2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 204Get this manual
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CYLINDER HEADIVALVECAMSHAFT
18 Nm (1.8 kqt-m, 13 Ibf.ft)
12 Nm (1.2 kgf.m, 9lbfftj
54 Nm (5.5 kqt-rn, 40 Ibf.ft)