Get a clear fuel filter and see if it is running out of gas by looking at it when it acts up.
I had a similar problem that I never figured out. Eventually went with a Mikuni flat slide carb and it disappeared after doing the things listed below.
Get the clear fuel filter.
Try installing some larger diameter fuel hose
Make sure the float height is correct
Make sure the carb vent and hose is clear
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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