what are the best jets or jet kit for a stock 400 ex and what is the best way to get more speed with sprockets without losing to mush power and who makes the best cam for a 400

 

All jet are the same. They serve the same pupose... If you want some more top speed with out loosing to much low end. Go down 2-3 teeth on the back sprocket, and i have heard good things about hot cams and web cams for the 400ex.