2010-2011 Yamaha RS Vector / RS Venture Service Manual, Page 264Get this manual
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VALVES AND VALVE SPRINGS
Compressed valve spring force (installed): 103.40119.00 at 34.60 mm (10.5412.13 kgf at 34.60 mm, 23.2426.75 lbf at 1.36 in)
13.Measure: Valve spring tilt Ou