I have 2 KDX's and need to jet them. Mine KDX has a pipe, and aftermarket silencer (that sure added some go) no airbox cover, and seems to perform very well with a 155 main but is fouling plugs right after starting. Today I did my 1st chop throttle reading at full throttle and it looked good. My daughters KDX has stock pipes and has a 158 in it and never fouls anything but throttle roll on is flat for the 1st couple seconds and then it comes on strong. Armed with minimal knowledge I did play with the airscrew on mine with unknown results so far. I am now thinking the main might be fine and that I should look at the needle setting next. Is this correct? Any thoughts appreciated, I haven't pulled carbs apart for a long time but will give it a try tomorrow. I'm at 4000' and 60 degrees.
