i know the z400 is faster. i want to know what i have to add to my 07 400ex to be faster than a stock z400. thanks

 

some of that funny gas ,maybe a 20 shot

 

A CRF450R motor.
On a more serious note, we pretty much answered this question in your last post, titled "400ex performance"

 

yeah, i'm just wondering the minimum

 

My EX has the basic mods I listed in your other post, yet fifth gear pinned down a desert wash a stock Z will slowly walk away from me. The EX has the advantage in low end torque, and the Z has the advantage on the top end. Do lots of tight trail riding if you want to beat the Z.

 

THE Z IS FASTER. I HAVE A 400 W/ EXHAUST JET AND AIRBOX LID OFF AND A COMPLETELY STOCK Z WILL PULL ALL DAY. I THINK IF YOU GET A GOOD HOLESHOT IT WOULD BE CLOSE BUT IF HE JUMPS ON YOU ITS ALL OVER. UNLESS HE MISSES A GEAR.

 

yeah or you could distract him by pointing at his quad just be for the the start ,wile he looking ,your gone. [img]i/expressions/face-icon-small-smile.gif[/img]

 

z400 has too much top end for the 400ex

 

A 440 kit and a FCR 39. You will eat them alive!

 

It makes no sense to try and do extreme performance mods on the low end machines anyway. Sure, years ago when a 400 was the top of the line it made sense, but now with 450-700cc machines out there, one should trade up to something bigger and not sacrifice reliability by tearing into a prefectly good engine!