2004 Skidoo ZX Series Service Manual, Page 417Get this manual
Section 08 TRANSMISSION Subsection 05 (BRAKE)
Ensure that countershaft is properly aligned, then tighten retaining screwsNOTE: misaligned countershaft will result in difficulty to center the bearing in its supportTorque castellated nut of upper sprocket to 45 to 75 Nm (33 to 55 lbfft)Close chaincase referring to CHAINCASE
COUNTERSHAFT
Removal
Proceed the same as for countershaft bearing removal and then remove the countershaft no16
Inspection
Check countershaft for bending, rust or other damagesReplace if necessary
Installation
The installation is the reverse of removal procedure