The eight-valve, liquid-cooled, parallel-twin-cylinder engine offers a
well-proportioned balance of physical size and willing, enjoyable power output,
with an energetic, high-revving character and capable top-end performance. Already strong off the bottom, this year development focused on faster
acceleration through a boost in low-to-mid-range power and torque in the 3,000
to 7,000rpm range. Feeding the PGM-FI fuel injection is now a straight shot of airflow through
the airbox and throttle bodies.The battery has been repositioned further away from the rear of the airbox
intake duct to allow greater airflow.
The exhaust muffler now features dual exit pipes, adding a sportier-sounding
edge to each pulse. Peak power arrives at 8,500 rpm, with maximum torque
delivered at 7,000 rpm.
The primary couple-balancer sits behind the cylinders, close to the bike’s
centre of gravity. The primary and balancer gears use scissor gears, reducing
The crank counterweight is specifically shaped for couple-balance is light to
allow the engine to spin freely, with reduced inertia.
A six-speed gearbox mirrors that of the RR and uses the same gear-change arm
structure and link mechanism.
An assist/slipper clutch enables lighter upshifts and smoother
The engine complements the frame’s rigidity with four frame hangers on the
Internally, the cylinder head uses roller-rocker arms; shim-type valve
adjustment allows them to be light, for lower valve-spring load and reduced
friction. A silent cam chain has the surface of its pins treated with Vanadium,
reducing friction with increased protection against wear.