FFS, read what your posting guys, that old GSXR400 was one of the first 400 sport bikes on the market, in its day it couldnt even run with the old RZ350's. What the hell are you going on about these modern 400's for? Thats like agreeing that a modern ZXR636 can give a GSXR750 a run for its money so a old GPz550 should be able to as well A 125 mito or Aprilia RS25 would smoke one of those old GSXR400's no question at all, and thats what we were talking about.