Excuse Me For Butting In...
Hi, I did the trip last year from Veracruz, Mexico, to Ushuaia. Spanish is an enormous help, even a smattering, particularly at frontiers. Guidebooks tend to warn of bad experiences with cops, Customs and Immigration. The one holdup I suffered was at the Honduras frontier close by Copan.The head of Customs insisted I drink
with him in his office and watch the Mexico/France match (World Cup). Courtesy and humour get you further than cash. The most valuable phrase is Esculpame
. Excuse me... When chosing a bike, think SPARE PARTS! Hopefully you won't need them. However, the bigger the bike the more difficult to locate spares. A big bike also creates a wealth barrier between you and the country folk. I ride a 125 Honda but would prefer a 250 - aged 74, I couldn't handle anything heavier.
The Panamericano is a truck fest.
I hate trucks.
I am on my way north now to NY - though have been in Rio Grande (Tierra del Fuego) the past month waiting for a broken ankle to heal. I got run down from the rear by three trucks. OK, so two were on the prime mover's trailer - it counts as three! Message me if I can be of help. Most information is on my BLOG at home
Go for it, good luck and have fun,