need help on new bike an want to put in new parts

[trx400 rider]

I just got a 2000 trx400exand want to make it go faster. I know the last owner put .40 piston in what cc would that make the bike?

[tyman2395]

407 i'm pretty sure

[trx400 rider]

ok thanks do you know what i should put in it to keep up with my buddies ltr450 i already have a pipe and the .40 piston k&n air filter

[tyman2395]

and to make it faster you can put a 16 front sprocket and 36 back and to add better throttle response i would add a pipe, an air filter, 450r carb, a hotcam, and stuff like that

[tyman2395]

and a rev box can make it faster. also put and outerwears pre-filter on the k&n and take the airbox lid off for better throttle response cuz better throttle response will get you to the top speed quicker

[trx400 rider]

do you know any good websites i could find that i been lookin at rocky mountain ATV.com

[tyman2395]

and cant forget for more power the curtis sparks timing advance key plus all tghe other parts will add power to

[tyman2395]

i get all my stuff of ebay but if you dont have faith in ebay heres a site with good prices i will pm you it

[trx400 rider]

Im new with this website how do u pm

[tyman2395]

i sent you a personal message now you go to messages on the top of the page

[trx400 rider]

should i get the Boyesen Powerwing carb. or go with a fmf jet kit

[tyman2395]

i would just get the stock 450r carb

[trx400 rider]

ok and for the rev box should i get a big gun or a Magnum

[tyman2395]

i hear alot of good stuff about big gun never heard of magnum

[trx400 rider]

ok they dont have stock 450 carb. on that website

[tyman2395]

no you gotta check craiglist or something like ebay for a used one

[trx400 rider]

cant i get a new stock one

[tyman2395]

ya but you will be paying alot

i'll lead you down a better way to get faster...suspension...

the stock suspension on the 400ex does not handle the stock power of the 400ex motor all that well. it don't allow the power to be put to the ground or to keep it going in the direction that you want it to go.

i guarantee if you upgrade your suspension, you will be faster with the same performance set up that you have now.

so, first things first...

get a steering stabilizer. if you don't plan on racing, a non rebuildable stick style would be good enough. next you should send your rear shock to gt thunder for a re-valve to go with his rear linkage. it will eliminate that buck that rear end has. it will also make the rear end plant more and keep the front end down on hard acceleration.

front shocks would be next...options are limited only by your wallet. if you want to keep it on the cheap side, get a set of 450r fronts and have gt thunder re-valve them also. there will be a world of difference.

so now, with the new suspension, your rear is not bouncing around, but staying planted and keeping you moving forward. your fronts are staying planted instead of being off the ground. all this allows your tires to help you turn better.

since i mentioned tires, the stock ones are good, but there are better. i won't even go into detail on this...i like razr2 up front and am currently running irazrs in the rear...i like the fronts a lot and thought the irazrs was one of the best tires i have had, but the wear on the irazr leaves a lot to be desired...they just wear way too fast

[trx400 rider]

ok thanks