I looked into this with a KTM SXC I had and liked a lot. However once you take into account shipping, paperwork, customs, GST, inspection, attachment of an approval plate, etc... it became far too expensive.
For a rare sportscar worth $100,000 it would be well worth it. For a motorbike worth $5000 it is not.
I got all my info through Googling and finding various people's reports (there was a particularly good one about a guy importing a Lotus from the UK). Spend an hour or two doing that and you'll have a reasonable idea of the cost and work involved.
Vladivostok - Denmark 2008... Finished.
Denmark - South Africa 2010-2011... Finished.