2003 Polaris 3 PRO X Factory Service Manual, Page 66Get this manual
ENGINE Disassembly, Cont13Remove reed cover, reed stuffers, and reeds
Reed Valve Inspection
14Measure air gap between fiber reed and reed block as shownThe air gap should not exceed .015 (.4 mm)If clearance is excessive DO NOT attempt to reverse the reeds to reduce the air gapAlways replace them if damagedCheck each fiber reed for white stress marks or missing materialReplace if necessary