Last year, on the 1987 bike, I had some direct comparisons (ie friendly races) with a 2003 GSXR600 and a 636 Ninja. From a rolling start it was pretty close with both bikes. Up to about 100 I only had a few bike lengths on them. After that, the torque (i guess) played into the equation more because I walked them easily before backing off around 140. My 1992 has some mods, so it easily takes any 600.