has anybody raced 03 z400 aginst a 05 z400 are the 05 really faster and if so how much.

 

From what I've heard the 05' are faster, by how much I don't know...but by all means it's not enought to sell your older model and buy a new one unless you really want to...just has some bigger stuff on it that you can buy and make your 03' an 05'.

 

03 = 69-71 mph stock
05 = 71-73 mph stock

 

The biggest difference I noticed was the mid-range. The 05 hits much harder in the mid-range and seems to pull harder to the top-end.

They changed the cams and valves, so I'm guessing that you could do the same for the 03. I'm sure an 03 with mods would be just as fast as a stock 05.

 

I know they are faster because I raced one when I had just a pipe and jetting and it stuck with me until 5th then I pulled a little on him.