In order to balance and smooth engine vibrations, the engine uses a counter balance shaft, which doubles as a water pump drive.
The crankshaft and ultra-lightweight connecting rod are made by Pankl from special high-tensile strength steel. The crankshaft employs a plain big end bearing, and two force-fitted bearing shells 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, and lengthens crankshaft service intervals, which is a customer benefit in terms of time, effort and cost.
A single overhead camshaft activates two titanium intake valves and two steel exhaust valves. The weight-optimized valve train has low friction for improved performance as well as low engine braking action.
The one-piece basket of the DDS clutch (damped diaphragm steel) is machined from solid high-tensile steel in one solid part together with the primary drive gear. This process guarantees unbeatable reliability and, together with the thin steel linings, contributes to the narrow engine width due to a compact rivet-less design. The diaphragm spring makes it possible to implement an additional rubber damping system inside the clutch hub, ensuring reliability for the transmission and excellent traction. Finally, the hydraulic clutch mechanism by Brembo in conjunction with the diaphragm spring provides a very light clutch operation and controllable modulation.
Developed for tough off-road duty, the SOHC engine with 510.4cc is distinguished by an extremely compact design, easy maintenance and excellent durability at a minimal weight. Together with the Keihin EFI system, this provides unrivalled enduro specific performance and rideability.
Engine management system
The Engine Management System by Keihin with electronic fuel injection via a 42mm throttle body ensures a snappy response and maximum engine performance. An oil-cooled 196 W alternator provides sufficient energy for the fuel injection, lighting and other electrical loads. With an optional map-select switch from the Power Parts program, the EMS can allow the rider to select different engine characteristics. In addition, the optional User-Setting-Tool provides the ability to readout engine data with a laptop and change the ignition and injection mapping with just a few mouse clicks.
The lightweight, forged bridged box-type piston shares its high performance piston rings with the 450 SX-F.
The 500 XC-W is equipped with a kickstarter as well as electric starter as standard. The electric starter is well protected behind the cylinder.
The proven 6-speed gearbox is distinguished by easy and precise shifting.