The top-end of a GSX-R 600 is probably in the range of about 230 to 240 kmh (140 to 150 mph).
The Yamaha FZ6 has less HP than the GSX-R (98 versus 126), so it's top-end is probably a bit lower, somewhere in the range 130 to 140 mph.
But those are my best guess ... I don't know for sure. I know the top-end for my bike (what Suzuki claims, and what I've done), and there is a good 20% difference. Suzuki *claims* that my bike is capable of 235 kmh (145 mph), but even on the Autobahn, I've never had it much above 200 kmh (125 mph).
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