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what torqe shall i apply when fastening a powerdynamo flywheel?
 

Basic rule:  use the torque indicated in the manual for your motorcycle 

if you have no indication whatsoever, here are the standard torques as per screw/nut size (steel to steel)
screw/nut M5 (spanner* 7 or 8) 5 to 6 Nm
screw/nut M6 (spanner 8 or 10) 9 to 11 Nm
screw/nut M8 (spanner 12 or 13) 22 to 25 Nm
screw/nut M10 (spanner 14 or 17) 44 to 50 Nm
screw/nut M12 (spanner 17 or 19) 77 to 85 Nm
screw/nut M14 (spanner 19 or 21) 95 to 110 Nm
screw/nut M16 (spanner 22 or 24) 125 to 155 Nm

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