Yamaha YZ250N Owner's Service Manual page 72

Part to be tightened
Spark plug
Cylinder head (nut)
(stud)
Cylinder (nut)
(stud)
Power valve :
Holder
Link rod
Push rod
Thrust plate
Side holder
Link lever
Pulley
Cover
Governor fork
Housing
Impeller
Water pump housing cover
Coolant drain bolt
Radiator
Radiator hose clamp
Air filter element
Carburetor joint
Air filter case
Air filter joint
Reed valve
Exhaust pipe
Exhaust pipe stay (front)
Exhaust pipe stay (rear)
Silencer (front)
Silencer (rear)
Fiber (silencer)
Crankcase
Crankcase cover (left)
Chain cover
Crankcase cover (right)
Bearing plate cover (drive axle left)
Bearing plate cover (main axle right)
Holder
Oil drain bolt
Oil check bolt
Kick starter
Ratchet wheel stopper
Clutch cover
Primary drive gear
Clutch boss
MAINTENANCE SPECIFICATIONS
Thread size
M14 × 1.25
M 8 × 1.25
M 8 × 1.25
M10 × 1.25
M10 × 1.25
M 5 × 0.8
M 5 × 0.8
M 5 × 0.8
M 5 × 0.8
M 5 × 0.8
M 4 × 0.7
M 4 × 0.7
M 5 × 0.8
M 4 × 0.7
M 5 × 0.8
M 8 × 1.25
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 5 × 0.8
M 3 × 0.5
M 6 × 1.0
M 8 × 1.25
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M 6 × 1.0
M12 × 1.5
M 6 × 1.0
M 8 × 1.25
M 6 × 1.0
M 6 × 1.0
M10 × 1.25
M20 × 1.0
2-5
SPEC
Tightening torque
Q'ty
Nm m•kg
1 20 2.0
6 25 2.5
6 13 1.3
4 35 3.5
4 13 1.3
2 6 0.6
2 6 0.6
1 5 0.5
1 6 0.6
4 4 0.4
1 4 0.4
2 4 0.4
4 4 0.4
2 5 0.5
4 5 0.5
1 14 1.4
4 10 1.0
1 10 1.0
6 10 1.0
8 1 0.1
1 2 0.2
5 10 1.0
2 4 0.4
5 1 0.1
4 1 0.1
2 12 1.2
1 25 2.5
1 12 1.2
1 12 1.2
1 7 0.7
2 10 1.0
11 14 1.4
5 8 0.8
2 8 0.8
9 10 1.0
2 10 1.0
2 10 1.0
2 10 1.0
1 20 2.0
1 10 1.0
1 30 3.0
2 10 1.0
6 10 1.0
1 55 5.5
1 75 7.5
ft•lb
14
18
9.4
25
9.4
4.3
4.3
3.6
4.3
2.9
2.9
2.9
2.9
3.6
3.6
10
7.2
7.2
7.2
0.7
1.4
7.2
2.9
0.7
0.7
8.7
18
8.7
8.7
5.1
7.2
10
5.8
5.8
7.2
7.2
7.2
7.2
14
7.2
22
7.2
7.2
40
54