2001 Ski-Doo Factory Shop Manual Volume One, Page 256Get this manual
Section 06 ELECTRICAL Subsection 06 (TESTING PROCEDURE)
TESTING PROCEDURE
GENERAL
The following chart gives the engine types with their implemented systemENGINE TYPE 503 on Skandic WTSWT IGNITION SYSTEM Ducati trigger coil CDI CHARGING SYSTEM OUTPUT 240
377, 443 and 503 RER dual trigger coil CDI on Skandic LT (twin cylinder) and S-Series with RER 593 on Skandic WT LC Nippondenso trigger coil CDI