2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 86Get this manual
ENGINE Cylinder Head Assembly CAUTION
Wear eye protection during assemblyNOTE: Assemble the valves one at time to maintain proper order
Valve Sealing Test
12Clean and dry the combustion chamber areaPour small amount of clean, high flash point solvent into the intake port and check for leakage around each intake valveThe valve seats should hold fluid with no seepageRepeat for exhaust valves by pouring fluid into exhaust portValve Clearance Adjustment