1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 193Get this manual
IPOWRI &1
CRANKSHAFT ASSY", AND CYLINDER CD
2Measure: Side clearance Out of specification -7 Replace the piston and piston rings as set) Side clearance: Top piston ring: 0.04 0.08 mm (0.002 0.003 in) 2nd piston ring: 0.03 0.07 mm (0.001 0.003 in) Crankshaft inspection 1Measure: Crankshaft runout Out of specification crankshaft
Replace the
Crankshaft runout limit: 0.03 mm (0.0012 in)
Main-bearing oil clearance 1MeasureMain-bearing oil clearance Out of specification -7 Replace the bearings as setMain-bearing oil clearance: 0.012 0.044 (0.0005 0.0017 in)