80 days is not very long, i would fly down to chile buy a bike tour around then sell it off before leaving. there are also quite a few threads about the best country to buy a bike so do some research into that. ( i believe if you buy a bike in argentina you cannot leave the country with it)
if you have a look in the ride tales section there are a lot of stories on peoples trip across south america. just see what you like and start making marks on a map, the then join the marks via the squiggliest roads possible
and enjoy yourself
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