2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 42Get this manual
MAINTENANCE SPECIFICATIONS Item Stem runout limit -Standard
Limit 0.01 mm (0.0004 in)
Valve seat width
0.91.1 mm (0.03540.0433 in) 0.91.1 mm (0.03540.0433 in)
Valve spring: Inner spring Free length
32.63 mm (1.28 in) 36.46 mm (1.44 in) 27.5 mm (1.08 in) 31.0 mm (1.22 in)
Set length (valve closed) Compressed pressure (installed)