2011 Yamaha Raptor 125 Factory Service Manual, Page 186Get this manual

2011 Yamaha Raptor 125 Factory Service Manual, Page 186

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CYLINDER AND PISTON TIP
a40 mm (1.57 in)

CHECKING THE PISTON PIN 1 Check: Piston pin Blue discolorationgrooves Replace the piston pin and then check the lubrication system2 Measure: