2024 Kawasaki ZX-6R first ride review: reborn 600 supersport screamer tested on UK roads

Showa BFF-SF fork (Balance Free Fork-Separate Function) are a touch dated compared with the best non-electronic suspension, let alone the cream of semi-active suspension, and the Showa shock at the rear is nothing special either. They’re the same parts as the last UK model, and from experience we’ve no doubts they’ll do a decent enough job on a track.

But their single-minded setup is a pronounced limitation on our winter road test: warm, sunny conditions will help a little, but it’s firmly sprung and damped, and your wrists/spine will take a battering unless you start hitting big speeds and generate the load to get the suspension moving, rather than jarring.

That’s no real surprise, it’s built for aggressive cornering: lots of brakes, trailed deep while maintaining as much apex speed as possible, and getting the motor screaming again exiting the bend.

Track riding, again: you might find smooth, quiet stretches where you can really tap into that capability once in a blue moon, but you won’t get the best out of it in the UK very often, and you’d probably appreciate a bike in its performance window at lower speeds much of the time. Again, it’s designed that way so it’s hard to be critical, but it will be a limitation.

It comes on Pirelli Diablo Rosso IV – a welcome change from the obscure, cost-cutting fitments that came on many Japanese 600s. They’re a decent sporty road tyre that’ll handle cooler conditions through to moderate track use, which suits the ZX-6R perfectly.

It’s well-appointed in the braking stakes, too – Nissin radial four-pots don’t look much, but the feel, power modulation and outright stopping are as good as you’ll ever need. There’s a relatively simple ABS system, but the firm forks, decent tyre and good lever feel minimise the amount you’ll call on it.

Don’t enjoy thrashing a bike? Then keep walking. The 636cc iterations of the ZX-6R have always offered more response low down than its 599cc rivals, but it’s all relative: a simple 1mm overbore on a ‘true’ 600 doesn’t suddenly make it a torque monster.

The 599cc model is no longer sold, even for racing, with Supersport race regs tweaked with a balancing factor to make the disparate models on offer (the 599cc CBR600RR, the 765cc Triumph Street Triple RS and the 955cc Ducati Panigale V2 as well the Kawasaki).

The ZX-6R’s drive off the bottom is minimal until 4000rpm, where it perks up and gets going, rapidly building engine speed and hitting its prime at 13,000rpm, although the days of 600s head-banging their way to 15,000rpm or more are long gone: the new camshafts, headers and intake slow the top-end rush, and while it will rev out, it doesn’t do so in the same aggressive, addictive manner.

Yet, it doesn’t feel slow, and scrutinising both our dyno and speed test figures reveals why. It hits a top speed of ‘only’ 144mph (measured on a datalogger) but does so with ease, and more or less hits a brickwall. We’d expect a 600 to clear 150mph, based on the best figures from the class in its prime about 15 years ago.

Our first thought was that it’s now restricted at high rpm, but cross-referencing the dyno chart reveals it has no issue with revving out in sixth, and makes the same power (115bhp at the rear wheel) as it does in the lower gears, suggesting it’s geared unusually low for a production bike. Gearing is shorter than it might have once been: why, only Kawasaki knows (it may help with meeting noise/emissions standards at fixed speed/rpm, or it could just be to maximise enjoyment), but it’s a welcome change.

It’s a touch revvy at cruising speed, but it’ll hold a higher gear than you might imagine, and it’ll suit the UK’s nadgery parkland circuits really well, too. As an experiment, we tried taking off in sixth. It managed it… an astounding, if useless achievement for a 600…

The TFT screen and new fairing have a modern, quality feel, and the main chassis and running gear is a cut above bikes like the Aprilia RS660, Yamaha R7 and other more budget-friendly middleweight sportsbikes. Even Kawasaki’s own ZX-4RR is built to a lower standard, though it also £2000 cheaper.

Certain components and fittings will appear cheap next to the our favourite mid-class sports machine, the Street Triple 765 RS, which has top-notch finish as well as high-end componentry for not much more cash.

Reliability shouldn’t be an issue, as the engine is 11 years old if you trace it back to the first modern 636, with roots that trace back 15 years, with less propensity for high revs and the stresses that come with pinging a 600 off the rev limiter. We’d expect ZX-6R life to be trouble-free.

Fuel economy is surprisingly poor – even a wet, cold period during our test that fully curbed our enthusiasm didn’t see mpg rise into the 40s, and any kind of brisk riding saw it plummet to the 32-33mpg mark. That’s something of a surprise, as 600s of old were reasonably efficient if ridden sensibly.

The lightweight ZX-6R with its flat torque delivery should be easier on tyres, chains and brakes than the more popular open-class sportsbikes, unless you get hooked on trackdays, which is a distinct possibly… £10,599 is thoroughly reasonable, sitting neatly between the lower-spec budget middleweights, and the premium-spec middleweight nakeds like the Triumph Street Triple 765 RS, Yamaha MT-09 SP.

At the time of writing only the KTM 890 Duke R offered better value (with an identical RRP), but stocks are limited, and there’ll no doubt be a 990 Duke R on the way at a higher price point before long…

The price of the 2024 Honda CBR600RR is yet to be announced: the Honda is higher spec with ride-by-wire, IMU electronics and the like. We’re interested to see how that fits in to the disparate options for a sports middleweight in 2024.

Mid-spec, functional if not exceptional broadly covers the ZX-6R’s spec sheet. The hardware side is a legacy from previous editions, with no change to suspension or brake components (save for brake discs switching from petal-shaped rotors to conventional type).

There’s no Öhlins or Brembo bling, nor does it have super-sophisticated electronics, heated grips or cruise control. It’s a high-performance 600 that gets on with the job of speed: fine for some, although others may feel it’s a little behind the times with little beyond new-for-2024 TFT dash with Bluetooth functionality that really says it’s a bike of 2024.

The accessories list is basic: a road-legal Akrapoviç silencer, pillion seat replacement cowl, crash protectors and an Öhlins steering damper are the most notable. We’d expect a KRT edition to be offered at some point, which will likely include the cowl and silencer as standard for a small premium, as Kawasaki have done with other sports models like the ZX-10R.