2004 Skidoo ZX Series Service Manual, Page 233Get this manual
Section 05 ENGINES (4-TEC) Subsection 03 (REMOVAL AND INSTALLATION)
Check pulley alignment and drive belt heightInstall doughnut shaped exhaust gasket with both notches aligned with Y-manifold protrusionsNOTE: No sealant required on doughnut shaped exhaust gasketTorque screws no6 of engine supports to 37 Nm (27 lbfft)NOTE: Install washers no5 with the teeth toward the support