2002-2009 Suzuki LT-F250 Ozark Service Manual, Page 69Get this manual
Valve spring free length (INEX) Service Limit41.0 mm (1.63 in) Valve spring tension (INEX) Standard: 236 287 N36.8 mm (24.1 29.3 kgf36.8 mm, 53.1 64.6 kgf1.45 in) 09900-20101: Vernier calipers
236 287 N