It's essentially the same bike that came out in 1986. Suzuki dropped it for a few years & brought it back with a 5 speed gearbox. A few years ago the oil plug/seal was upgraded & the 2005 has a wider seat & handlebar risers.  The old ones were jetted better but that's an easy fix. There's stuff I've probably left off but that's what I can remember off the top of my head. 8)