SERVICE INFORMATION
SRM-420ES
4
1-3 Torque limits
Descriptions Size
kgf•cm
N•m
in•lbf
Starter Pawl
M 8
60 - 90
6 - 9
50 - 80
system Starter case
M 5
30 - 45
3 - 4.5
26 - 40
Ignition Magneto rotor (Flywheel)
M 8
200 - 240
20 - 24
175 - 210
system Ignition coil
M 5
50 - 70
5 - 7
45 - 60
Spark plug
M 14
130 - 170
13 - 17
115 - 150
Fan cover
M 5
30 - 45
3 - 4.5
26 - 40
Fuel
Carburettor
M 5
40 - 55
4 - 5.5
35 - 50
system Intake bellows
M 5
30 - 50
3 - 5
26 - 45
Intake insulator
M 5
50 - 70
5 - 7
45 - 60
Insulator plate
M 5
30 - 45
3 - 4.5
26 - 40
Fuel tank bracket
M 5
50 - 70
5 - 7
45 - 60
Fuel tank
M 5
50 - 70
5 - 7
45 - 60
Clutch Clutch shoe
M 6
70 - 110
7 - 11
60 - 95
Engine Crankcase
M 5**
70 - 110
7 - 11
60 - 95
Cylinder
M 5**
70 - 110
7 - 11
60 - 95
Cylinder cover
M 5
20 - 30
2 - 3
17 - 26
Stand
M 5
20 - 30
2 - 3
17 - 26
Muf
fl
er
M 6
100 - 140
10 - 14
90 - 125
Muf
fl
er cover
M 5*
30 - 45
3 - 4.5
26 - 40
Muf
fl
er stay
M 5
60 - 90
6 - 9
50 - 80
Others Blade fastening nut
LM 10
280 - 320
28 - 32
245 - 280
Regular bolt, nut and screw
M 3
6 - 10
0.6 - 1
5 - 9
M 4
15 - 25
1.5 - 2.5
13 - 22
M 5
25 - 45
2.5 - 4.5
22 - 40
M 6
45 - 75
4.5 - 7.5
40 - 65
M 8
110 - 150
11 - 15
95 - 130
M 10
210 - 300
21 - 30
180 - 260
LM: Left hand thread.* Apply thread locking sealant. (See below)
** The torque differences among four bolts should not exceed 20 kgf• cm (2N•m, 17in•lbf) on one cylinder or
crankcase.
1-4 Special repairing materials
Material
Location
Remarks
Grease Gear
case
Rewind
spring
Lithium based grease or ECHO XTended Protection
TM
Starter center post
Lubricant
Oil
Oil seal inner lips
Two-stroke engine oil or engine oil (SAE#30)
Drive
shaft
Thread locking sealant Muf
fl
er cover
Loctite #242, ThreeBond #1324 or equivalent
