Hello. New to the site but I have read many discussions and just cannot figure this one out. My atv runs great through all gears but when in 4th/5th at about 3/4 throttle it what's to spit or hesitate some. I never noticed it before bc I usually do not run that FAST...I'm usually in trials. It is a fresh rebuild with about 20 hours on it. I have tried diff jets, different clip positions. It was strange but running with lights on. I did the spring mod. Any help will be appreciated. Thanks 2005 with 468 vertex, full yushumur, cam mod, no lid, gytr filter. 500' above It runs best now with lights on(dont know if it matters), 165, 45, 3rd clip on needle about 2 1/4 turns. Thanks again!