1997 Ski-Doo Factory Shop Manual Volume One, Page 68Get this manual
Sub-Section 03
Section 03 ENGINE (377, 443 AND 503 ENGINE TYPES)
ENGINE REMOVAL AND INSTALLATION
Disconnect or remove the followingWARNINGBefore 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) belt guard drive belt drive pulley using appropriate puller, refer to 04-03 DRIVE PULLEY air silencer and carburetors impulse line from engine crankcase 4-connector housing exhaust pipe and exhaust cooling hose on so equipped models oil pump inlet tube and plug it oil pump cable