You have a fan on your magneto blowing air through the black plastic shroud over the cylinder and head that exits around the exhaust manifold. That's most likely what you're feeling.
Exhaust leaks generally come with performance issues and sometimes with backfiring. How's your engine running?
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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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