please see now:

Overland to, in and around North -and South America by Motorcycle
Both Americas Motorcycle - Travels / Reisen / Adventures
Süd- + Nord-Amerika Motorrad-Reisen
On this site you find summaries of travellers who have travelled already in South-America, just travelling ther or have the plan to travel S- and NA.

Alaska > Tierra Del Fuego (Southern tip of South America) + Tierra Del Fuego > Alaska
= Alaska-Feuerland  Motorrad-Reisen

See South-America
See North-America

North- and South-America including other continents
See Around-The-World

Panamericana = "Carretera Panamericana" = "Pan-American Highways" verbindet Alaska mit Feuerland.