Bombardier SeaDoo 1998 factory shop manual, Page 104Get this manual
Section 04 ENGINE Subsection 05 (TOP END)
NOTE: When checking the combustion chamber volume, engine must be cold, piston must be free of carbon deposit and cylinder head must be leveled1Remove both spark plugs and bring one piston to Top Dead Center using TDC gaugeF00D0HA
1Top of spark plug hole
F01D2IA
1Bring piston to TDC