2004-2007 Honda Aquatrax ARX1200N3/T3/T3D Factory Service Manual, Page 312Get this manual
CYLINDER HEADVALVE Check the cylinder head for warpage with straight edge and feeler gaugeSERVICE LIMIT: 0.10 mm (0.004 in)
Check the valve lifter bore for scoring, scratches or abnormal wearMeasure each valve lifter bore I.DSERVICE LIMIT: 26.04 mm (1.025 in)