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SPEC
TIGHTENING TORQUES
SPECIFIED TORQUES
Part to tightened
ENGINE UNIT
Engine unit – engine mount
Exhaust chamber
assembly – muffler stay 1
– muffler stay 3
Exhaust chamber –
muffler
Exhaust chamber joint –
exhaust manifold
Exhaust chamber joint –
muffler stay
Exhaust manifold –
cylinder
Reed valve – reed valve seat
YPVS cable bracket – YPVS cover
– cylinder
YPVS cover – cylinder
YPVS valve assembly – cylinder
YPVS valve lever – shaft
Spark plug – cylinder head
Cylinder head – cylinder
Cylinder – crankcase
Starter motor lead – starter
motor
Flywheel magneto – crankshaft
assembly
TIGHTENING TORQUES
Part name
Bolt
1st
Bolt
4th
2nd
Bolt
6th
3rd
Nut
5th
7th
Bolt
9th
8th
Bolt
10th
1st
Nut
2nd
1st
Bolt
2nd
1st
Nut
2nd
1st
Bolt
2nd
1st
Bolt
3rd
2nd
Bolt
4th
1st
Bolt
2nd
Screw
Bolt
Bolt
Bolt
Bolt
Spark plug
1st
Bolt
2nd
1st
Bolt
2nd
Nut
Bolt
Tightening torque
Thread
Q'ty
size
N•m
M8
4
17
2
M10
2
51
2
M10
4
39
2
M10
2
51
2
M10
1
49
2
M10
1
49
15
M8
2
39
15
M8
3
33
15
M10
1
51
17
M8
5
34
2
M10
1
49
2
M8
2
37
23
M10
8
51
M3
16
0.8
M6
2
10
M6
6
10
M5
2
4
M4
2
3
M14
2
25
15
M8
10
37
22
M10
8
39
M6
1
5
M10
1
74
2-7
Remarks
kgf•m
ft•lb
1.7
12
0.2
1.4
5.1
37
0.2
1.4
3.9
28
0.2
1.4
5.1
37
0.2
1.4
4.9
35
0.2
1.4
4.9
35
1.5
11
3.9
28
1.5
11
3.3
24
1.5
11
5.1
37
1.7
12
3.4
24
0.2
1.4
4.9
35
0.2
1.4
3.7
27
2.3
17
5.1
37
0.08
0.58
1.0
7.2
1.0
7.2
0.4
2.9
0.3
2.2
2.5
18
1.5
11
3.7
27
2.2
16
3.9
28
0.5
3.6
7.4
53
E
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