any of you with an 09 kx 450 need to check your throttle bodies, there is a lot number on the left side, the eligible lot numbers are:
0140AZFW
0140AZFX
0140AZFY
0140AZFZ
the lip on the back side of the spigot can break off and end up in the motor, mine was one of the recalled units, when I removed the rubber boot from the air box, part of the throttle body stayed in the air boot. It only took about a week to get the new one and I think it was the early production units that had these, mine was the only one my dealer had that needed the update.