Kind of sounds like a rod knock, or piston slap to me.
1. Are you sure your oil gallery is clear on the cylinder leading up to the head? Did you use any gasket sealer on the cyl base?
2. Do you have oil present in the valve cover?
3. Did you check piston to cyl and piston ring gap when you installed the BBK?
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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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