Welcome to the site :cool:
Be sure and go to your User CP and update information relating to your location, type of riding, etc. After that grab a spot on the couch and tell us a bit about yourself. How long you have been riding, what kind of riding you prefer, where you are located, etc. We will do our best to hook you up with some fellow dirt bike enthusiasts.
Regarding your question ... If I am correct, your KX is a 2 stroke, so I would suggest that you check out
CR / KX / RM / YZ (2-Stroke) Discussion and/or
General Bike Repair forums for suggestions.
Again, welcome to the site and shout if you have any questions!