I turned back to Lima where I am now. I will try go get a new sprocket and chain tomorrow although its new years day so it may be difficult.
I worry too much. I know. But I am about to go into uncharted terrotery and my life can worst case senario depend on weather my bike will keep running or not. Im not trying to be dramatic. Just realistic. The Bolivian and Chilian antiplato is waiting...
Happy new year to all. And again , thanks a bunch for your input.