500 EXC AUS: NOW WITH EVEN MORE PERFORMANCEBack to Bike Next Benefit
With the 500 EXC's newly developed engine, KTM engineers have created a new dimension: The power unit has been redesigned from scratch and is now more compact, lighter and more powerful than before. Reduced reciprocating weight and a balancer shaft minimise vibration.
The newly developed Keihin engine management system with electronic fuel injection ensures spontaneous responsiveness from the engine. Various engine characteristics can be activated with an optional map select switch.
NEW OIL CIRCUIT
The 500 EXC's new engine is equipped with a common oil circuit for engine and transmission, and two oil pumps. A pressure pump lubricates the engine, while a suction pump draws oil from the crankcase, using it to lubricate the transmission and the clutch. At the same time and in conjunction with a steel diaphragm, negative pressure arises in the casing, which boosts the engine power.
NEW BALANCER SHAFT
The 500 EXC's new, more compact balancer shaft not only eliminates vibration, but also serves as the drive for the water pump. This intelligent multi-functionality contributes to the compactness and low weight of the 500 EXC's new engine.
NEW ENGINE CASE
The 500 EXC's new engine case weighs almost 2 kg less than its predecessor, although it offers better resistance to damage due to stone impact or falls. This has been achieved by using a high-strength, elastic aluminium alloy and changing from sand-casting to die-casting.
When designing the new crankshaft on the 450 EXC, KTM engineers focussed on reducing the reciprocating weight. Thanks to the new, lighter connecting rod and the new, lighter piston, they managed to achieve minimum vibration, while maximising engine-speed strength.
NEW CYLINDER AND PISTON
The 500 EXC's cylinder has been further developed especially for the new engine configuration. The new, 15 % lighter forged piston minimises reciprocating weight and optimises durability at high engine speeds. New, nitrided piston rings ensure highest levels of resistance to wear.
NEW CYLINDER HEAD
All ports and the combustion chamber have been redesigned in the OHC cylinder head of the 500 EXC's new engine. The new camshaft actuates four valves via lightweight rocker arms. High-quality titanium valves are used on the intake side. As before, the cylinder head cover mounted at an angle simplifies service work.
The 500 EXC's new, improved silencer not only offers greater volume and a new design, it also reduces noise levels to the stricter standards of the future.
The 500 EXC's newly developed clutch, with a robust steel cage and transmission-friendly back-damping, makes use of a spring washer for the first time instead of the customary conical springs, hence substantially reducing the operating force. The hydraulic actuation mechanism from Brembo® facilitates sensitive modulation of the clutch.