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.