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bigH
06-23-2006, 04:05 PM
hello everybody i got a 05 400ex n i am in love with it.....its all stock....i wanna not what should i get 2 make it faster n beat my friends stock kfx 400....he doesn't pull away from me n the race usually goes either way since his tires r wnot ne good but i wanna no how n what should i do 2 be able 2 pull away from him.....should i get a jet kit, a pipe n what kind?, what tires should i get....i'd rele appreiciate if u would give me some advice thank u alot :D
theTman
06-23-2006, 04:17 PM
pipe, air filter
bigH
06-23-2006, 04:21 PM
Originally posted by theTman
pipe, air filter

alright no jet kit or ne thing....whats the best pipe 4 me 2 get....prolly get the k & n air filter right?
GPracer2500
06-23-2006, 04:29 PM
UNI is a good filter. If you install a pipe and aftermarket air filter you will want to rejet your carburetor. You don't have to buy a jet kit to do that though. You can buy individual jets that are the same as the factory jets already in there, just different sizes.

Changing the front sprocket to one size smaller is a popular mod that will help with dragracing (but sacrifices top speed a little).
bigH
06-23-2006, 04:45 PM
Originally posted by GPracer2500
UNI is a good filter. If you install a pipe and aftermarket air filter you will want to rejet your carburetor. You don't have to buy a jet kit to do that though. You can buy individual jets that are the same as the factory jets already in there, just different sizes.

Changing the front sprocket to one size smaller is a popular mod that will help with dragracing (but sacrifices top speed a little).

thanks alot buddy how much will change the front sprocket effect the top end i just wanna beat the kfx by a couple of lengths sine he chooses 2 not changing ne thing on he is.
GPracer2500
06-23-2006, 04:51 PM
It'll knock around 5 mph off your theoretical top speed.
bigH
06-23-2006, 04:59 PM
do u no any good full exhaust systems 2 increase some speed
GPracer2500
06-23-2006, 05:05 PM
Try the search feature. There's lots of info and opinions on exhaust.
bigH
06-23-2006, 05:10 PM
Originally posted by GPracer2500
Try the search feature. There's lots of info and opinions on exhaust.

alright thanks i'm mostly like gonna get a yosihmura
bigbearkid4x4
06-23-2006, 06:55 PM
yoshimura is a good choice i jsut got mine wednesday from www.rockymountainatvmc.com for 395 shipped
bigH
06-23-2006, 07:34 PM
Originally posted by bigbearkid4x4
yoshimura is a good choice i jsut got mine wednesday from www.rockymountainatvmc.com for 395 shipped

hey man thanks 4 the site its a full exhaust system right lol thats rele a good deal......did it make a difference in speed?
krt400ex
06-23-2006, 10:10 PM
Originally posted by bigH
hey man thanks 4 the site its a full exhaust system right lol thats rele a good deal......did it make a difference in speed?

a pipe wont make a diff in speed, it will only get u where u got to go faster. when ur bike is making more power it could handle taller gearing and that would increase ur top speed. going up one or two teeth on ur front sprocket is a good way to achieve this, but u'd have to get a pipe too
400exstud
06-23-2006, 11:13 PM
Yoshi is a good pipe.

I went with HMF after a lot of searching and can't complain about it. It does everything that I expected from it and sounds wicked.
bigH
06-24-2006, 11:23 AM
Originally posted by 400exstud
Yoshi is a good pipe.

I went with HMF after a lot of searching and can't complain about it. It does everything that I expected from it and sounds wicked.

do u notice ne difference with the pipe like in performance or ne thing.....i just want 2 make the right descion