2009 Yamaha F40 Outboard Service Manual, Page 235Get this manual
POWR Power unit
Piston pin outside diameter a: 15.96515.970 mm (0.62850.6287 in)
Connecting rod big end side clearance a: 0.050.22 mm (0.00200.0087 in)
Checking the connecting rod small end and big end inside diameter
1Measure the connecting rod small end inside diameter and big end inside diameter bReplace the connecting rod assembly if out of specification
Checking the crankshaft