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Take them to a good dealer and have them checked out. By the book maintenance and good fuel are ESSENTIAL to reliability from those motors(and any motor for that matter). I don't know that the 2005 motors had updates to be done as 2003's were the most problematic and many of the issues with them were ironed out with updates and then the updates were applied to current motors on the assembly line. I had a set of 2003's and as Archie said, ran them daily for four years and piled up 3000 hours before repowering with four stroke 250's.
Good luck!
Good luck!