2000-2005 Yamaha F40B Outboard Service Manual, Page 252Get this manual
!POWR! 'J !CRANKSHAFT AND PISTON CHECKING THE PISTON-TOCYLINDER CLEARANCE
1Measure: Cylinder bore Out of specification cylinder or replace blockStandard Rebore the the cylinder Wear limit-
01 and 02
03 and 04 05 and 06
Cylinder bore "0" Taper limit "T" Out of round limit T
65.00065.015 mm (2.55902.5596 in)