Overview

With the development of the stunning new Ninja ZX-6R and ZX-6RR, Kawasaki makes a dramatic departure from the broad-spectrum appeal of the earlier machines, giving both bikes a much stronger track bias. As the aggressive styling of the new Sixes implies, their engines, chassis, riding positions and overall performance are oriented towards serious sports riding, track days and full-on racing.

The ZX-6R carries over the 636cc displacement (but not much else) of last year’s 6R, while the ZX-6RR is a limited production race-oriented machine equipped with special engine and chassis features for 600cc class racing.

Both bikes run new, lightweight aluminium frames with a central Ram Air duct, revised steering geometry and new sub-frames. Some of the many other advanced features include an inverted front fork, radial-mounted front brake calipers, lighter wheels and the trickest instrument package this side of a GP circuit.

The new fuel-injected engines pump out more power, have a higher rev ceiling, weigh less and are more compact. The cylinder head, valve train, cylinder, transmission, crankcases and many more components are completely new. Engine weight has been significantly reduced and performance markedly increased.

In addition to the above modifications, the ZX-6RR engine features a more over-square bore/stroke ratio for increased high-rpm performance, forged racing pistons and a back-torque limiter for the clutch. The chassis gets an adjustable swingarm pivot. An optional race kit offers a wider range of tuning parts, including a programmable ECU and tuning parts for the clutch.

Key Points

• All-new engines are more powerful, lighter and more compact
• Electronic fuel injection boosts power across the rpm range
• Valve train completely redesigned for high-rpm operation
• New close-ratio transmission
• Lightweight aluminium frame with central Ram Air duct
• Fully adjustable inverted front fork
• Radial-mounted, 4-piston front brake calipers
• Racing-type instruments include shift indicator & lap timer
• Aggressive new styling package includes LED tail light
• Kawasaki are hoping to have these machines available by December or January

ZX-6RR Special Features

• Compared with the earlier 600cc ZX-6R, the new ZX-6RR uses a more over-square bore/stroke ratio for improved performance at high rpm (66 x 43.8 -> 67 x 42.5 mm).
• 3-ring, forged pistons are fitted. Lightweight construction results in a weight reduction of approximately 5 grams
• Crankshaft re-balanced to suit changes in stroke and piston weight.
• Back-torque limiter fitted to the clutch helps prevent rear wheel hop during corner entry.
• A programmable ECU comes with the race kit, as do different springs and shims for the slipper clutch.
• Adjustable swingarm pivot allows the chassis to be tuned to suit track conditions.
• A steering damper mounting boss is fitted to the frame.