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fix known problems first, pull all normal maintenance, perform all your tuning, then install a BBK if needed.
BBKs come in 4 sizes:
63cc - many of these are found from factory installations when they are supposed to be 49cc
72cc, termed a BBK 80 -- from my research that is what these scooters were originally designed to be by Honda- I installed only a few of these, the best one was from valley scooters-
82cc, termed a BBK 100 - these require no crankcase boring- they are generally reliable - but there are differences between China and Taiwan made
the last does require crankcase boring, as well as a crank swap. I have not personally done one of these, but my attitude here is IF you need this amount of power, just get a bigger scooter which would prove more reliable.
49cc, 63cc,and 72cc typically do not require carb rejetting- the 82cc does require carb tuning
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