250 SX-F - 2020

£8,049.00



Model Description

The KTM 250 SX-F was primed for global domination and is set to continue its dominance for 2020. Not only is it the lightest bike in its class, but it also offers an unrivalled, confidence-inspiring power delivery, making it a great choice for both amateur and professional riders. Laying the power down effectively is the secret to fast lap times and this capable package has all the right credentials to get the most important job done - getting to the chequered flag first.
 
ENGINE MANAGEMENT SYSTEM
The state-of-the-art Keihin engine management system with electronic fuel injection features a 44 mm throttle body. As a result of the innovative positioning of the injector, the engine responds immediately, delivers enormous power and guarantees perfect atomization of the fuel with the upstreaming air. There are also separate systems available for cold start and idle adjustments. The control unit always provides an optimal fuel supply and ignition timing. In addition, it regulates the traction and launch control  functions. There are also different maps available for specific power curves depending on which gear is currently engaged. This information is provided by the gear position sensor.

CRANKSHAFT
The KTM 250 SX-F crankshaft features a short connecting rod with a plain big (bottom) end bearing with two force-fitted shells running directly on the crank pin. This design is a key prerequisite for the extremely high revs and the unrivaled maximum power output of the 250cc engine. At the same time, it extends the life of the engine and results in long crankshaft service intervals, which is an important customer benefit in terms of waiting times, the amount of work required and costs.

BALANCER SHAFT
To balance out the mass forces, the engine in the KTM 250 SX-F is fitted with a multifunctional balancer shaft, which also drives the coolant pump and the timing chain.
 
E-STARTER
As is the case with all KTM 4-stroke bikes, the KTM 250 SX-F can also be started at the push of a button – an invaluable benefit when the going gets tough. A strong starter motor from Mitsuba and a reliable starter drive ensure that the engine starts every time.

CYLINDER & PISTON
Inside the short-stroke cylinder, which has a bore of 78 mm, there is a lightweight, extremely rigid forged bridged box-type piston produced by CP. The piston crown geometry has been adapted perfectly to the combustion chamber and the high compression ratio of 14.4:1. As a result of the low oscillating masses, the engine delivers an extremely lively performance.

CLUTCH
The KTM 250 SX-F is equipped with a lightweight DS (diaphragm steel) clutch with a one-piece outer clutch hub and a primary gear made of high strength billet steel. This guarantees unbeatable reliability and, due to its compact, rivetless construction, results in a compact engine design. Extremely heat-resistant steel clutch plates ensure smooth disengagement of the clutch. Fitted with a diaphragm spring, very little force is required to operate the clutch. The Brembo hydraulic system also ensures easy and precise action.

ENGINE CASE & COVERS
The die-cast engine case has been designed to reduce weight and provide a very centralized shaft configuration. This has resulted in a single-cylinder engine that is both short and compact with excellent centralization of masses. The covers with their modern surface structure are designed to reduce wear caused by the rider's boots.
 
CYLINDER HEAD
The centerpiece of the compact DOHC engine is a cutting-edge cylinder head, featuring two overhead camshafts driving titanium valves (intake 32.5 mm, exhaust 26.5 mm) via super lightweight cam followers with a hard DLC (Diamond-Like Carbon) coating.

ENGINE
It is common knowledge that the KTM 250 SX-F single-cylinder is the most powerful engine in MX2 competition. The engine boasts an unbeatable power curve throughout the entire rpm range to its maximum of 14,000 rpm. Its compact architecture contributes to an excellent centralization of the masses. Combined with a low engine weight of 25.9 kg, this is a major reason for the bike's easy handling and rideability – and that, including the extremely useful E-starter. In short, the combination of compact engine layout and unrivaled performance make the KTM 250 SX-F once again an undisputed winner – for both amateurs and professionals.

TRANSMISSION
The KTM 250 SX-F delivers power from the engine to the rear wheel via a reworked 5-speed transmission, which offers the additional benefits of maximum durability and reliability. KTM's advanced No-Dirt technology is used for the gear shift lever to prevent mud and dirt from fouling the lever joint and thus guarantees reliable gear changing at all times. All 4-stroke engines are equipped with a gear position sensor to be able to select a different engine power curve in each gear.

Model Specification

Engine

Engine Type

Single cylinder, 4-stroke

Displacement

249.9 cc

Starter

Electric starter / Lithium Ion 12V 2.2Ah

Transmission

5 gears

Engine Lubrication

Pressure lubrication with 2 oil pumps

Cooling

Liquid cooled

Clutch

Wet multi-disc DS clutch, Brembo hydraulics

Ignition

Keihin EMS

Frame

Frame

Central double-cradle type

Chain

5/8 x 1/4

Steering Head Angle

63.9 degrees

Tank Capacity

7 litres

Performance

Primary Gear Ratio

24:73

Secondary Gear Ratio

14:51

Brake System Front

Disc brake 260 mm

Brake System Rear

Disc brake 220 mm

Suspension

Front Suspension

XACT WP upside-down fork, 48 mm

Rear Suspension

XACT WP shock absorber with linkage

Suspension Travel Front

310 mm

Suspension Travel Rear

300 mm

Dimensions

Bore

78 mm

Stroke

52.3 mm

Wheelbase

1485 mm

Ground Clearance (unloaded)

370 mm

Seat Height

950 mm

Weight (No Fuel)

99 kg

Servicing

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