5
SRM-420ES, SRM-420TES
T410S, B410S
T410TS, B410TS
SERVICE INFORMATION
5
1-3 Torque limits
Descriptions Size kgf•cm N•m in•lbf
Starter system Pawl
M5 60
-
90 6
-
950
-
80
Starter case
M5*
3
30
-
45 3
-
4.5 26
-
40
Ignition system Magneto rotor (Flywheel)
LM8 200
-
240 20
-
24 175
-
210
Ignition coil
M5 50
-
70 5
-
745
-
60
Spark plug
M14 130
-
170 13
-
17 115
-
150
Fan cover
M5 50
-
70 5
-
745
-
60
Fuel system Carburetor
M5 40
-
55 4
-
5.5 35
-
50
Intake bellows
M5*
3
30
-
50 3
-
526
-
45
Intake insulator
M5*
3
50
-
70 5
-
745
-
60
Insulator plate
M5*
3
30
-
45 3
-
4.5 26
-
40
Fuel tank bracket
M5 50
-
70 5
-
745
-
60
Fuel tank
M5 50
-
70 5
-
745
-
60
Clutch Clutch shoe
M6 70
-
110 7
-
11 60
-
95
Engine Crankcase
M5*
2
70
-
110 7
-
11 60
-
95
Cylinder
M5*
2
70
-
110 7
-
11 60
-
95
Cylinder cover
M5*
3
20
-
30 2
-
317
-
26
Inner cylinder cover
M5*
3
30
-
45 3
-
4.5 26
-
40
Stand
M5*
3
20
-
30 2
-
317
-
26
Muffler
M6 100
-
140 10
-
14 90
-
125
Muffler cover
M5*
1
30
-
45 3
-
4.5 26
-
40
Muffler stay
M5 60
-
90 6
-
950
-
80
Others Blade fastening nut
LM10 280
-
320 28
-
32 245
-
280
Regular bolt, nut, and screw
M3 6
-
10 0.6
-
15
-
9
M4 15
-
25 1.5
-
2.5 13
-
22
M5 25
-
45 2.5
-
4.5 22
-
40
M6 45
-
75 4.5
-
7.5 40
-
65
M8 110
-
150 11
-
15 95
-
130
M10 210
-
300 21
-
30 180
-
260
LM: Left hand thread.
*
1
Apply thread locking sealant. (See “
1-4 Special repairing materials”
)
*
2
The torque differences among four bolts should not exceed 20 kgf•cm (2N•m, 17in•lbf) on one cylinder or
crankcase.
*
3
Precoat bolt: If old thread locking sealant is left in threads, correct torque may not be secured. In case old
thread locking sealant is left, remove it .
1-4 Special repairing materials
Material Location Remarks
Grease Gear case
Lithium based grease
Rewind spring
Starter center post
Oil Oil seal inner lips
Two-stroke engine oil or engine oil (SAE#30)Intake bellows lips
Drive shaft
Thread locking sealant Muffl er cover
Loctite #242, ThreeBond #1324 or equivalent
Ignition switch
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