2004 Skidoo ZX Series Service Manual, Page 108Get this manual
Section 04 ENGINES (2-STROKE) Subsection 01 (377 AND 552 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 gripTighten fasteners to recommended torque in appropriate exploded viewApply high temperature RTV sealant (PN 293 800 090) on metal-to-metal exhaust joints552 Engine Only Install doughnut shaped exhaust gasket no1 with its both notches aligned with Y-manifold protrusions