Solid advice right there ^^^^
Could be running out of fuel.
Could be poorly jetted and the temperature change can be affecting it too
Could be valve adjustment
Could be very low compression.
I suggested checking the valve clearance first, because a valve "hanging up" can cause low compression. Doesn't necessarily mean the cylinder, piston, and/or rings are bad
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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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