2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 216Get this manual

2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 216

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VALVES AND VALVE SPRINGS REMOVAL
Make note of the position of each valve lifter and valve pad so that they can be reinstalled in their original place
2 Inspect: Valve (for leakage) Leakage