2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 173Get this manual

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VALVES AND VALVE SPRINGS
Compressed spring force: Intake: 100.0115.7 at 27.5 mm (10.2011.80 kg, 22.4826.01 lb at 1.08 in) Exhaust: 120.6138.3 at 31.0 mm (12.3014.10 kg, 27.1131.09 lb at 1.22 in)

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