I got a 07 400ex last Sept. I have masterd it on the trail and track. I'm looking to find out where I can get upgrade kits or the right mixture to get some more ummp out of her. Found alot of different stuff on line but not quite what I'm looking for. I want a slip on and jet kit and cdi but just don't know how to match them up for max performance. Oh I forgot I'm poor. [img]i/expressions/face-icon-small-happy.gif[/img]

 

`i got off of e-bay a power kit for my 2001 400ex and it had with it a HMF slip-on, the proper jets, dynatek cdi box, and a k&n air filter for $359, and i also got a new chain and sprocket with 14 tooth front, and 38 tooth rear. i got that chain and sprocket already getting the power kit monday so i'll let you know the power improvement

 

on mine i have a fmf slip on, fmf jet kit, and want a white bros or yoshi cdi. and also if you want more acceleration get some differant sprockets and stuff.

 

I have a white bros slip on, dynatek cdi, and uni filter and it does make a differance, it does alot better in drags, i tried changing the front sprocket smaller to get more power but, that didn't work to well.

 

Thanks guys,
I orderd a hmf slip on quad sport series and a stage 2 dyno jet kit. Hopefully we'll finsd out whats up this weekend. Thanks again.

 

i just got my hmf slipon jet kit new front and rear sprocket and chain and k&n air filter, and cdi box, and installed them and its a BEAST...can't wait to get her on the trails and ride....rode up and down the street and she was mean, i noticed the improvements from all the aftermarket parts, and i'm in love....also changed spark plug, and changed oil...let me know how your HMF pipe works....made me think of my old crf450 with yoshi slipon on it...sounds so mean

 

just put on my hmf pipe and dyno jet kit and it did come to life. only one problem though, it smells and runs rich and i can't find any fuel/air mixture screw on my 07 400ex. anybody have any ideas.

 

never mind i found it and it's a new machine, can't wait to take it to the track.