By cliffykFound this floating about the web today--it's a nice manual...
2005-2012 Kawasaki Mule 610/600 Service Manual
By TravisThis file contains all specifications,troubleshooting and repair procedures for the FE290D (9.5H.P,286cc) engine used in the Mule 500,520 and 550 models.
Topics covered include, general information, service data, disassembly, reassembly,inspection of parts and maintenance.
Make sure you're reading the correct information as this manual covers multiple FE series engine, some of which were not used in Mules, the manual does a very good job of clarifying which specifications and procedures are for which Model engine.
By Alex2010-2013 Kawasaki Teryx 750 Service Manual
TERYX 750 FI 4x4
TERYX 750 FI 4x4 LE
TERYX 750 FI 4x4 SPORT