Service/Owners Manuals

Howdy! I just purchased my first quad - 2000 300 EX. I'm curious as to the year/model differences of the EX's. I notice that some newer ones are called Sportrax, but mine is a Fourtrax. Does anyone have model year data on what years offered changes/upgrades etc? I'm looking for manuals, service and owners online, and have found a set for an 01, but don't know if those will be ok for my 00...Any help???
Thanks!
Also, any recommendations for chain/sprockets? This one appears to need the chain badly and I've been told to replace chain/sprockets as a set.