KTM SX

KTM SX

KTM is an Austrian motorcycle company. It is famous for its off-road vehicles. Since 2006, the company has been producing the SX series, a line of motocross motorcycles.

Model range

KTM SX 50

The KTM 50 SX model is equipped with a two-stroke engine with a volume of 49 cc. It is single-cylinder, air-cooled and has a carburetor. The gearbox is a single-speed automatic with a centrifugal clutch and a chain drive.

All elements are mounted on a two-section frame made of pipes. The suspension includes a WP-USD AER 35 mm telescopic fork with a travel of 205 mm at the front and a WP shock absorber at the rear with a travel of 185 mm. Braking is provided by 160 mm diameter discs at the front and rear, which guarantees excellent response to pressure.

KTM SX 65

The KTM 65 SX is a popular motocross bike that KTM has been producing since 2006. In 2010, the model was updated. A new ignition cover appeared, improving tightness. The engine casing was also updated, increasing its reliability. The Austrian manufacturer also introduced a racing version of the SXS. Engine power increased from 16 to 19.5 HP.

The model stands out externally with a high-mounted front fender, wide handlebars, a one-piece seat, an exhaust system under the seat, a double-sided swingarm and wheels with wire spokes, shod with off-road Bridgestone tires. The motorcycle’s suspension includes a WP-USD AER telescopic fork with a diameter of 35 mm in front with a travel of 215 mm and a WP shock absorber at the rear with a wheel travel of 270 mm.

KTM SX 125

The 125 SX has been in production since 2017. A steel frame with a 25CrMo4 central tube supported the suspension. It included 48 mm WP AER upside-down telescopic forks with 300 mm of travel at the front and a WP shock absorber at the rear.

The 2017 KTM 125 SX was powered by a 124 cc, liquid-cooled, two-stroke, single-cylinder engine. The engine was bolted to the frame and was paired with a six-speed gearbox.

KTM SX 150

The 2017 KTM 150 SX was powered by a 143 cc, liquid-cooled, two-stroke, single-cylinder engine. It was fed by a Mikuni carburetor and was paired with a six-speed chain-driven gearbox.

At the front there is a WP-USD AER telescopic fork with a diameter of 48 mm and a travel of 310 mm, while at the rear there is a WP shock absorber with 300 mm of travel.

KTM SX 250 / SX-F 250

The appearance of the bike resembles other SX models. It had spoked wheels with blacked-out rims, off-road tires, a raised front fender, a single seat and a single exhaust pipe with a muffler on the right. The suspension is attached to a chromoly frame with a central tube. At the front there is a WP-USD AER 48 mm fork with 300 mm of travel, while at the rear there is a WP shock absorber with 300 mm of travel.

The KTM 250 SX-F engine is a 249 cc liquid-cooled four-stroke engine. It is controlled by a carburetor, and the torque is transmitted to the rear wheel via a chain drive.

KTM SX 350

The KTM 350 SX-F suspension included 48 mm WP-USD AER forks with 300 mm of travel at the front and a WP shock absorber at the rear with 300 mm of travel. The frame was made of chromoly steel with a central tube. Two brake discs provided braking power. The front disc was 260 mm in diameter, and the rear disc was 220 mm. This provided excellent stopping power in all conditions.

The motorcycle is equipped with a four-stroke single-cylinder engine with a volume of 349 cc. It has a fuel injection system, liquid cooling, and it develops 60 HP at 13,400 rpm. Power is transmitted to the rear wheel via a chain.

KTM SX 450

The model since 2018 has been equipped with a powerful and compact engine, as well as a number of improvements that have significantly increased its efficiency.

The engine has a new lightweight cylinder head. This has improved the weight distribution, controllability and maneuverability of the motorcycle. The strength of the crankshaft has been increased due to a stronger connecting rod and an improved bearing, which has increased reliability under high loads. The KTM 450 SX-F is equipped with a four-stroke single-cylinder engine with a volume of 449 cc with liquid cooling. It produces 62 HP and works with a five-speed gearbox.