Some people may think me posting this is dumb, but i thought it was very interesting. My street plated uncorked 00 xr650r vs 01 yz426f vs 1995 cr500. It was a sweet dirt drag of 3 of the best bikes ever. So off the line I (xr650r) started in second gear and got a bike lenght on both. The 426 and 500 were almost equal in acceleration. They both pulled next to me until 70-80mph i drove away. So the pig held up pretty well. Neither of then was able to pass in accleration (becasue of my bike lenght i got ahead of the line), but i would say the bikes are all pretty close in straight up acceleration. YEA. Also the yz426f was like new, the cr500 was fresh, and the xr650 was uncorked. We all have rode since we were little. all very good riders.