Bombardier SeaDoo 2001 factory shop manual, Page 122Get this manual
Section 04 ENGINE Subsection 05 (TOP END)
When the valve is mounted onto the cylinder, move the valve piston no20 to ensure the sliding valve no22 moves easily and doesn't stick
F12D0ZA
1Piston valve O-ring
Check the sliding valve O-ringReplace if necessary
F01D8LA
947 Carburetor-Equipped Engines Install the supporting ring no28 with the bevel side facing the O-ring no271