Thunder in the Alps
 
It's not worth to bring your own bike over to europe for a short time.
The cheapest way is by sea freight but it would take about 4 weeks (one way).
By air freight the cheapest I found was about $ 1400, and you have to remove the bars to make the box smaller.
I found rental companies where you can rent different bikes. If I find cheaper ones I'll post them here.

I used Google with "motorcycle rental munich" also and I found some sites where you can rent a bike in Munich from a company located in USA. It seems they have agreements with german rental companies.
http://www.allroundrent.de/Motorbikes.aspx
http://www.motocyclerent.de/indexe.html
http://www.gs-sportreisen.de/index.htm
http://www.bmca.com/rental/gerpric.htm
http://www.rental-motorcycle.com/europe/germany/munich_rental.html
http://www.qrental.com/search/g/Motorcycle/loc/Munich