Not really, check some reputable stats, you'll see 03-04 RR weighs more than F4-F4i. Just because it's new, doesn't mean it's lighter. RR achieves greater cornering prowess through other means. RR is also peakier, but it's a bit abrupt with EFI on 03-04 compared to F4i and F4 (carbs were still the smoothest during EFI's earlier stage). And then '05-06 600RR is significantly different from 03-04, I have no idea what the wet weight of 05-06 is, but I am guessing it's still around 430ish pounds. The F4s will have more usable midrange for street. Newer doesn't mean it's better every way, but it's better most ways for the track. Although it's one of those little nits most of us wouldn't notice, but when you're making a pitch, it's important to say in comparative context.JBaz said:if your new to bikes, you won't know the difference. The performance is much better on the RR, it can corner easier and a lot smoother than the F4. The F4 weights more as well.