he was probably close but falling behind slowly, i wouldn't say keep up. when i swaped my f4i 600 with my buddy to test ride his gixxer 1000 i was easy on the throttle a little because i popped it up twice but he was still dropping further away slowly riding my f4i. but when he pulls the throttle on his bike and im riding mines, i had no chance. he owned his bike maybe for about 3 years now, so hes experienced on that bike already.

 

Iv got both 600 falls far short of the 1000 By a long shot

 

ok, in my defense... he was pulling on me the whole time but from 0-100 not near as bad cause when i looked down and saw 130 he had like 100 meters on me lol. im not retarded but to me for it being a 600 vs 1000 it was keeping up and also i read on google to put 3.5 quarts of oil in for the change and it turned out to be too much. I looked at the bubble and it read normal but a day later the lifters start ticking so i checked it and it was way over full so... too much oil = lifters ticking. sorry for the confusion. also just got me a yoshi trs

 

There's no way a 600 can keep up with 1000. I get smoked by 3rd gear by my buddies zx10.