Originally Posted by CordR
I don't want to race through all the countries as some sort of conquest
Then dont do it. Pick one or two countries and have fun instead of watching the world vibrate through your visor for 4 weeks. It would be real easy to spend a month in one country and have a fantastic experience.
In Colombia, Mike from Casa Blanca and Motolombia rents nice bikes, with or without him as a guide. Peru has plenty of moto-tour operators and you can probably just rent a bike there as well. Bolivia I'm not sure about, but Fernando at KTM Santa Cruz might be set up to do that as well.
Heck, you can even go buy a cheap chinese bike, ride it for a month, then sell it before going home. Lots of options for a memorable trip without blasting 10,000 miles and not be able to see or do anything.