I am not sure of the top speed.....but i have gone 157 kinda on accident. Its scary fast!!! Mine has racing cam, drag gears, oversize sprocket, exhaust. Its pretty much set up for drag racing...but if i having gone 157 on this bike with a drag set up.....i have no idea of what the top speed is. My bike was still screaming to let me open it up at 157..but that is just scary fast!! Someone wrote a review and said that it was faster than a busa in the lower gears...he is right. I am not sure the exact weight but it does feel a bit lighter than the new gsxr 1000. this bikes balance is just so awsome due to the amazing suspension set up!!!! That may make it ´feel´ lighter as well. I would definitaly recomend this bike to anyone!!