Bombardier SeaDoo 2001 factory shop manual, Page 121Get this manual
Section 04 ENGINE Subsection 05 (TOP END)
Cylinder Base Gasket
NOTE: The general procedure is to install new gasket of the same thicknessHowever, if you do not know the gasket thickness that was installed or if crank repair has involved replacement of connecting rods, refer to the COMBUSTION CHAMBER VOLUME MEASUREMENT to properly determine the required gasket thicknessDifferent thicknesses of cylinder base gaskets are used for precise adjustment of the combustion chamber volumeTo identify gasket thickness, refer to the identification holes on the gasketRAVE Valve
787 RFI Engine Make sure to insert O-ring no23 onto rod of sliding valve no22The TOP position of the sliding valve no22 is indicated on one side