will an xr250s cam work on a 400ex to give it more horse?
and what about the cdi box to?
ive heard this to be true from many people and i just wanted another good opinion or some fact from someone who has actually seen it done or had it done

 

why dont you just go with a hotcam?
If you install it yourself it is only about $200.

 

cause I can get an xr250 cam for like 20 bucks same with the cdi unit
i work for a salvage company