my thoughts:
the 50mm without the stroker crank is worthwhile and safe. have ridden all versions but stroker and the 82cc, is really worth the time vs the 73cc, 62cc and 49cc.
Some performance exhaust sound good, but attract police
19mm carb, just make sure that you get what you pay for.IOW... measure it. some smaller bores perform better
A9 cam, definitely yes, but get one from a reliable source
k&n, not sure
digital, go for full digital instrumentation and ditch the mechanical / analog
tygon fuel line, just make sure it is USA made, as chinese seems to get hard and brittle too easy
sound system, lights-- make sure you upgrade the charging system to provide the power otherwise dead battery-- contact user John (tvnacman) for the parts and instructions
other stuff, not sure
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