Hello, new here and bought my '95 KDX about a year ago. Ran OK and was in good shape when I bought it. I recently did several upgrades after researching on this forum. Put on Pro-Circuit Platinum 2 pipe, 304 silencer, went to 42 pilot, 152 main, 1173 needle in second clip from top and air screw 2 turns out right now. Bike absolutely rips now! It sounds much better, will lift the front wheel through 3rd gear easily and has quite a "hit" to it in the lower midrange. For any of you wondering about the Platinum 2 pipe it provides a big boost in power from the lower midrange to the top end. It does have quite a hard "hit" to it though. It will lift the front wheel when it comes on the pipe even if your holding the throttle steady. It has a bark to it similar to my KX250 when you give it a little clutch. Throttle response is much crisper. I forgot to mention, also put in Boyeson 607 reeds. Only minor problem is that the bike still is just a little rich at about 1/4 throttle. Any suggestions? Should I try the 1172 needle at sea level and 80 degrees in Illinois? Thanks to all for the good imformation here.