Yamaha F100B F100C Outboards Factory Service Manual, Page 134Get this manual

Yamaha F100B F100C Outboards Factory Service Manual, Page 134

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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