2007 Arctic Cat Four-Stroke Factory Service Manual, Page 533Get this manual
4With the reservoir pressurized, push down on the shock shaft until it nearly bottoms and release itThe shaft should return to its extended position smoothly ! NOTE: If soft spot or mushy area is felt as the shaft is pushed down, this would indicate air in the shock bodyIf there is air in the shock body, discharge the reservoir gas pressureDisassemble the shock to the point that the "filling with oil" and the "bleeding air" procedures can be redoneAssemble and repeat the pressurizing procedureTo test the shock absorber for nitrogen gas leaks, submerge in water