2003+ Suzuki DF9.9/DF15 four stroke outboard motors service manual, Page 164Get this manual
MID UNIT
4Install the bush 8, the port clamp bracket and the clamp bracket shaft nut 0, then the nut to the specified torque" Clamp bracket shaft nut: 43 Nm (4.3 kgf-m, 31.0 lb-ft)