I would try stepping down on your pilot,50,or 48,put the needle clip back to the original groove.Then after you get the closed to 1/4 throttle jetted right,then see if it is rich in the middle(needle clip position).After that see how it runs up top (MAIN JET).Do not go by my bike but,I have the ss reeds in my 00 kx 250, pump fuel.I had to step down from a 160 main to a 158.The pilot can afford to go down 1 on mine,but I like it a little fat on the bottom.Stock needle position on mine.Your power jet should have came with a 48. on the 01