Contents

1 MEANS OF REPRESENTATION
- 1.1 Symbols used
- 1.2 Formats used
2 SAFETY ADVICE
- 2.1 Use definition intended use
- 2.2 Misuse
- 2.3 Safety advice
- 2.4 Degrees of risk and symbols
- 2.5 Tampering warning
- 2.6 Safe operation
- 2.7 Protective clothing
- 2.8 Work rules
- 2.9 Environment
- 2.10 Owner's Manual
3 IMPORTANT NOTES
- 3.1 Manufacturer and implied warranty
- 3.2 Operating and auxiliary substances
- 3.3 Spare parts, accessories
- 3.4 Service
- 3.5 Figures
- 3.6 Customer service
4 VIEW OF VEHICLE
- 4.1 View of vehicle, front left (example)
- 4.2 View of vehicle, rear right (example)
5 SERIAL NUMBERS
- 5.1 Chassis number
- 5.2 Type label
- 5.3 Engine number
- 5.4 Fork part number
- 5.5 Shock absorber article number
6 CONTROLS
- 6.1 Clutch lever
- 6.2 Hand brake lever
- 6.3 Throttle grip
- 6.4 Kill switch
- 6.5 Opening the filler cap
- 6.6 Closing the filler cap
- 6.7 Fuel tap
- 6.8 Choke
- 6.9 Shift lever
- 6.10 Kick starter
- 6.11 Foot brake lever
- 6.12 Plug-in stand
- 6.13 Service hour counter
7 PREPARING FOR USE
- 7.1 Advice on first use
- 7.2 Running in the engine
- 7.3 Preparing the vehicle for difficult riding conditions
- 7.4 Preparing for rides on dry sand
- 7.5 Preparing for rides on wet sand
- 7.6 Preparing for rides on wet and muddy surfaces
- 7.7 Preparations for riding at high temperatures and low speeds
- 7.8 Preparing for rides at low temperature or in snow
8 RIDING INSTRUCTIONS
- 8.1 Checks and maintenance measures when preparing for use
- 8.2 Starting
- 8.3 Starting off
- 8.4 Shifting, riding
- 8.5 Applying the brakes
- 8.6 Stopping, parking
- 8.7 Transport
- 8.8 Refueling
9 SERVICE SCHEDULE
- 9.1 Additional information
- 9.2 Required work
- 9.3 Recommended work
10 TUNING THE CHASSIS
- 10.1 Checking the basic chassis setting with the rider's weight
- 10.2 Air suspension AER 48
- 10.3 Compression damping of the shock absorber
- 10.4 Adjusting the low-speed compression damping of the shock absorber
- 10.5 Adjusting the high-speed compression damping of the shock absorber
- 10.6 Adjusting the rebound damping of the shock absorber
- 10.7 Measuring the rear wheel dimension unloaded
- 10.8 Checking the static sag of the shock absorber
- 10.9 Checking the riding sag of the shock absorber
- 10.10 Adjusting the spring pretension of the shock absorber
- 10.11 Adjusting the riding sag
- 10.12 Checking the basic setting of the fork
- 10.13 Adjusting the fork air pressure
- 10.14 Adjusting the compression damping of the fork
- 10.15 Adjusting the rebound damping of the fork
- 10.16 Handlebar position
- 10.17 Adjusting the handlebar position
11 SERVICE WORK ON THE CHASSIS
- 11.1 Raising the motorcycle with a lift stand
- 11.2 Removing the motorcycle from the lift stand
- 11.3 Bleeding the fork legs
- 11.4 Cleaning the dust boots of the fork legs
- 11.5 Removing the fork legs
- 11.6 Installing the fork legs
- 11.7 Removing the fork protector
- 11.8 Installing the fork protector
- 11.9 Removing the lower triple clamp
- 11.10 Installing the lower triple clamp
- 11.11 Checking the play of the steering head bearing
- 11.12 Adjusting the steering head bearing play
- 11.13 Greasing the steering head bearing
- 11.14 Removing the start number plate
- 11.15 Installing the start number plate
- 11.16 Removing the front fender
- 11.17 Installing the front fender
- 11.18 Removing the shock absorber
- 11.19 Installing the shock absorber
- 11.20 Removing the seat
- 11.21 Mounting the seat
- 11.22 Removing the air filter box cover
- 11.23 Installing the air filter box cover
- 11.24 Removing the air filter
- 11.25 Cleaning the air filter and air filter box
- 11.26 Installing the air filter
- 11.27 Securing the air filter box cover
- 11.28 Sealing the air filter box
- 11.29 Removing the main silencer
- 11.30 Installing the main silencer
- 11.31 Changing the glass fiber yarn filling in the main silencer
- 11.32 Removing the fuel tank
- 11.33 Installing the fuel tank
- 11.34 Checking the chain for dirt
- 11.35 Cleaning the chain
- 11.36 Checking the chain tension
- 11.37 Adjusting the chain tension
- 11.38 Checking the chain, rear sprocket, engine sprocket, and chain guide
- 11.39 Checking the frame
- 11.40 Checking the swingarm
- 11.41 Checking the throttle cable routing
- 11.42 Checking the rubber grip
- 11.43 Adjusting basic position of clutch lever
- 11.44 Checking/correcting the fluid level of the hydraulic clutch
- 11.45 Changing the hydraulic clutch fluid
12 BRAKE SYSTEM
- 12.1 Checking the free travel of the hand brake lever
- 12.2 Adjusting the basic position of the hand brake lever
- 12.3 Checking the brake discs
- 12.4 Checking the front brake fluid level
- 12.5 Adding front brake fluid
- 12.6 Checking the front brake linings
- 12.7 Changing the front brake linings
- 12.8 Checking the free travel of foot brake lever
- 12.9 Adjusting the basic position of the foot brake lever
- 12.10 Checking the rear brake fluid level
- 12.11 Adding rear brake fluid
- 12.12 Checking the rear brake linings
- 12.13 Changing the rear brake linings
13 WHEELS, TIRES
- 13.1 Removing the front wheel
- 13.2 Installing the front wheel
- 13.3 Removing the rear wheel
- 13.4 Installing the rear wheel
- 13.5 Checking the tire condition
- 13.6 Checking the tire air pressure
- 13.7 Checking spoke tension
14 COOLING SYSTEM
- 14.1 Cooling system
- 14.2 Radiator cover
- 14.3 Installing the radiator cover
- 14.4 Removing the radiator cover
- 14.5 Checking the antifreeze and coolant level
- 14.6 Checking the coolant level
- 14.7 Draining the coolant
- 14.8 Refilling with coolant
15 TUNING THE ENGINE
- 15.1 Checking the play in the throttle cable
- 15.2 Adjusting the play in the throttle cable
- 15.3 Carburetor setting
- 15.4 Carburetor idle
- 15.5 Carburetor adjusting the idle speed
- 15.6 Plug-in connector of ignition timing map adjustment
- 15.7 Changing the ignition timing map
- 15.8 Checking the basic position of the shift lever
- 15.9 Adjusting the basic position of the shift lever
16 SERVICE WORK ON THE ENGINE
- 16.1 Emptying the carburetor float chamber
- 16.2 Checking the gear oil level
- 16.3 Changing the gear oil
- 16.4 Adding gear oil
17 CLEANING, CARE
- 17.1 Cleaning the motorcycle
18 STORAGE
- 18.1 Storage
- 18.2 Preparing for use after storage
19 TROUBLESHOOTING
20 TECHNICAL DATA
- 20.1 Engine
  - 20.1.1 All 125 models
  - 20.1.2 All 150 models
- 20.2 Engine tightening torques
- 20.3 Carburetor
  - 20.3.1 All 125 models
  - 20.3.2 Carburetor - basic setting for sandy surfaces (All 125 models)
  - 20.3.3 Carburetor tuning (All 125 models)
  - 20.3.4 All 150 models
  - 20.3.5 Basic carburetor setting for sandy surfaces (All 150 models)
  - 20.3.6 Carburetor tuning (All 150 models)
- 20.4 Capacities
  - 20.4.1 Gear oil
  - 20.4.2 Coolant
  - 20.4.3 Fuel
- 20.5 Chassis
- 20.6 Tires
- 20.7 Fork
  - 20.7.1 125/150 SX EU
  - 20.7.2 125/150 SX US
- 20.8 Shock absorber
  - 20.8.1 125/150 SX EU
  - 20.8.2 125/150 SX US
- 20.9 Chassis tightening torques
21 SUBSTANCES
22 AUXILIARY SUBSTANCES
23 STANDARDS
24 LIST OF ABBREVIATIONS
INDEX
- A
- B
- C
- D
- E
- F
- G
- H
- I
- K
- L
- M
- O
- P
- R
- S
- T
- U
- V
- W

KTM SX 125 2018 Owner's Manual

Pages 114

Year 2018

Language(s)

of 114

KTM SX 125 2018 Motorcycle Specification

The KTM SX 125 2018 is a high-performance motocross motorcycle engineered for competitive racing and advanced off-road riding. It features a lightweight, high-strength chromoly steel frame that ensures optimal handling and durability. Powered by a 124.8 cc single-cylinder, 2-stroke engine, the SX 125 delivers robust power and quick throttle response, making it ideal for aggressive track performance. The engine is equipped with a state-of-the-art power valve system, enhancing its versatility across various RPM ranges.

A key highlight of the 2018 model is its WP AER 48 front suspension, a sophisticated air fork system that offers adjustable damping and superior shock absorption. The rear suspension consists of a WP XACT shock with a linkage system, providing precise control and stability over diverse terrain. The bike is fitted with high-performance Brembo brakes, featuring a 260 mm front disc and a 220 mm rear disc, ensuring reliable stopping power under demanding conditions.

The KTM SX 125 2018 also incorporates cutting-edge ergonomics, with an adjustable handlebar position, a comfortable seat design, and a minimalist bodywork that allows for maximum rider movement and control. The bike's lightweight design, with a dry weight of approximately 87.5 kg, contributes to its agility and responsiveness.

Additionally, the SX 125 comes with a robust cooling system, including large radiators and optimized airflow, to maintain optimal engine temperatures during intense riding sessions. The bike is equipped with a 5-speed transmission, providing smooth and precise gear shifts. The overall design focuses on delivering a balance of power, control, and durability, making the KTM SX 125 2018 a top choice for serious motocross enthusiasts.

KTM SX 125 2018 Motorcycle F.A.Q.

What is the recommended maintenance schedule for the KTM SX 125 2018?

The recommended maintenance schedule for the KTM SX 125 2018 includes regular checks and services every 15 hours of use or after every race. Key maintenance tasks include oil changes, air filter cleaning, chain lubrication, and bolt tightening.

How do I troubleshoot starting issues with the KTM SX 125 2018?

If your KTM SX 125 2018 is having starting issues, check the spark plug for fouling, ensure the fuel is fresh and the carburetor is clean. Also, verify that the kill switch is in the correct position and that there are no electrical issues.

What type of oil is recommended for the KTM SX 125 2018 engine?

For the KTM SX 125 2018 engine, it's recommended to use a high-quality 2-stroke engine oil, such as Motorex Cross Power 2T, to ensure optimal performance and protection.

How do I adjust the suspension on the KTM SX 125 2018 for different terrains?

To adjust the suspension on the KTM SX 125 2018, first set the sag by adjusting the preload on the rear shock. Then, adjust the compression and rebound settings on the front forks and rear shock according to the terrain and riding style.

What are the common issues with the KTM SX 125 2018's carburetor and how can they be fixed?

Common carburetor issues with the KTM SX 125 2018 include clogging and improper jetting. Regular cleaning and ensuring the correct jetting for your altitude and temperature can help maintain optimal performance.

How can I improve the performance of my KTM SX 125 2018?

To improve the performance of your KTM SX 125 2018, consider upgrading the exhaust system, using high-quality fuel and oil, regularly cleaning the air filter, and fine-tuning the carburetor settings.

What tire pressure is recommended for the KTM SX 125 2018 for off-road use?

For off-road use, the recommended tire pressure for the KTM SX 125 2018 is typically between 12-15 psi, depending on terrain and rider preference.

How do I replace the air filter on the KTM SX 125 2018?

To replace the air filter on the KTM SX 125 2018, remove the seat to access the airbox, then remove the air filter cover and filter. Clean the airbox, install a new oiled filter, and reassemble.

What are the torque specifications for the KTM SX 125 2018?

The torque specifications for the KTM SX 125 2018 vary by component. For example, the cylinder head nuts should be torqued to 20 Nm, and the axle nuts to 40 Nm. Always consult the service manual for detailed specifications.

How do I bleed the brakes on the KTM SX 125 2018?

To bleed the brakes on the KTM SX 125 2018, attach a clear hose to the bleed valve, pump the brake lever, then open the valve to release air and fluid. Close the valve and repeat until only fluid comes out. Ensure the reservoir is filled with brake fluid.