Bombardier SeaDoo 2001 factory shop manual, Page 257Get this manual
Subsection 03
Section 06 ENGINE MANAGEMENT (DI) (COMPONENT INSPECTION AND ADJUSTMENT)
CAUTION: If the TDC setting is adjusted too advanced, this will cause serious damage to the engineAdjustment In this operation, the ignition timing light and B.U.D.Sare used to synchronize the MPEM TDC reference with the engine crankshaftThis timing adjustment will affect the timing of ignition as well as direct injector timingsThe aim of the adjustment is to align the mark on the flywheel with the pointer at idle using the timing light and B.U.D.SWhen this is achieved, then the MPEM TDC reference is synchronized with the engine crankshaft1 5