used

Defines the meaning of various symbols used to convey information and warnings.

Formats Used

Explains the typographical formats like proprietary names and underlined terms.

Safety Advice

General Safety and Risk Information

Covers intended use, misuse, general safety advice, and risk degree symbols.

Safe Operation and Rider Protection

Guidelines for safe operation, including warnings and the importance of protective clothing.

Operational Guidelines and Manual Reference

Covers work rules, environmental responsibility, and the importance of the owner's manual.

Important Notes

Warranty, Fluids, and Parts

Covers warranty conditions, fuel/fluid usage, and recommendations for spare parts.

Service, Figures, and Customer Support

Information on service importance, figure notes, and customer service contacts.

View of Vehicle

Front Left Vehicle View

Diagram identifying key components from the front left view of the motorcycle.

Rear Right Vehicle View

Diagram identifying key components from the rear right view of the motorcycle.

Serial Numbers

Vehicle and Component Identification

Details the locations of VIN, engine number, and part numbers for identification.

Vehicle Controls

Handlebar and Engine Controls

Describes operation of clutch, brake, throttle, stop/start buttons, and combination switch.

Indicator Lights

Explains the function of indicator lamps for malfunction, mapping, and fuel level.

Instruments and Fuel Cap

Covers the combination instrument and procedure for opening the fuel tank filler cap.

Preparing for Use

First Use and Engine Break-in

Essential advice for the first ride and the critical engine running-in phase.

Operating Conditions and Battery Performance

Covers battery behavior in cold and preparing for difficult riding conditions like sand or mud.

Riding Instructions

Pre-Ride Checks and Starting

Covers essential pre-ride checks, starting procedures, and safe starting off.

Riding, Braking, and Parking

Guides on shifting, riding techniques, braking, and proper stopping/parking procedures.

Transport and Refueling

Instructions for safely transporting the motorcycle and the refueling process.

Service Schedule

Additional Service Information

Provides context on service work, intervals, and where to find the latest schedule.

Detailed Service Schedule

Table detailing maintenance tasks and their recommended intervals (hours/months).

Chassis Tuning

Suspension Adjustment and Measurement

Covers chassis settings, shock absorber adjustments (compression, rebound, preload), and sag measurements.

Fork Suspension Settings

Details XACT air suspension and basic fork setting checks and adjustments.

Fork Adjustment Procedures

Step-by-step guides for adjusting fork air pressure, compression, and rebound damping.

Handlebar Position

Information on handlebar mounting options and adjusting its position for comfort and safety.

Chassis Service Work

Lift Stand Procedures

Instructions for safely raising and removing the motorcycle using a lift stand.

Front Fork and Steering System Service

Covers fork bleeding, protector installation, leg service, and steering head bearing adjustments.

Rear Suspension and Bodywork Service

Procedures for shock absorber, seat, frame protector, and fender service.

Air Filter, Fuel Tank, and Exhaust System Service

Covers air filter maintenance, fuel tank removal/installation, and silencer service.

Chain and Drivetrain Maintenance

Procedures for chain inspection, cleaning, tensioning, and checking drivetrain components.

Frame, Throttle Cable, and Grip Checks

Checks for frame integrity, throttle cable routing, and rubber grip condition.

Clutch and Lever Adjustments

Covers clutch lever position adjustment and hydraulic clutch fluid service.

Brake System

Hand Brake Lever and Disc Checks

Covers checking hand brake lever free travel, position, and brake disc condition.

Front Brake Fluid and Lining Service

Procedure for checking/adding front brake fluid and changing front brake linings.

Foot Brake Lever and Rear Brake Checks

Covers foot brake lever free travel, position, and rear brake fluid/lining checks.

Rear Brake Lining Change

Procedure for changing rear brake linings, with warnings on servicing and approved parts.

Wheels and Tires

Front Wheel Service

Detailed procedures for removing and installing the front wheel.

Rear Wheel Service

Detailed procedures for removing and installing the rear wheel.

Tire Condition and Pressure Checks

How to check tire condition, wear, age, and pressure for safety and performance.

Spoke Tension Check

Procedure for checking spoke tension by sound and importance of correct tension.

Cooling System

Cooling System Overview

Explains the function of the water pump and radiator cap in coolant circulation.

Antifreeze and Coolant Level Checks

Procedure for checking coolant antifreeze protection and level in the radiator.

Coolant Draining and Refilling

Instructions for draining the coolant and refilling the system.

Coolant Changing Procedure

Procedure for changing the coolant, including draining, refilling, and bleeding.

Electrical System

12-V Battery Maintenance

Instructions for removing, installing, and charging the 12-V battery.

Fuse Replacement Procedures

Covers changing the main fuse and the fuel pump fuse for electrical system protection.

Diagnostics Connector Location

Location of the diagnostics connector and its use with diagnostic tools.

Exhaust Control System

Programming Exhaust Control End Positions

Steps to reprogram the exhaust control end positions after work on the system.

Engine Tuning

Changing Engine Mapping

How to change engine mapping (Lean/Rich) using the combination switch for different surfaces.

Throttle Cable Play Adjustment

Procedure for checking and adjusting throttle cable play for smooth operation.

Idle Speed Adjustment

How to adjust the engine idle speed using the idle speed adjusting screw.

Shift Lever Position Check/Adjustment

Covers checking and adjusting the shift lever's basic position for ergonomics.

Engine Service Work

Fuel Screen Replacement

Procedure for changing the fuel screen, with safety warnings and steps for disconnection.

Gear Oil Level Check and Change

Covers checking the gear oil level and the procedure for changing the gear oil.

Adding Gear Oil

Instructions for adding gear oil when the engine is cold, and warnings about premature wear.

Cleaning and Care

Motorcycle Cleaning Procedures

Detailed instructions on how to clean the motorcycle, avoiding damage from high pressure and chemicals.

Motorcycle Storage

Long-Term Storage Preparation

Steps for preparing the motorcycle for extended storage, including fuel, battery, and cleaning.

Preparation for Use After Storage

Instructions for recommissioning the motorcycle after a period of storage.

Troubleshooting Guide

Engine Starting Issues

Troubleshooting for issues where the engine does not start or turn over.

Engine Performance Problems

Troubleshooting for issues like lack of power, not speeding up, or dying during trips.

Engine Overheating and Emissions

Troubleshooting for engine overheating, smoke emissions, and oil leaks.

Indicator Lamp and System Faults

Troubleshooting for malfunction indicator lamp warnings and system faults.

Blink Code Diagnostics

Malfunction Indicator Lamp Codes

Details blink codes related to various sensors and system faults, indicating error conditions.

Technical Specifications

Engine Specifications

Detailed specifications for the engine, including design, displacement, bore, stroke, and transmission.

Engine Tightening Torques

List of specified tightening torques for various engine screws and nuts.

Fluid Capacities

Specifies the capacities for engine oil, coolant, and fuel tank.

Chassis Specifications

Technical details for the chassis, including frame, fork, shock absorber, and brake system.

Electrical System Specifications

Specifications for the 12-V battery and fuses.

Tire Specifications

Details the front and rear tire specifications and validity for SX and XC models.

Fork Specifications

Technical data for the SX and XC forks, including damping and length.

Shock Absorber Specifications

Technical data for the SX and XC shock absorbers, including damping and spring preload.

Chassis Tightening Torques

List of specified tightening torques for various chassis screws and nuts.

Substances and Fluids

Brake Fluid Specifications

Details the standard, guidelines, and recommended suppliers for brake fluid.

Coolant Specifications

Information on coolant type, antifreeze protection, and recommended suppliers.

Engine Oil (15W/50) Specifications

Details the standard, guidelines, and recommended suppliers for 15W/50 engine oil.

2-Stroke Engine Oil Specifications

Guidelines for using high-grade 2-stroke engine oil for racing applications.

Auxiliary Substances and Lubricants

Air Filter Cleaner

Recommended air filter cleaner: MOTOREX® Racing Bio Dirt Remover.

Chain Cleaner

Recommended chain cleaner: MOTOREX® Chain Clean.

Fuel Additive

Recommended fuel additive: MOTOREX® Fuel Stabilizer.

Greases and Sprays

Recommended greases, motorcycle cleaner, and chain spray for maintenance.

Standards and Classifications

JASO T903 MA2 Standard

Explains the JASO T903 MA2 standard for motorcycle engine oils.

SAE Viscosity Classification

Defines SAE viscosity classes for oils based on viscosity, not quality.

JASO FD Classification

Explains the JASO FD classification for 2-stroke racing engine oils.

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