Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 90Get this manual
16) Inspection of Cam Shaft 1Check cam shaft gear and decompressor for damage and wearReplace if necessaryMeasure cam heightReplace if the diameter is less than specified valueCam Height a, both intake and exhaustStandard value 24.04 mm (0.9464 in) Functional Limit23.78 mm (0.9362 in)
Measure cam shaft run outReplace if it is over specified valueCam Shaft Runout Limit0.03 mm (0.0012 in)