2005 Ski-Doo Tundra, Skandic, Expedition Shop Manual, Page 438Get this manual
Section 08 ELECTRICAL Subsection 01 (IGNITION TIMING)
593 and 593 HO SDI Engine Types Normally ignition timing adjustment should not be requiredIt has been set at factory and it should remain correctly adjusted since every part is fixed and not adjustableThe only time the ignition timing might have to be changed would be when removing and reinstalling the magneto housing, replacing the crankshaft, the magneto flywheel, the trigger coil or the MPEMIf the ignition timing is found incorrect, first check for proper crankshaft alignmentThis might be the indication of twisted crankshaftRefer to LEAK TEST AND ENGINE DIMENSION MEASUREMENTThe ignition timing can be checked with either the engine hot or coldAlso, the ignition timing is to be checked at 3500 RPM with timing lightNOTE: Between 3000 and 4000 RPM, the spark advance does not changeSo when checking ignition timing at 3500 RPM, change in engine speed within 500 RPM will not affect the timing mark when checked with the timing light
Scribing Timing Mark
Clean the area around the MAG spark plug, and remove it Install the TDC gauge (PN 414 104 700) in the spark plug hole, (magneto side) and adjust as follows: Position the MAG piston at approximately TDCA06E2BA