2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 221Get this manual
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VALVES AND VALVE SPRINGS
Compressed valve spring force (installed): 112.30129.30 at 34.60 mm (11.4513.18 kg at 34.60 mm, 25.2429.07 lb at 1.36 in) 13 Measure: Valve spring tilt Out of spe