Wilsons Sandbox

Ok bought a Go Kart 150cc CVT forward/reverse .. blah blah http://www.amsportworks.com Model 7150 Has a CVK carb, Kart had known issues when I bought it... Forward: Replaced few parts, airbox, wiring harness ect ect.. Drained tank and filter SEAFOAMED it let it sit waiting for parts, sat about a week started it a few times just to make fuel move. Starts and idles fine, revs fine under no load. ISSUE: in gear, about 1/4 ~ 1/3 throttle engine just cuts right out without pulling other than a second or two. Can see fuel in filter, have drained carb a couple times did get some smaller particles in drain bucket. Have good fuel flow when draining carb sucking on the vacuum petcock. Thought I would toss the question out here and see if any replies are what I am thinking.. Dooden A15 Green Ape