We met in ViaVia Copan - this is Chris from CATours. how's the ride going, where are you headed now? Like Cruiser guy said, you'll have to import the bikes into Guatemala if you're going to have a chance at getting decent money for them. Otherwise you'll have to sell really cheap b/c the buyers will have to go through all of that, about 25-30% taxes to get Guatemalan plates/titles.
Hope you're still enjoying it!