E
2-8
TIGHTENING TORQUE/GENERAL TORQUES
SPEC
TIGHTENING TORQUE
Part to be tightened
Tightening torques
N·m
kgf·m
ft·lb
POWER UNIT
Crankcase
1st
15
1.5
11
2nd
28
2.8
20
Cylinder head
1st
15
1.5
11
2nd
28
2.8
20
Exhaust cover
1st
4
0.4
2.9
2nd
8
0.8
5.8
Spark plug
28
2.8
20
Flywheel nut
100
10
72
Power unit mounting bolt
21
2.1
15
UPPER CASE AND GEAR CASE
Upper mount rubber bolt
17
1.7
12
Bracket mounting bolt
11
1.1
8.0
Bracket bolt
45
4.5
33
Ring nut
90
9.0
65
Pinon nut
36
3.6
25
Lower case mounting bolt
38
3.8
27
Propellor nut
30
3.0
22
GENERAL TORQUES
This chart specifies tightening torques for stan-
dard fasteners with a standard ISO thread
pitch. Tightening torque specifications for spe-
cial components or assemblies are provided in
applicable sections of this manual.
To avoid warpage, tighten multi-fastener
assemblies in a crisscross fashion and pro-
gressive stages until the specified torque is
reached. Unless otherwise specified, torque
specifications require clean, dry threads.
Components should be at room temperature.
General torque
Nut (A)
Bolt (B)
specifications
N·m
kgf·m
ft·lb
8 mm
M5
5
0.5
3.6
10 mm
M6
8
0.8
5.8
12 mm
M8
18
1.8
13
14 mm
M10
36
3.6
26
17 mm
M12
43
4.3
31
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