i have a little problem with jetting in my 400ex. i have a curtis sparks x6 pipe, uni filter, air box screen, curtis sparks cdi, sparks timing key, and an air box support ring. i am currently running a 158 main, 42 pilot, needle on the 4th notch, and the air screw out 2 1/2 turns. it runs rich from like 1/2 to 3/4 and thats where i do most of my riding at. i live in ohio. any help is greatly appreciated. thanx

 

1/2 to 3/4 is the needle clip.. Lower it a notch