new 450r troubles!
 

http://www.hondanews.com/categories/171/releases/2871
This page from Honda News has all the changes from 04/05 to 06/07. Changes that could effect reliability include intake valves are now titanium and compression ratio increased from 10.5 to 12.0 to 1. So watching valve adjustments will be more critical and higher octane gasoline will be more critical.