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2012 KTM 250 SX-F

We dare anyone to find us a bike that has a better resume than the KTM 250 SX-F. Really, when you look at three consecutive MX2 world championship titles, it’s very difficult to top that, especially when the aforementioned 250 SX-F has been improved compared to its predecessor.

The new 250 SX-F is now available with a revamped chassis and an electric starter that proves its worth in many situations, turning the bike with the smallest four-stroke in the KTM MX range into a certified, world-class, championship-caliber moto cross bike.

The 250 SX-F’s compact, state-of-the-art DOHC four-stroke engine has been derived directly from the Marvin Musquin’s world championship bike, which means that it’s bigger and better than ever before. The 2012 model year of the 250 SX-F also comes with a new electric starter that excels with an extremely wide usable rev range and powerful performance from the bottom end up to beyond the nominal engine speed.

The 250 SX-F also has a new technology in the form of a Keihin engine management system with electronic fuel injection and electronic throttle valve control, ensuring spontaneous responsiveness and maximum performance from the engine.

As far as handling is concerned, the 250 SX-F’s state-of-the-art frame is made from high-quality chrome-molybdenum steel, a material that’s both lightweight and extremely durable, providing balanced geometry that combines playful handling with razor-sharp precision. The 250 SX-F’s linkage rear suspension bolsters playful handling and extreme traction while a lightweight aluminum swing arm has been designed for optimum lateral stiffness while the linkage of the now more tautly-set WP shock absorber via a lever system provides high progressiveness and wide adjustment ranges.

There’s plenty to love about the KTM 250 SX-F. The fact that it has a history of championship success only makes this bike that much more attractive to young and up-and-coming riders.

Find out more about the KTM 250 SX-F after the jump.

Engine

KTM 250 SX-F

The 250 SX-F’s compact, state-of-the-art DOHC four-stroke engine is equipped as standard with an electric starter for the 2012 model year. Derived directly from the Marvin Musquin’s world championship bike, it excels with an extremely wide usable rev range and powerful performance from the bottom end up to beyond the nominal engine speed.

Valve Train

KTM 250 SX-F

In the cylinder head with two overhead camshafts, four titanium valves are actuated by extremely lightweight, carbon-coated cam levers. This elaborate valve train, the ultra-light pistons and the 250 SX-F’s extremely short-stroke engine facilitate speeds of up to 13,400 1/min.

Bodywork

KTM 250 SX-F

The 250 SX-F’s bodywork with the very slim seat and spoiler lines, plus excellent contact points, perfects the bike’s ergonomics, making handling even simpler and more precise.

Frame and Suspension

KTM 250 SX-F

The 250 SX-F’s state-of-the-art frame made from high-quality chrome-molybdenum steel is not only extremely light and torsion-resistant. It is also characterised by a particularly balanced geometry that combines playful handling with razor-sharp precision.

The 250 SX-F’s linkage rear suspension bolsters playful handling and extreme traction. The lightweight aluminum swingarm is designed for optimum lateral stiffness, the linkage of the now more tautly-set WP shock absorber via a lever system provides high progressiveness and wide adjustment ranges.

Electric Starter

KTM 250 SX-F

Years ago, KTM proved that an electric starter is very advantageous even in the tough sport of motocross. That’s why the 250 SX-F can now also be started at the press of a button. For weight saving, the electric starter can be removed and a kickstarter installed in its place.

Specifications

KTM 250 SX-F
Design1-cylinder 4-stroke engine, water-cooled
Displacement248.60 cm³ (15.1706 cu in)
Bore76 mm (2.99 in)
Stroke54.80 mm (2.1575 in)
Starting aidElectric starter
Transmission6 speed, claw shifted
Engine lubricationForced oil lubrication with 2 Eaton pumps
Primary gear ration22:68
Final drive13:48
Cooling systemLiquid cooling system, continuous circulation of cooling liquid with water pump
ClutchWet multi-disc clutch / hydraulically operated
Ignition systemContactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan
FrameCentral tube frame made of chrome molybdenum steel tubing
ForksWP Suspension Up Side Down 4860 MXMA CC
Shock absorberWP Suspension 5018 BAVP DCC
Suspension travel Front300 mm (11.81 in)
Suspension travel Rear330 mm (12.99 in)
Brake systemDisc brakes, brake calipers on floating bearings
Brake discs - diameter Front260 mm (10.24 in)
Brake discs - diameter Rear220 mm (8.66 in)
Chain5/8 x 1/4"
Steering head angle63.5°
Wheel base1,495±10 mm (58.86±0.39 in)
Ground clearance (unloaded)375 mm (14.76 in)
Seat height (unloaded)992 mm (39.06 in)
Total fuel tank capacity approx.7.5 l (1.98 US gal)
Unleaded premium fuel (95 RON)
Weight without fuel approx.103.4 kg (228 lb.)

Quotes

Motorcycle-USA----"The smallest-bore SX-F gets the electric start treatment for 2012, making KTM’s entire line of camshaft-equipped racers complete with push-button starting. An optional kick starter assembly is available for the 250 SX-F from KTM’s in-house performance PowerParts catalogue. In addition to the magic button, the quarter-liter machine also gets new EMS mapping. The WP upside-down 48mm forks recieves new seals and bushings, while both ends get new valving settings. A new rear master cylinder has been fitted to the Brembo brake system. "



1 comments:

Too bad you posted a picture of the 2 stroke motor

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