I got this JD jet kit on eBay. All my other jets are the same, but I’m using the Blue @ #3 for summer riding. I assume that during the winter I’ll need to got to Red @ #4.
The range of places I ride vary between 700 and 1000 feet in elevation.
During the summer, the below jetting was a little rich, but during the winter months it is nearly perfect. This jetting is for a AirStriker carb using a KX airbox (the KDX 200 motor is in a KX frame).
DEK needle, 2nd clip from top
40 slow jet
155 main jet
Based on year and temp, air screw anywhere from 1 to 1 1/2 turns outs.