Yamaha F100B F100C Outboards Factory Service Manual, Page 134Get this manual
Quality of the image is intentionally reduced!
Power unit
1 Check the piston ring dimensions of and TReplace if out of specification
S60C5850
Piston ring dimensions: Top ring a: B: 1.171.19 mm (0.04610.0468 in) T: 2.83.0 m