2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 73Get this manual
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GEAR SELECTION 1 Chain and sprocket part number Parts name Teethlinks 18 teeth 19 teeth 20 teeth Parts no8FA-17682-80 8FA-17682-90 8FA-17682-00
8FA-17682-10 8FA-17682-20 8FA-17682-30 8FA-17682-4