2000-2005 Yamaha F40B Outboard Service Manual, Page 256Get this manual

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CRANKSHAFT AND PISTON
2Measure: Side clearance Out of specification Replace the piston and piston rings as set
Side clearance Top ring 0.040.08 mm (0.0020.003 in) 2nd ring 0.030.07 mm (0.0010.003 in) Oil ring 0.040.18 mm (0.0020.007 in)

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