For 2014, the lively 4-stroke receives a completely new DOHC engine distinguished mainly by significantly more torque than its predecessor. The new power plant, the optimized frame and the new bodywork make the 250 XCF-W more than ever a winner's bike bound to define the new benchmark of its class.
Features May Include:
The new 250 XCF-W now also uses the proven DDS (Damped Diaphragm Steel) clutch with a wear-free clutch basket and diaphragm spring. The basket is machined from high tensile steel in one piece together with the primary drive gear. This process guarantees unbeatable reliability and contributes to the narrow engine width due to its compact rivet-less design. Additionally, it allows the use of thin steel linings which also contribute to the compact clutch dimensions. The diaphragm spring makes it possible to implement an additional rubber damping system inside the clutch hub, guaranteeing reliability for the transmission and good traction. In addition, a stronger inner hub further increases stability. Finally, the hydraulic clutch mechanism by Brembo in conjunction with the diaphragm spring guarantees a very light operation and good controllable modulation of the clutch.
The new 250 XCF-W's crankshaft has a 5 percent heavier flywheel to achieve optimum traction. Like last season's KTM SX-F models, it now has a plain big end bearing. The previous needle bearing is replaced by two force-fitted bearing shells that run directly on the crank pin. The necessary oil feed for this bearing is ensured by the engine's pressure lubrication. This design increases the engine's long-term durability, allowing to lengthen the crankshaft service interval - a customer benefit with respect to time, effort and cost.
In order to balance the mass-forces, the 250 XCF-W engine uses a multifunctional counter balance shaft which also drives the water pump and timing chain.
For 2014, the KTM engineers lit up the next evolutionary stage and designed a brand new cutting-edge DOHC engine combining their concentrated engine know-how from racing and development. The new generation's construction shares many base components with the successful 350 XCF-W engine. This achieves a preceptible increase of torque up to 4 Nm between 6,000-7,000 rpm.
A completely new crankcase design, which is now pressure die-cast allows to reduce the wall thicknesses significantly, compared to cases produced by gravity die-cast. A new aluminum alloy which at the same time has great tensile strength ensures a high resilience against stone-chipping and other damage.
ENGINE MANAGEMENT SYSTEM (EMS)
The Engine Management System (EMS) by Keihin with electronic fuel injection and 42mm throttle body ensures a spontaneous response and maximum engine performance. An oil-cooled 196 W AC alternator provides sufficient energy for the fuel injection, lighting and other electrical loads. A newly-designed ECU ensures even faster and absolutely reliable data processing. With an optional map-select switch from the KTM PowerParts program, EMS allows selecting different engine characteristics. In additon, the optional User-Setting Tool allows to readout engine data with a laptop and change the ignition and injection mappings with a few mouse clicks.
Specially developed for the 250 XCF-W, the new 6-speed enduro gear box has slightly shorter gear ratios in 4th, 5th and 6th gear than the predecessor. The new transmission is distinguished by easy and precise shifting. The final drive gear ratio has been matched to the new gear box.