1997 Yamaha YFM600FWAK ATV Service Manual, Page 133Get this manual
VALVES AND VALVE SPRINGS
10.Measure: Valve spring free length Out of specification -7 ReplaceFree length (valve spring): Inner: 40.1 mm (1.58 in) Limit: 38.1 mm (1.50 in) Outer: 43.8 mm (1.72 in) Limit: 41.6 mm (1.64 in) 11.Measure: Compressed spring force Out of specification -7 ReplaceE Installed length Compressed spring force: Inner: 7.3", 8.9 kg at 31.2 mm (16.1 '" 19.2 Ib at 1.23 in) Outer: 15.2", 18.6 kg at 34.2 mm (33.5 '" 41.0 Ib at 1.35 in)