Bombardier SeaDoo 2001 factory shop manual, Page 256Get this manual
Section 06 ENGINE MANAGEMENT (DI) Subsection 03 (COMPONENT INSPECTION AND ADJUSTMENT)
NOTE: This specification is of the type "indirect measurement" relative to the piston movement since we are measuring at 45 angle through the spark plug hole7Scribe thin mark on PTO flywheel aligned with timing mark pointer toolNOTE: This mark becomes the reference when using the stroboscopic timing lightCAUTION: The static test cannot be used as TDC setting procedure, therefore, always check the TDC setting with stroboscopic timing light8Remove TDC gauge9Reinstall spark plug and connect wire
Dynamic Test
To check TDC setting, use Bombardier timing light (PN 529 031 900)
IMPORTANT: To check the TDC setting, the spark advance curve must be locked firstThis allows to perform TDC setting at any RPM by keeping the ignition timing "frozen" so that it does not vary with engine RPMSee TDC Setting below for more informationCAUTION: If the spark advance curve is not locked using B.U.D.Sthen wrong ignition timing will be seen as the ignition curve does not match the locked ignition timing11Start engine and check marks at idle speedPoint beam of timing light straight in line with timing mark pointerNOTE: Look at the mark at the same angle as it was scribed so that parallax error is minimizedA00B4FA