2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 152Get this manual

2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 152

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CYLINDER AND PISTON
2nd step: Measure piston skirt diameter "P" with micrometera 5.0 mm (0.20 in) from the piston bottom edge

Piston skirt diameter "P" Standard

84.4458