1997 Yamaha YFM600FWAK ATV Service Manual, Page 137Get this manual

1997 Yamaha YFM600FWAK ATV Service Manual, Page 137

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CYLINDER AND PISTON
Wear limit 95.1 mm (3.744 in)

Piston skirt diameter "P" Standard 94.915 94.965 mm (3.737 3.739 in)

elf out of specification, replace the piston and