Jsnake I use boyesen ss stock reeds,I was getting a little sputtering up top pump fuel,I went from a 160 to a 158,and it cleaned it right up.I would start from the pilot and work my way up.If you are fine up to 3/4 GO FOR THE 158.1 STEP AT A TIME. Watch out for oem reeds on the kx.I was eating them up on my 00 in 2 hrs.I saw that kawa change the reed stuffer for 03 just as I suspected,The 00-02 went to a horizontal divider from the 99 which was just open.This caused too much fuel velocity going to that bottom right reed.The 03 has a vertical and horizontal line.The difference from a 160 to a 158 is very minute,but I did notice the clean up,I do not know the the sizes in mm.