Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 188Get this manual
CRANKCASE, CRANKSHAFT AND CAMSHAFT
2Measure: 9Side clearance Out of specification Replace the piston and piston rings as setSide clearance: Top ring0.040.08 mm (0.0020.003 in) 2nd ring0.020.06 mm (0.0010.002 in)
Crankshaft inspection 1Measure: 9Crankshaft runout Out of specification Replace the crankshaftCrankshaft runout limit: 0.03 mm (0.0012 in)