2009 Kawasaki ZX-6R

To truly push the envelope, a rider needs a calm yet responsive sportbike with precision control feel and confidence-inspiring manners. That machine is perfectly embodied by the new 2009 Ninja® ZX™-6R. Thanks to an extensive overhaul by the Kawasaki engineers; weight shaving, improving mass centralization, refining engine and chassis behavior, adding a revolutionary front fork design; the new leaner, more precise Ninja ZX-6R delivers the elusive calm and confident handling that top racers need.

Fine-tuning the chassis and tightening its mass centralization resulted in lighter handling to make it even easier to tip this ZX-6R into a corner. To optimize front-rear rigidity balance, the engineers revised frame stiffness around the swingarm pivot and the rear engine mounts. The engine was rotated around the output shaft to offer a steeper cylinder bank angle and raise its CG by 16mm. A new exhaust layout with a short side muffler lowers the weight previously located under the seat and an exhaust pre-chamber further contributes to the new ZX-6R's mass centralization.

The new Ninja ZX-6R's leaner physique is fundamental to its lighter handling. Both the engine and chassis were evaluated to reduce weight. The intake resonator box and supports for the instrument panel and mirrors are now unitized with the enlarged -to optimize intake volume - Ram Air duct, contributing to weight savings and improving rigidity. New camshafts are now made of lighter SCM, and lightweight magnesium replaces aluminum for the engine covers. Revised internal gears - transmission, oil pump and starter - are lighter without compromising strength. Adjusting several mounting plates and the coolant reservoir locations helped shave additional weight.

Handling wasn't the only area of improvement on the new Ninja ZX-6R; its lighter engine received a host of changes focused on delivering precise throttle control and increased performance, particularly in the mid-range. A smoother power delivery was achieved through better combustion efficiency. The changes include; adding cylindrical guides to the top of the airbox to better guide the fuel charge into the intake funnels, increasing the distance between the main and sub-throttles by 10mm to reduce inlet turbulence, revised cylinder porting to improve cylinder filling and increasing secondary coil current in the ignition coils.

In addition to healthier bottom-end torque and smoother throttle response, the engine's mid-range performance was increased via a similar number of refinements, including; new double-bore velocity stacks with inlets at two different heights, pistons with new profiles and improved crown finishing, and reduced mechanical loss by decreasing piston ring tension and revising the cam chain guides to better stabilize the motion of the chain. A new exhaust collector layout rounds out the major changes.

The stronger mid-range torque provides greater drive out of corners and is harmonized with the engine's silky smooth high-rpm performance. This linear throttle torque delivery results in improved controllability and offers the rider more precise throttle control at all rpm. This predictability pays dividends when making mid-corner power adjustments. When combined with the reduced need to downshift provided by its healthy mid-range performance, the predictable throttle response makes it easier for riders to maintain their rhythm when stringing corners together.

In keeping with its racing heritage, the ZX-6R employs a cassette-type transmission that simplifies gearing changes at the track, reducing set-up time and allowing more time for riding. A slipper clutch allows quick downshifts without upsetting the rest of the chassis when reducing speed on corner entry.