Time to wake up the old 400ex

[ONEslowEXer]

looking to bring some life to my 400ex thinkin bout JE 416 kit and stage 2 cam...i all I have now is big gun full exhaust K&N no air box cover and dyno jet kit and input would be great ive seen alot of project 400's out there thanks randy

[500ex]

bigger valves and have the head ported by someone who knows what there doing,not joe blow shadetree mechanic.You can make it run worse if you just hog it out with a dremel.

[450R_Matt]

Hey Randy. Talk to Jeff the guy I told you about that will fix the works shocks. He also builds motors. His shop name is X-Treme. He dosnt do the machine work himself he sends it off to Trinity. Takes a little longer but thats my sugestion here local.   Not sure about Trinity but maybe someone else will have a sugestion.  

[L.E._YFZ_2005]

take it to Atp  have mike do his 416 kit on it  from what i see the 416 is a crazy  insane bike if i could of gone back i probly would do the 416 insteadof the 440.  

[Hollywood]

The 416 is a good choice as well as ATP. With the right combination of parts it can be made to run with just about anything out there.   I do think I might would go to a 426 if I had it to do again though.