2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 376Get this manual
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MAINTENANCE SPECIFICATIONS Model Shock absorber: Damping force Extension
FX10FX10RTFX10RTRFX10RTRAFX10MTFX10MTR FX10MTRA 1,371 N0.3 ms (139.8 kg0.3 ms, 308.2 lb0.3 ms) (FX10 "USACanada") 1,334 N