I didn't see devrou on the list. He sells a fair # of engine kits on ebay.
Here's where I got mine:
80cc Motorized Bicycle Bike Motor Moped Kit Engine NR - eBay (item 150255746834 end time Jun-12-08 10:02:09 PDT)
Yeah he says 80cc, his schnizzits are about the same as others - some stuff is the better stuff....but my carb needle had no taper, the clutch cable housing is too long for the cable, the upgraded fuel valve broke in two....etc all after warranty. Shows a chrome tank...it's black......better clutch handle and throttle. Does come with the tools (unlike I've heard from others).