The speed difference won't be as big as you think... I had a go on a 01 600F4i and I was impressed at how good it was for what was supposed to be an 'old bike'. They do feel heavier but powerwise there's not THAT much in it. You'd get a bigger shock going from a 600 to a 750 from the same vintage, and even that is not much really. Older 600s also have a much more forgiving powerband which the new R6 definitely does not have... hahaha but it rewards the skillful.
Having said that, make no mistake, newer models are faster. Definitely.
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