Yamaha BR250F Service Manual page 180

MAINTENANCE SPECIFICATIONS
I
SPEC
I0--1
Tightening torque:
Part to be tightened
Tightening torque
Remarks
Nm rn-kq ft-lb
Spark plug
28
2.8
20
Cylinder head (bolt) 20 2.0
14
Cylinder head (nut)
25
2.5
18
Flywheel magneto
85 8.5
61
Crankcase upper and lower
First:
20
2.0
14
Tighten the bolts in
Final:
25
2.5 18 two stages.
Tightening sequence
1
710
3
5
0
0 0
- -
0 0
8
~
2 0 4
Crankcase and gear unit 25 2.5 18
Oil pump and gear unit 8 0.8 5.8 With screw lock
Starter pulley
15 1.5
11
Crankcase and engine bracket
25 2.5 18
-21-