2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 28Get this manual
ENGINE SPECIFICATIONS Item Valve spring Inner spring Free length Standard
36.17 mm (1.42 in) 36.17 mm (1.42 in)
34.36 mm (1.35 in) 34.36 mm (1.35 in) 2.51.60 mm (2.50.063 in) 2.51.60 mm (2.50.063 in)
Installed length (valve closed) Spring rate K1 K2 K1 K2 Compressed spring force (installed)
IN EX IN IN EX EX IN EX
30.50 mm (1.20 in) 30.50 mm (1.20 in) 14.70 Nmm (1.50 kgmm, 83.94 lbin) 19.00 Nmm (1.94 kgmm, 108.49 lbin) 14.70 Nmm (1.50 kgmm, 83.94 lbin) 19.00 Nmm (1.94 kgmm, 108.49 lbin) 75.0091.70 (7.659.35 kg, 16.8620.62 lb) 75.0091.70 (7.659.35 kg, 16.8620.62 lb)
Tilt limit