2004 Ski-Doo REV Series Factory Service Manual, Page 308Get this manual
Section 08 REAR SUSPENSION Subsection 01 (SC-10 SUSPENSION)
Renew if any faults are presentAll Models Equipped with Gas Pressurized Shock NOTE: Gas pressurized shocks are light gray or purple painted, or bare aluminumGas shock can be inspected as follows: Because of gas pressure, strong resistance is felt when compressing shockWhen released, the shock will extend unassistedRenew as requiredIf suspecting an internal gas leak between oil chamber and gas chamber, check shock as follows: Install shock in vise clamping on its bottom eyelet with its rod upwardLet it stand for minutesCompletely push down the shock rod then releaseRod must come out at steady speedIf speed suddenly increases particularly at end of extension, replace shockAll Types of Shocks If suspecting frozen shock proceed as follows: Place shock in freezer (temperature below 0C (32F)) for hoursPush down on rod and note its resistance, compare to new shockIf shock is frozen it will be impossible to compress