Since nobody else has chimed in yet, will give the default suggestion: you need to find widebody flights with no stopovers, and contact that airline's cargo department. They will either handle it themselves or point you towards a freight forwarder they deal with.
Aeromexico flies 787s directly from Mexico City to Buenos Aires, so start at https://amcargo.aeromexico.com/. There is also a BA-based company called Dakar Motos that should at least give you good advice on paperwork etc.
Both Aeromexico and LATAM fly directly MEX to SCL.
There are also direct flights to Lima in Peru.
EDIT: Aeromexico Cargo has a specialist Motorcycles section! https://amcargo.aeromexico.com/servi...al/specialized
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