2010-2011 Yamaha RS Vector / RS Venture Service Manual, Page 293Get this manual

2010-2011 Yamaha RS Vector / RS Venture Service Manual, Page 293

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CONNECTING RODS AND PISTONS
2nd step: Measure piston skirt diameter "P" with the micrometer11.0 mm (0.43 in) from the bottom edge of the piston
Piston size (standard) (P): 81.95081.965 mm