426ex

[FoxMxRiders]

I have a 01 400ex with a stock engine original piston/rings and it doesn't burn any oil :D

Here my mods :

Engine :

Uni Filter
Open Box
Choke Removed
Secret Carb modification (increase throttle response)
Yoshimura Off-road Slipon

Chassis :

Stadium Full adjustable front shocks
Lonestar +2 +4 axle
Rad Double Row Carrier
Rad Locknut

I like my 400ex and don't want to change it.Just need a more power.

I was thinking about this setup :

Je 426 13:1
Stage 2 Cam
HD Spring
Port and polish
Maybe 450R carb or a FCR41
Maybe Curtis Spark X-6 :D

Does I need something else??

[krt400ex]

i would do at least stiffer clutch springs. i would really recomend going with a full hinson setup. they r #1. otherwise everything looks good. oh, and u might want to go with a rev box. post some pics when ur all done

[FoxMxRiders]

Yeah I forget the Rev box :p

anyway this winter I will tear all the quad apart and the motor to remplace fews pieces.I will buy a CRF Cam chain and some other things!!I will see for the clutch but now it doesn't slip at all!!

[brapbrap13]

Originally posted by FoxMxRiders
Yeah I forget the Rev box :p

anyway this winter I will tear all the quad apart and the motor to remplace fews pieces.I will buy a CRF Cam chain and some other things!!I will see for the clutch but now it doesn't slip at all!!



instead of just a crf chain, grab a crf motor :D

[FoxMxRiders]

I can have one,my friend Father have one with all the thing to swap it but man it's a hard work to make it fit and I don't want to cut my frame :(

[krt400ex]

Originally posted by FoxMxRiders
Yeah I forget the Rev box :p

anyway this winter I will tear all the quad apart and the motor to remplace fews pieces.I will buy a CRF Cam chain and some other things!!I will see for the clutch but now it doesn't slip at all!!

if u slip ur clutch alot then u will def. need stronger clutch springs. if u don't slip it much then u'll prolly be fine. be aware that with that much more power then ur clutch might give out on a hot day

[GPracer2500]

I wouldn't run a stock rod with that much compression. 13:1 is a lot in an EX.

Also, what's your "secret" carb mod...come on man--spill it!! :)

[FoxMxRiders]

Yeah I was thinking the same ... 13:1 with the stock rod that's a lot

And for the carb mod ... I can't :p sorry :(

[Wheelie]

If you plan on running 13:1 comp, a HD rod will be needed. While the crank is out, why not stroke it to a 450?

[ride_red666]

get a cdi instead of a rev box, it increases the rev as well as throttle response

[redexrider]

isn't the "rev box" the same thing as a CDI box?? I bought my CDI box which contains the rev limiter circuit in it, hence Rev box. I am not positive on this, but I thouht it was the same thing...

[GPracer2500]

Originally posted by redexrider
isn't the "rev box" the same thing as a CDI box?? I bought my CDI box which contains the rev limiter circuit in it, hence Rev box. I am not positive on this, but I thouht it was the same thing...

Yes, on a 400EX they are the same thing. The rev limit is a function of the CDI not a separate component. I'm not aware of any add-on boxes that change the way the CDI functions, only replacements for the whole CDI.