Hello all.

I am thinking about putting a 426 Kit in my 2001 400EX. I had a couple questions to make sure I do this right...

The parts I am going to order are:

11:1 426cc Wiseco piston
Namura 440 89mm top end gasket kit
Stage 2 HOTCAMS cam

1) I guess my first question is what jet kit should I get? I've been doing some checking and I'm not sure if the DynoJet stage 1/2 kit is what I need.

2) Is there any reason to re-sleeve the cylinder? I know 426cc is the most it can be bored out. What about replacing/stiffening the valve springs and rocker arms?

3) Also, what rev/cdi box should I get? I've been reading these forums and most people say to stay away from the WB and go with a TC or a GT Thunder, but I can't find them online to purchase!

Any information would be appreciated.

 

i have a 2001 400ex tryin to biuld a 440 what is the best piston brand to go with ?
and what stage 2 cam to use how are web cams, hot rod cams? or is it better to go with the 460 stroker kit and can you use stage 2 gam?

 

iam was thinking of building a 426 but iwas told to go with a 440 kit so let us know how your 426 works out