2004-2005 Honda TRX450R Factory Sevice Manual, Page 156Get this manual
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CYLINDER HEADIVALVE Install he following:
Tigh ten the fast eners in order as followsTORQUE: Hanger plate bo lt: 26 Nm (2.7 kgfm, 20 Ibf.ft Engine hanger nut: 54 Nrn (5.5 kgf-m, 40 Ibfft)