400ex upgrades piston, cam, etc
#1
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i have a 01' 400ex and i need to replace the piston rings...i figured while i was in there i would do some upgrades....thought about an 11:1 stock bore wiseco piston and a cam...either the white brothers all around or hotcams stage 2....also plan on replacing the header pipe with an fmf (hi flo or power bomb)....thought about a 440 kit but i want to remain reliable and don't want to spend that kind of $$$.....
it already has a white brothers e-series slip on, rev box, k&n, and jet....i mainly ride trail and track in the midwest
the question is....is anybody running this set up or something similar??...and how do you like it???
it already has a white brothers e-series slip on, rev box, k&n, and jet....i mainly ride trail and track in the midwest
the question is....is anybody running this set up or something similar??...and how do you like it???
#2
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If you go with 11:1 I would go with a 426 ROSS or JE piston with Hot Cam 2 . I had a 426 all this year on mine and loved it.Also porting will be a nice enhancement.the Cost wasnt that much different and a 440 can be as equally reliable if you do the job right the first time and it runs cooler.....
I decided to go a new route and do a 12:1 Full Duncan 440 kit this time with a 450R carb . either way I have a jug for both and Ill have my 426 if I ever needed to fall back on it, butanyhow, if your mods are done right you will be very pleased...[img]i/expressions/face-icon-small-smile.gif[/img]
Tina
I decided to go a new route and do a 12:1 Full Duncan 440 kit this time with a 450R carb . either way I have a jug for both and Ill have my 426 if I ever needed to fall back on it, butanyhow, if your mods are done right you will be very pleased...[img]i/expressions/face-icon-small-smile.gif[/img]
Tina
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#9
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The link below was from an earlier atvconnections forum post (my http link above didn't have the correct text [img]i/expressions/face-icon-small-sad.gif[/img] The page includes dynos comparing the 450r carb on a 400ex (it is actually a 416, but the gains should be relevant?). A 4hp increase is shown with the upgraded carb:
http://www.trx450r.org/forum/index.p...=4150&hl=400ex
The original atvforums thread is here:
http://forums.atvconnection.com/mess...did/438399.cfm
http://www.trx450r.org/forum/index.p...=4150&hl=400ex
The original atvforums thread is here:
http://forums.atvconnection.com/mess...did/438399.cfm
#10