2001 Yamaha YFM660 Raptor Factory Service Manual, Page 214Get this manual

2001 Yamaha YFM660 Raptor Factory Service Manual, Page 214

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CYLINDER AND PISTON

Piston skirt diameter "P": Standard

99.94599.995 mm (3.93483.9368 in)

out of specification, replace the piston and piston rings as set3rd ste