2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 219Get this manual

2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 219

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VALVES AND VALVE SPRINGS
When installing new valve, always replace the valve guide If the valve is removed or replaced, always replace the valve stem sealValve stem runout: 0.010 mm (0.0004 in)