In the 450cc motocross game, the only thing that matters to serious racers is top-tier performance and running up front. And for 2011, the best tool for the job is once again a green one Kawasakis reworked and revised KX™450F. In this arena you cant stand still technically, which is why Kawasaki engineers scrutinized every system and component of the race-winning 2010 model and came up with a host of tweaks thatll have red, blue, orange and yellow wondering what hit em