KTM 125 SX 2020 User Manual
The KTM 125 SX is a motocross motorcycle introduced by KTM, an Austrian motorcycle manufacturer. The 125 SX is designed specifically for motocross racing and is known for its lightweight construction, powerful engine, and agile handling. The 2020 model of the KTM 125 SX builds upon the previous successes of its predecessors, offering improved performance and features.
The centerpiece of the KTM 125 SX is its engine, which is a high-performance 125cc two-stroke powerplant. Two-stroke engines are favored in motocross racing for their power-to-weight ratio and instant throttle response. The 125 SX’s engine is known for delivering impressive power and torque in the high rev range, providing riders with the acceleration and top-end performance needed to tackle motocross tracks.
In terms of design and construction, the KTM 125 SX features a lightweight and agile chassis. It is built around a high-strength chromoly steel frame, which provides excellent rigidity and durability while keeping the weight low. The motorcycle incorporates top-notch suspension components, such as fully adjustable WP XACT forks at the front and a WP XACT shock absorber at the rear, allowing riders to fine-tune the suspension settings to match their riding style and track conditions.
The 125 SX is also equipped with advanced features and technologies to enhance its performance. It includes a hydraulic clutch system, which provides precise and consistent clutch control, reducing rider fatigue during races. The motorcycle features Brembo brakes, known for their exceptional stopping power and control. Additionally, the KTM 125 SX comes with modern ergonomics, offering a comfortable riding position and control layout that allows riders to maneuver the bike with ease.
As a dedicated motocross bike, the KTM 125 SX does not have features commonly found on road-going motorcycles, such as lights, indicators, or mirrors. Its design and components are optimized for racing performance on closed tracks.
In summary, the KTM 125 SX 2020 is a high-performance motocross motorcycle designed for racing enthusiasts. With its powerful two-stroke engine, lightweight construction, and agile handling, it offers an exhilarating riding experience on motocross tracks. The KTM 125 SX is a formidable choice for riders looking to compete in the 125cc class and push their limits in the world of motocross racing.
Use definition – intended use
This vehicle has been designed and built to withstand the normal stresses and strains of racing. This vehicle complies with the currently valid regulations and categories of the top international motorsports organizations.
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Only operate this vehicle in closed-off areas remote from public road traffic.
Refueling
Danger
Fire hazard Fuel is highly flammable. The fuel in the fuel tank expands when warm and can escape if overfilled.
- Do not refuel the vehicle in the vicinity of open flames or lit cigarettes.
- Switch off the engine for refueling.
- Make sure that no fuel is spilled; particularly not on hot parts of the vehicle.
- If any fuel is spilled, wipe it off immediately.
- Observe the specifications for refueling.
Warning
Danger of poisoning Fuel is poisonous and a health hazard.
- Avoid skin, eye and clothing contact with fuel.
- Immediately consult a doctor if you swallow fuel.
- Do not inhale fuel vapors.
- In case of skin contact, rinse the affected area with plenty of water.
- Rinse the eyes thoroughly with water, and consult a doctor in case of fuel contact with the eyes.
- Change your clothing in case of fuel spills on them.
Note
Environmental hazard Improper handling of fuel is a danger to the environment.
- Do not allow fuel to enter the groundwater, the soil, or the sewage system..
Note
Identifies a danger that will lead to considerable machine and material damage if the appropriate measures are not taken.
Note
Indicates a danger that will lead to environmental damage if the appropriate measures are not taken.
Tampering warning
Tampering with the noise control system is prohibited. Federal law prohibits the following acts or the causing thereof:
- The removal or rendering inoperative by any person other than for purposes of servicing, repair, or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control prior to its sale or delivery to the ultimate purchaser or while it is in use, or
- the use of the vehicle after such device or element of design has been removed or rendered inoperative by any person.
Among those acts presumed to constitute tampering are the acts listed below:
- Removal or puncturing of the main silencers, baffles, header pipes or any other components which conduct exhaust gases.
- Removal or puncturing of parts of the intake system.
- Lack of proper maintenance.
- Replacing moving parts of the vehicle, or parts of the exhaust system or intake system, with parts other than those specified by the manufacturer.
Safe operation
Danger
The danger of accidents A rider who is not fit to ride poses a danger to him or herself and others.
- Do not operate the vehicle if you are not fit to ride due to alcohol, drugs or medication.
- Do not operate the vehicle if you are physically or mentally impaired.
Danger
The danger of poisoning Exhaust gases are toxic and inhaling them may result in unconsciousness and death.
- Always make sure there is sufficient ventilation when running the engine.
- Use effective exhaust extraction when starting or running the engine in an enclosed space.
Warning
The danger of burns Some vehicle components become very hot when the vehicle is operated.
- Do not touch any parts such as the exhaust system, radiator, engine, shock absorber, or brake system before the vehicle parts have cooled down.
- Let the vehicle parts cool down before you perform any work on the vehicle.
Only operate the vehicle when it is in perfect technical condition, in accordance with its intended use, and in a safe and environmentally compatible manner. The vehicle should only be used by trained persons. Have malfunctions that impair safety promptly eliminated by an authorized KTM workshop. Adhere to the information and warning labels on the vehicle.
Protective clothing
Warning
Risk of injury Missing or poor protective clothing presents an increased safety risk.
- Wear appropriate protective clothing such as helmet, boots, gloves as well as trousers and a jacket with protectors on all rides.
- Always wear protective clothing that is in good condition and meets the legal regulations. In the interest of your own safety, KTM recommends that you only operate the vehicle while wearing protective clothing.
Work rules
Special tools are necessary for certain tasks. The tools are not a component of the vehicle, but can be ordered using the number in parentheses.
Example: bearing puller (15112017000) During assembly, use new parts to replace parts which cannot be reused (e.g. self-locking screws and nuts, seals, sealing rings, O-rings, pins, and lock washers). In the case of certain screws, a screw adhesive (e.g. Loctite®) is required. Observe the manufacturer’s instructions. After disassembly, clean the parts that are to be reused and check them for damage and wear. Change damaged or worn parts. After completing a repair or service work, check the operating safety of the vehicle.
Air suspension AER 48
Air suspension WP Suspension AER 48 is used in the fork. In this system, suspension is located in the left fork leg and damping in the right fork leg. As fork springs are no longer required, a significant weight advantage is achieved when compared to conventional forks. The response on slightly uneven surfaces is significantly improved. In normal driving mode, suspension is provided exclusively by an air cushion. A steel spring is located in the left fork leg as an end stop.
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If the fork is frequently overloaded, then the air pressure in the fork must be increased to avoid damage to the fork and frame. The air pressure in the fork can be quickly adjusted to the rider’s weight, surface conditions and the rider’s preference using a fork airpump. The fork does not have to be dismantled. The time consuming mounting of harder or softer fork springs is not required. If the air chamber loses air due to a damaged seal, the fork will still not sag. In this case the air is retained in the fork. The suspension travel is maintained as far as possible. The damping becomes harder and the riding comfort reduces. As with a conventional fork, the damping can be adjusted in rebound and compression stages. The rebound adjuster is located at the lower end of the right fork leg.
Spare parts, accessories
For your own safety, only use spare parts and accessory products that are approved and/or recommended by KTM and have them installed by an authorized KTM workshop. KTM accepts no liability for other products and any resulting damage or loss. Certain spare parts and accessory products are specified in parentheses in the descriptions. Your authorized KTM dealer will be glad to advise you. The current KTM PowerParts for your vehicle can be found on the KTM website.
International KTM Website: http://www.ktm.com
Service
A prerequisite for perfect operation and prevention of premature wear is that the service, care, and tuning work on the engine and chassis is properly carried out as described in the Owner’s Manual. An incorrect suspension setting can lead to damage and breakage of chassis components. Use of the vehicle under difficult conditions, such as on sand or on wet and muddy surfaces, can result in significantly increased wear of components, such as the drive train, brake system, or suspension components. For this reason, it may be necessary to inspect or replace parts before the next scheduled service. It is imperative that you adhere to the stipulated run-in times and service intervals. If you observe these exactly, you will ensure a much longer service life for your motorcycle. The relevant mileage or time interval is whichever occurs first.
Reference Link
Download Link: https://www.ktm.com/en-us/service/manuals.html