The 350 XCF-W has a heavier crankshaft in order to achieve a more even power delivery and better traction through the greater gyrating mass. 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.
The DOHC cylinder head contains four ultra-lightweight titanium valves (intake 36.3mm, exhaust 29.1mm), activated by two overhead camshafts via very small, DLC coated followers that weigh only 8g. The super lightweight design allows for extremely high engine speed levels of up to 12,000 rpm. The camshaft timing is perfectly tuned for performance in low end for Enduro specific performance.
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.
The 350cc 4-stroke engine with a state-of-the-art electronic fuel injection system offers a very wide power band and is distinguished by a dynamic but fatigue proof power delivery. At over 45hp of maximum power, the 350 XCF-W is strong enough to beat any 450 in it's class.
Engine Management System (EMS)
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 350 XCF-W engine is equipped with a 196 W alternator with integrated starter freewheel. The alternator provides sufficient energy for the fuel injection, lighting and other electrical loads. The oil-cooled rotor has a larger diameter with a bigger flywheel mass and is contained in a larger ignition cover.
The 350 XCF-W is equipped with a kick-starter as well as electric starter as standard. The electric starter is well protected behind the cylinder.
The 6-speed gearbox is specially matched to the power delivery of the 350cc engine and any kind of off-road duty. It is distinguished by easy and precise shifting.
The crankshaft drives an intermediate multifunctional shaft on the side, which in turn drives the coolant pump and the two camshafts via the cam chain, while also acting as a counter balancer. A hydraulic chain tensioner ensures reliable chain tension to achieve highly precise valve timing.