Honda didn’t really need to tweak the 107bhp, in-line-four-cylinder 599cc motor as it’s a gem in the first place, with a powerful, screaming top-end and a decent dollop of mid-range. The engine is especially effective at delivering incredible performance, thanks to the Honda’s lack of all-up weight (it’s the lightest of all the 600s). The Honda CBR600RR’s motor is already more flexible than the ’08 Kawasaki ZX-6R, Suzuki GSX-R600 K8 and ’08 Yamaha R6, but the tweaks to the engine and exhaust have made it even nicer to live with.