1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 189Get this manual
ASSV AND
SERVICE POINTS
Cylinder inspection 1Measure: Cylinder bore Out of specification replace the cylinder
Rebore or
NOTE: _ Measure the cylinder bore in parallel and at right angle to the crankshaftThen, average the measurements
Standard
Wear limit
D1 and D2
D3 and D[c:::=:::
D5 and De
65.00065.015 mm Cylinder (2.55902.5596 in) bore "0" 0.08mm Taper (0.003 in) limit "T" 0.08mm Out of (0.003 in) round limit