O.K. I'am about ready to break down and spend the $70.00 bucks for a JD jetting Kit. I'am determined to get rid of that stutter hesitation at about 1/4 throttle. I'am at 4500 ft. got a 160 main 48 pilot I've tried the stock needle on different clips,my daeler recommended a YZ needle, which I juat installed its a NCVQ, Tried it on 4th, 6th and 3rd clip, it runs the best on 3rd clip down, but the stutter is still there. You guys that have done the JD jets, does it eliminate the problem, or just help?