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Parts to be tightened
Crankcase bolt (M9 × 1.25)
Crankcase bolt (M8 × 1.25)
Crankcase bolt (M6 × 1.0)
Crankcase bolt (M6 × 1.0)
Primary sheave drive shaft assembly bolt
Connecting rod nut
Balancer weight (left and right) bolt
Balancer shaft bearing retainer bolt
AC magneto rotor bolt
AC magneto rotor cover bolt (M6 × 1.0) × 11
AC magneto rotor cover bolt (M6 × 1.0) × 1
Starter clutch bolt
Stator coil bolt
Crankshaft position sensor bolt
Stator coil lead holder bolt
Air filter case bolt
Air filter case joint clamp screw
Throttle body joint clamp screw
Starter motor bolt
Starter motor lead nut
Brush terminal nut
Fuel pump nut
Fuel sender bolt
Fuel tank bolt
Throttle cable locknut (throttle body side)
Rectifier/regulator nut
Rectifier/regulator bracket bolt
Ground earth lead bolt (engine mounting bracket)
Ground earth lead bolt (Rectifier/regulator bracket)
Battery bracket bolt
NOTE:
*1: Tighten the cylinder head bolts to 25 Nm (2.5 m · kg, 18 ft · lb) in the proper tightening sequence, loosen
and retighten the cylinder head bolts to 25 Nm (2.5 m · kg, 18 ft · lb) in the proper tightening sequence,
and then tighten the cylinder head bolts further to reach the specified angle 175 ~ 185° in the proper tight-
ening sequence.
*2: Tighten the crankcase bolts to 15 Nm (1.5 m · kg, 11 ft · lb) in the proper tightening sequence, loosen and
retighten the crankcase bolts to 15 Nm (1.5 m · kg, 11 ft · lb) in the proper tightening sequence, and then
tighten the crankcase bolts further to reach the specified angle 65 ~ 70° in the proper tightening
sequence.
*3: Tighten the connecting rod nuts to 20 Nm (2.0 m · kg, 14 ft · lb), and then tighten the connecting rod nuts
further to reach the specified angle 115 ~ 125°.
TIGHTENING TORQUE
Tightening torque
Nm
m · kg ft · lb
*2
Apply the engine oil.
See NOTE.
24
2.4
17
Apply the engine oil.
12
1.2
8.7
Apply the engine oil.
12
1.2
8.7
Black bolt
Apply Yamaha bond No. 1215
(Three Bond No.1215
12
1.2
8.7
*3
See NOTE.
Apply the molybdenum disulfide
oil.
35
3.5
25
10
1.0
7.2
Apply LOCTITE
130
13.0
94
Apply the engine oil.
12
1.2
8.7
12
1.2
8.7
Apply LOCTITE
12
1.2
8.7
Apply LOCTITE
10
1.0
7.2
Apply LOCTITE
10
1.0
7.2
Apply LOCTITE
10
1.0
7.2
Apply LOCTITE
7
0.7
5.1
3
0.3
2.2
3
0.3
2.2
27
2.7
19
7
0.7
5.1
7
0.7
5.1
7
0.7
5.1
4
0.4
2.9
10
1.0
7.2
6
0.6
4.3
7
0.7
5.1
7
0.7
5.1
25
2.5
18
7
0.7
5.1
23
2.3
17
9-21
SPEC
Remarks
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Table of Contents
Troubleshooting
