2001 Ski-Doo Factory Shop Manual Volume One, Page 103Get this manual
Subsection 02
Section 04 ENGINE (377, 443 AND 503 ENGINE TYPES)
ENGINE REMOVAL AND INSTALLATION
Disconnect or remove the following:
WARNING
Before disconnecting any electrical wire in starter system always first disconnect the BLACK negative battery cable (on electric starting models) negative cable from battery (on electric starting models) guard drive belt drive pulley using appropriate puller, refer to DRIVE PULLEY air silencer and carburetors impulse line from engine crankcase electrical connector housings exhaust pipe oil pump inlet line and plug it oil pump cable rewind cable: tie knot near rewind housing and remove starting grip