Bombardier SeaDoo 1999 factory shop manual, Page 152Get this manual
Section 04 ENGINE Subsection 07 (ROTARY VALVE)
Remove degree wheel Position rotary valve on shaft splines to have edges as close as possible to these marks with the MAG piston at TDCNOTE: Rotary valve is asymmetricalTherefore, try flipping it over then reinstall on splines to obtain best installation positionApply BOMBARDIER-ROTAX injection oil on rotary valve before reassembling rotary valve cover Remove TDC gauge