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

2001 Yamaha YFM660 Raptor Factory Service Manual, Page 216

CYLINDER AND PISTON

CHECKING THE PISTON PIN INSPECTION 1.Check: Piston pin Blue discolorationgrooves Replace, then inspect the lubrication system2.Measure: Piston pin-to-piston clearance

Measurement steps: Measure the piston pin outside diameter aIf out of specification, replace the piston pinOutside diameter (piston pin): 21.99122.000 mm (0.86580.8661 in)
Measure

the piston inside diameter b

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