giving this some thought, and reading the replies, it's funny what some people consider problems, and what "I" consider problems (and some of you other guys, too.)
for instance, when i cleaned and rebuilt my carb, then broke the banjo bolt on reassembly (there's a picture of a generic one in case you have no idea what i'm talking about) i freaked out for a minute, made a few calls trying to find another one, smoked a few cigarettes until i wasn't so p155ed off at "cheap chinese junk," then went through my box of old hardware, found a bolt that fit, drilled some holes in it and made my own. it's been working fine for 2 months.
a lot of people would be waiting two weeks for a new carb to come from ebay.
that being said, i'm not putting down people that have little to no mechanical (or Macguyver-able) abilities, and i'm always trying to help people out, sometimes to the point of absurdity, (like the one thread where the final solution to the stalled bike problem turned out to be, "i'm supposed to use the clutch when i stop?" or the 4 pages that ended with "oh, i have to pedal away from a light?")
i think that's why these bikes are having a hard time breaking into the mainstream, fad, distinction. people aren't building go-carts out of 2x4's and tricycle wheels anymore, they're buying them, and they expect them to work. and when they stop working, they end up at the thrift store or selling for half of what they were new. with these bikes, there's constant maintenance, even if that means just making sure your exhaust baffle's not falling off...
(here's a tip for that, after you get it tight with a screwdriver, get some vice grips and crank it down another full turn...)
this is a tough hobby if you don't know what an air leak feels like, or which way to turn your left side pedal to get it off.
but at least, according to the hundreds of "my bike died!" threads, you're learning...
oh yeah, here's a banjo bolt...