Honda 400ex more power

5 posts in this topic

hey everyone,

i have a 400ex with fmf power core exaust, k&n air filter, jetted, and eliminated the airbox.

i need more out of her. what should i get?

440 big bore


i mostly ride the dunes and fast trail riding.

thanx for the help.


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Agreed, also, a cam upgrade,higher compression, port work and a bigger carb will go nicely with the added displacement.

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sprocket size changes will give you more grunt in the lower end but you will lose top end speed ... or vise versa depending on the sizes you use ..and its cheap ...

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