Any 600 sportbike from the past three years will run 10s stock with the right rider. Even with an average rider and a passenger, from a roll, you should have been looking at the back of the bike. The F4i is the newest CBR and it is faster than the F4 from a roll. The difference between the F4 and the F4i, is that the F4i is fuel injected instead of carbarated.
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