See this is the problem with posts all over the place. someone was looking for a cheap kit in california and now I can't find him. there is a ebay kit posted in the wrong place so it has no bid and is bidding in 12 hours.
So if you can find him or you are him take a look here
48CC MOTOR BICYCLE ENGINE KIT MOTORIZED BIKE GAS MOPED - eBay (item 230281211107 end time Aug-14-08 17:01:31 PDT)
NOTE HIS NEGATIVE FEEDBACK but the guy wanted to pick it up so maybe it would be okay.