2004 Ski-Doo Elite Factory Service Manual, Page 151Get this manual
Section 04 ENGINE Subsection 08 (CYLINDER HEAD AND VALVES)
Installation
For installation, reverse the removal procedurePay attention to the following detailsInstall valve stem seal no28
After spring is installed, ensure it is properly locked by tapping on valve stem end with soft hammer so that valve opens and closes few timesCAUTION: An improperly locked valve spring will cause engine damage