Bolivia
Entering Bolivia you should get 180 days for your bike from customs, but many travelers only get 30 or 60 days, this depends on entry point and offical in charge at that moment.
Cant help you with secure parking in La Paz. I live in Samaipata (near Santa Cruz de la Sierra) and organise the HU meeting here 21.04. to 23.04., you are  and I know we will find a secure parking for your bike here.
Enjoy your ride.
mika
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