2001 Yamaha YFM660 Raptor Factory Service Manual, Page 210Get this manual

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VALVES AND VALVE SPRINGS
Compressed spring force: Inner: 149173 at 27.2 mm (15.1917.64 kg, 33.5038.89 lb at 1.07 in) Outer: 165191 at 30.7 mm (16.8319.49 kg, 37.0942.94 lb at 1.21 in)

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