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born2ridefree
05-29-2005, 06:27 PM
I'm going to be buying either a brand new 400ex or a relativly new 400ex in the next couple of weeks. I was just wondering what kind of mods i should do to it to get the best performance out of it. I will be doing mostly trails and mud. any input would be greatly appreciated thank you in advance.

bonified5
05-29-2005, 07:01 PM
As always.....pipe jetting and filter.

FoxMxRiders
05-29-2005, 10:06 PM
yeah,pipe/filter and jetting is basic thing

after that you have,more compression piston,cam,porting,polish etc