Yamaha YZ450F Manuel D'atelier Du Proprietaire page 538

STEERING
10. Tighten:
Pinch bolt (handle crown) 1
G
Pinch bolt (under bracket) 2
G
CAUTION:
ACHTUNG:
Tighten the under bracket to specified
torque. If torqued too much, it may cause
the front fork to malfunction.
5 - 49
CHAS
23 Nm (2.3 m · kg, 17 ft · lb)
20 Nm (2.0 m · kg, 14 ft · lb)