2004 Skidoo ZX Series Service Manual, Page 231Get this manual
Section 05 ENGINES (4-TEC) Subsection 03 (REMOVAL AND INSTALLATION)
Drain the engine oilPut back vehicle on the groundRemove muffler and pipesRemove coolant reservoir capSiphon as much coolant as possibleDisconnect bottom hose from thermostat housingDisconnect side hose from thermostat housingDisconnect air bleed hose from T-fitting no2Disconnect alternator, then ground cable from engine support