2007 Yamaha Apex Factory Service Manual, Page 185Get this manual

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VALVE AND VALVE SPRINGS

13 Measure: Valve spring tilt Out of specificationReplace the valve springSpring tilt: Intake 2.5_1.7 mm (0.067 in) Exhaust 2.5_1.8 mm (0.071 in) 14 Inspect: Valve

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