2001 Yamaha YFM660 Raptor Factory Service Manual, Page 216Get this manual

2001 Yamaha YFM660 Raptor Factory Service Manual, Page 216

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CYLINDER AND PISTON
Piston pin bore inside diameter: 22.00422.015 mm (0.86630.8667 in)
Calculate

the piston pin-to-piston clearance with the following formula
Piston pin