Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 99Get this manual
Power Unit 32) Inspection of Valve
1Check valve for dent and wear on the faceReplace if necessary2Measure valve stem outer diameter aReplace if it is less than specified valueValve Stem Outer DiameterStandard value Intake Side (IT)5.47 mm (0.2154 in) Exhaust Side (E)5.46 mm (0.2150 in) Functional LimitIntake Side (IT)5.45 mm (0.2146 in) Exhaust Side (E)5.44 mm (0.2142 in)
Measure valve stem runoutReplace if it is over specified valueValve Stem Runout LimitIntake Side (IT)0.05 mm (0.0020 in) Exhaust Side (E)0.03 mm (0.0012 in)
33) Inspection of Valve Guide