2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 383Get this manual
MAINTENANCE SPECIFICATIONS Item Piston rings: Top ring
Standard
Type Dimensions (B T) End gap (installed) Side clearance (installed) 2nd ring
Barrel 1.2 3.3 mm (0.05 0.13 in) 0.200.40 mm (0.0080.016 in) 0.030.08 mm (0.00120.0032 in)
0.65 mm (0.0256 in) 0.13 mm (0.0051 in)
Type Dimensions (B T) End gap (installed) Side clearance Oil ring
Taper 1.5 3.4 mm (0.06 0.13 in) 0.200.40 mm (0.0080.016 in) 0.030.07 mm (0.00120.0028 in)