Yeah definitely check the carb - running lean is the number one enemy for 2 strokes. I would still pull the head / exhaust off before you run it again. You mentioned heavy engine braking - that sounds like a partial seize. Often they'll run after that but you're risking dumping bits of piston skirt in the bottom end and trashing the crank / mains and that's full rebuild time.
Yeah definitely check the carb - running lean is the number one enemy for 2 strokes. I would still pull the head / exhaust off before you run it again. You mentioned heavy engine braking - that sounds like a partial seize. Often they'll run after that but you're risking dumping bits of piston skirt in the bottom end and trashing the crank / mains and that's full rebuild time.