Yamaha YZ250(W)/W1 Owner's Service Manual page 282

CYLINDER HEAD, CYLINDER AND PISTON
8. Install:
9 Engine bracket 1
9 Bolt (engine bracket) 2
9 Engine mounting bolt (upper) 3
9. Install:
9 Spark plug 1
9 Spark plug cap 2
4-32
ENG
34 Nm (3.4 m•kg, 24 ft•lb)
64 Nm (6.4 m•kg, 46 ft•lb)
20 Nm (2.0 m•kg, 14 ft•lb)