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View Full Version : Best performance Changes for 400ex


Quaddog3
07-10-2006, 02:03 PM
Ive been serching the threads but all upgrades refer to 440's 450's 416's etc.

What would be a good mod on a std 400ex for better acceleration.
It already has a WB Eseries exhaust and an over rev. but I need to get out of the gate a little quicker.

Cheers n beers.
Wheelie
07-10-2006, 02:17 PM
K&N Filter, remove airbox lid and choke, and rejet.

Dropping one tooth on the front sprocket is also a popular mod.
Quaddog3
07-10-2006, 02:26 PM
Many thanks.:)
<DRS>GPF
07-10-2006, 05:37 PM
if your really looking to squeeze out all you can with stock, you can grind down the weld seam on the inside of the headpipe..
miller821
07-10-2006, 06:25 PM
Originally posted by Wheelie
Dropping one tooth on the front sprocket is also a popular mod.

This mod helped me out a ton on bottom end.
400exstud
07-11-2006, 10:02 AM
A 450R motor
swva400ex
07-11-2006, 10:05 AM
cam
AR15 guy
07-11-2006, 10:14 AM
Basically any mod that will add power to a 416, 426, 440, 460 ect will also make more power on a standard 400ex.
ohsobad_chevy
07-11-2006, 12:37 PM
Originally posted by 400exstud
A 450R motor

Anyone else hate smart aass comments like this?? :ermm:
PismoLocal
07-11-2006, 12:45 PM
Originally posted by ohsobad_chevy
Anyone else hate smart aass comments like this?? :ermm:
yep :mad:
swva400ex
07-11-2006, 12:51 PM
i second
400exstud
07-11-2006, 02:16 PM
It is infact true.

You can find a slightly used 450R motor on ebay, sell your 400ex motor, and only be out a few hundred bucks. This alone wil give you as much if not more than a piped, big bore, cammed, bla bla blaed 400ex motor, with more reliability, and with more potential.

It has already been done to numerous bikes and is proving to be worth while to those that have dumped loads of cash into their 400ex chassis and just can't afford to part with it.

;)
Quaddog3
07-11-2006, 02:17 PM
A mate has a 440 kit so will probably go that route and drop a tooth if needed, also K&N and take off the lid.

Thanks for the help, inc the 450 comment:D
400exstud
07-11-2006, 02:30 PM
For your viewing pleasure

http://www.exriders.com/vbb/showthread.php?s=&threadid=227736
ELewandowski
07-11-2006, 03:08 PM
I would go with the new front sprocket. Makes a huge difference on a stock 400ex. And its cheap.