2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 183Get this manual

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VALVE AND VALVE SPRINGS
12 Measure: Compressed spring force Out of specificationReplace the valve springb Installed length Compressed spring force: Intake 82 96 at 34.5 mm (8.2 9.6 kg at 34.5 mm

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