1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 101Get this manual
BODY, STEERING AND SUSPENSION FOXTM Shock Maintenance
20Lubricate a-Ring and piston ring on IFP with clean shock oilCompress the piston ring and install carefully in reservoir 21Push piston into reservoir slowly, allowing air to escape from beneath piston through bleed hole as piston is installedContinue to push piston into reservoir approximately 2"Piston will be submerged in oil22Inspect bleeder screw a-Ring for damage and replace if necessaryInstall bleeder screw and a-Ring lightly in pistonDo not tighten at this point
23Tip shock to 150 angle and fill main shock body to 12" from topAlways add oil slowly to minimize air bubbles in oil24Slide jounce bumper to top of damper rod and position bearing cap in middle of rod25Compress piston ring and insert rod into shock body until half submerged in oilRotate rod and wiggle piston and rod to help disperse air from valve piston