2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 383Get this manual
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MAINTENANCE SPECIFICATIONS Item Piston rings: Top ring
0.75 mm (0.0295 in) 0.13 mm (0.0051 in)
Dimensions (B T) End gap (installed) Crankshaft:
2.8 2.8 mm (0.11 0.11 in