KTM 250 SX-F 2021 User Manual

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KTM 250 SX-F 2021

The KTM 250 SX-F is a high-performance motocross motorcycle manufactured by KTM, an Austrian motorcycle company known for its off-road prowess. The 2021 model of the KTM 250 SX-F represents an exceptional motocross bike built for competitive racing.

The KTM 250 SX-F is designed to offer riders exceptional power, agility, and handling on the motocross track. It features cutting-edge technology and advanced engineering to provide a winning edge to riders.

At the heart of the 2021 KTM 250 SX-F is a potent 250cc, four-stroke engine. This engine configuration delivers smooth and manageable power, allowing riders to optimize traction and control during races. The engine incorporates advanced features such as a lightweight and compact DOHC (Double Overhead Camshaft) cylinder head, electronic fuel injection for precise fuel delivery, and electric start for convenience.

The motorcycle’s chassis is designed to optimize handling and maneuverability. It features a lightweight frame constructed with high-quality materials, providing excellent stability and responsiveness on the track. The suspension system consists of top-of-the-line components, including advanced front forks and a rear shock absorber, offering exceptional suspension travel and adjustability to tackle the challenges of motocross racing.

The 2021 KTM 250 SX-F also integrates advanced electronics and rider aids to enhance performance and control. These features may include traction control, launch control, and selectable engine mapping, allowing riders to customize the bike’s characteristics to suit various track conditions and riding styles.

Ergonomics are carefully considered in the design of the motorcycle. It features a well-positioned seat, adjustable handlebars, and footpegs that provide optimal control and support during intense racing maneuvers. The bike’s bodywork is slim and ergonomic, enabling riders to easily move around and maintain a stable riding position.

Additional features of the 2021 KTM 250 SX-F may include high-performance braking systems, a lightweight exhaust system, and durable wheels and tires designed specifically for motocross racing.

Overall, the 2021 KTM 250 SX-F is a top-of-the-line motocross bike that offers outstanding performance, agility, and handling. It is built for riders who demand the best in terms of power, control, and competitiveness in motocross racing.

Cold start button

(The cold start button1is fitted to the bottom of the throttle valve body. The electronic fuel injection system extends the injection time if the engine is cold and the ambient temperature is low. To help the engine burn the increased fuel quantity, it must be supplied with additional oxygen by pushing the cold start button. After briefly opening up the throttle and then releasing the throttle grip again, or turning the throttle grip towards the front, the cold start button returns to its original position.

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.

Only operate this vehicle in closed-off areas remote from public road traffic. This vehicle is designed for use in offroad endurance competition, and not primarily for use in motocross.


The vehicle must only be used as intended. Dangers can arise for people, property, and the environment through use not as intended. Any use of the vehicle beyond the intended and defined use constitutes misuse. Misuse also includes the use of operating and auxiliary fluids which do not meet the required specification for the respective use.

Safety advice
A number of safety instructions need to be followed to operate the product described safely. Therefore read this instruction and all further instructions included carefully. The safety instructions are highlighted in the text and are referred to at the relevant passages.

Various information and warning labels are attached in prominent locations on the product described. Do not remove any information or warning labels. If they are missing, you or others may not recognize the dangers and may therefore be injured.

Identifies a danger that will immediately and invariably lead to fatal or serious permanent injury if the
appropriate measures are not taken.
Identifies a danger that is likely to lead to fatal or serious injury if the appropriate measures are not
Identifies a danger that may lead to minor injuries if the appropriate measures are not taken.
Identifies a danger that will lead to considerable machine and material damage if the appropriate measures are
not taken.
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:

  1. 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 2 the use of the vehicle after such device or element of the design has been removed or rendered inoperative by any person.

Among those acts presumed to constitute tampering are the acts listed below:

  1. Removal or puncturing of the main silencers, baffles, header pipes or any other components which conduct exhaust gases.
  2. Removal or puncturing of parts of the intake system.
  3. Lack of proper maintenance.
  4. 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
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.

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.

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 are promptly eliminated by an authorized KTM workshop. Adhere to the information and warning labels on the vehicle.

Protective clothing
Risk of injury Missing or poor protective clothing presents an increased safety risk.

  • Wear appropriate protective clothing such as helmets, 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
Unless specified otherwise, the ignition must be turned off during all work (models with the ignition lock, models with remote key) or the engine must be at a standstill (models without ignition lock or remote key). 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 that cannot be reused (e.g. self-locking screws and nuts, expansion screws, 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. If a screw adhesive (e.g., Precote®) has already been applied to a new part, do not apply any additional thread locker. 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.

If you use your motorcycle responsibly, you can ensure that problems and conflicts do not occur. To protect the future of the motorcycle sport, make sure that you use your motorcycle legally, display environmental consciousness, and respect the rights of others. When disposing of used oil, other operating and auxiliary fluids, and used components, comply with the laws and regulations of the respective country. Because motorcycles are not subject to the EU regulations governing the disposal of used vehicles, there are no legal regulations that pertain to the disposal of an end-of-life motorcycle. Your authorized KTM dealer will be glad to advise you.

Owner’s Manual
Read this owner’s manual carefully and completely before making your first trip. The Owner’s Manual contains useful information and many tips on how to operate, handle, and service your motorcycle. This is the only way to find out how best to customize the vehicle for your own use and how you can protect yourself from injury.

Store the Owner’s Manual on your terminal device, for example, so that you can read it whenever you need to. If you would like to know more about the vehicle or have questions on the material you read, please contact an authorized KTM dealer. The Owner’s Manual is an important component of the vehicle. If the vehicle is sold, the Owner’s Manual must be downloaded again by the new owner. The Owner’s Manual can be downloaded several times using the QR code or the link on the delivery certificate. The Owner’s Manual is also available for download from your authorized KTM dealer and on the KTM website. A printed copy can also be ordered from your authorized KTM dealer.
International KTM Website:

The figures contained in the manual may depict special equipment. In the interest of clarity, some components may be shown disassembled or may not be shown at all. It is not always necessary to disassemble the component to perform the activity in question. Please follow the instructions in the text.

Customer service
Your authorized KTM dealer will be happy to answer any questions you may have about your vehicle and KTM. A list of authorized KTM dealers can be found on the KTM website.
International KTM Website:

Reference Link

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