2021 KTM 450 SX-F Dirt Motorcycle Review Specs

2021 KTM 450 SX-F Dirt Motorcycle

The KTM 450 SX-F is the industry standard, thanks to its championship-winning formula. This equipment will continue to work at a high level and be simple to use in 2021. This engine has a single overhead camshaft cylinder head, which is incredibly small, and an electronic fuel injection system that is exceptionally efficient. Fastest Motocross bike out there? The KTM 450 SX-F.

2021 KTM 450 SX-F Dirt Motorcycle – Features and Specs


The exhaust on all 4-stroke models plays a critical part in power delivery and performance, and it delivers a punch that is hard to match. Model-specific header pipes with an improved resonator dubbed FDH (Flow Design Header) are included. Since the brand new shock absorber does not need to be detached, this design makes it extremely easy to service the shock. The internal arrangement of the silencer and the aluminum sleeve, end cap, and sleeve enable the bike to seem thinner while meeting regulatory noise restrictions.

2021 KTM 450 SX-F Dirt Motorcycle


KTM’s professional motocross offering would be incomplete without a 450-cc engine. It has a single overhead camshaft cylinder head powered by the newest electronic injection technology, making it compact and lightweight. It allows the outstanding power to be dispersed across the rpm range incredibly efficiently. Although it has an excellent electronic starter, this 450-cc engine is still the lightest one on the MX market even with that.


In combination with the intake snorkels, the KTM 450 SX-airbox F’s guarantee excellent flow dynamics; it results in maximum power and speedy throttle response. The design also provides optimal protection against air filter sludge buildup; despite its evident performance benefits Installing the Twin-Air air filter correctly is made easier thanks to the filter’s sturdy cage. As with prior KTM models, filter maintenance is simple and doesn’t need special equipment. With the included Power Parts airbox cover (in the by-pack) having more air intake holes for increased engine performance, every SX-F comes with an additional Power Parts airbox that can be adjusted for various engine characteristics or track conditions.


Hydroformed steel tubes are used to build the KTM 450 SX-frame F’s, which have been robot welded to provide the most significant levels of quality consistency. The frame’s stiffness is carefully designed to give responsive handling and to work flawlessly with the suspension to produce agility and high-speed stability. The 2020 KTM SX frames are powder coated for long-term durability, and frame covers are included as standard equipment. Aluminum is used for the subframe, which is lightweight and gives the rider a fantastic sense of responsiveness and ease of movement over the seat.


It’s possible to keep your footpeg pivot free of clogging even while digging into deep ruts thanks to ‘no-dirt’ foot pedals. Want to ride in a more raised position? The 2019 EXC models’ footpegs, which are 6 millimeters taller than the SX versions, may then be installed.

2021 KTM 450 SX-F Dirt Motorcycle


Every KTM SX model is armed with a seat designed to complement the range’s dynamic performance ergonomics flawlessly. The silicone stripes on the seat cover improve the rider’s sense of touch and grip. One long, lateral screw makes it easy to attach the seat to the bike.

Handlebar Map Select Switch

The map switch allows the rider to choose between a conventional map and an aggressive map for loamy, high-grip dirt situations with a single button push. It is beneficial if the track conditions change or if the rider needs greater control as the ride progresses and he becomes fatigued.


All SX-F models come standard with a 2 Ah Lithium-Ion starter battery, which is capable and very light, making it ideal for cold-weather starting. Underneath the driver’s seat is a common location for all electrical components, including the voltage regulator and condenser.

2021 KTM 450 SX-F Dirt Motorcycle – Price

The new 2021 KTM 450 SX-F Dirt Bike is available at $10,199 only.

2021 KTM 450 SX-F Dirt Motorcycle

2021 KTM 450 SX-F Dirt Motorcycle – Technical Specifications


Transmission 5-speed
Starter Electric starter
Stroke 63.4 mm
Bore 95 mm
Clutch Wet, DDS multi-disc clutch, Brembo hydraulics
Displacement 449.9 cm³
EMS Keihin EMS
Design 1-cylinder, 4-stroke engine


Weight (Without Fuel) 100 kg
Tank Capacity (Approx.) 7 l
Front Brake Disc Diameter 260 mm
Rear Brake Disc Diameter 220 mm
Front Brake Disc brake
Rear Brake Disc brake
Chain 5/8 x 1/4″
Frame Design Central double-cradle-type 25CrMo4 steel
Front Suspension WP XACT-USD, Ø 48 mm
Ground Clearance 370 mm
Rear Suspension WP XACT Monoshock with linkage
Seat Height 950 mm
Steering Head Angle 63.9 °
Suspension Travel (Front) 310 mm
Suspension Travel (Rear) 300 mm