While the engine is new, it does retain the same 67 x 42.5 bore and stroke dimensions as before. Interestingly this is identical to Honda's CBR600RR and Yamaha’s latest YZF-R6. Yamaha did have a different bore and stroke previously but have gone with the consensus for their all new 2006 model. Kawasaki's ZX-6RR also utilises those exact dimensions which means that all four Japanese middleweights produce their 599.4cc in exactly the same way. Spooky huh?
