SERVICE INFORMATION
SRM-420ES
2
1 SERVICE INFORMATION
1-1 Speci
fi
cations
Model
SRM-420ES (L)
SRM-420ES (U)
Dimentions*
Length
mm (in)
1840 (72.4)
Width
mm (in)
355 (14.0)
680 (26.8)
Heigh
mm (in)
287 (11.3)
510 (20.1)
Dry weight*
kg (lb)
8.3 (18.2)
8.8 (19.3)
Engine
Type
YAMABIKO, air-cooled, two-stroke, single cylinder
Rotation
Anticlockwise as viewed from the output end
Displacement
cm
3
(in
3
)
41.5 (2.53)
Bore
mm (in)
40.0 (1.58)
Stroke
mm (in)
33.0 (1.30)
Compression ratio
6.7
Carburettor Type
Rotary type : Diaphragm, horizontal-draught, with primer
Model
WALBRO WT-1046
Ignition
Type
CDI (Capacitor discharge ignition) system
Digital magneto
Spark plug
BPMR8Y
Exhaust
Muf
fl
er type
Spark arrester muf
fl
er with catalyst
Starter
Type
ES (effortless-start)
Rope diameter x length mm (in)
3.8 x 910 (0.15 x 35.9)
Fuel**
Type
Premixed two-stroke fuel
Mixture ratio
50 : 1 (2%)
Petrol
Minimum 89 octane
Two-stroke engine oil
ISO-L-EGD (ISO/CD13738), JASO FC/FD
Tank capacity
L (U.S.
fl
.oz.)
0.68 (23.0)
Clutch
Type
Centrifugal, 2-shoe pivot
Handle
Type
Front : Crescent loop with cushion grip
U-handle with integrated
control grip
Rear : Integrated control grip with cushion
Drive shaft
Type
Solid type with serration (10-tooth)
Diameter - Length
mm (in)
8.0 - 1588 (0.31 - 62.52)
Housing
OD - ID mm (in)
28.0 - 24.0 (1.10 - 0.94)
Main pipe
Length
mm (in)
1537 (60.5)
Gear case
Reduction ratio
1.33
Gear tooth
Spiral bevel gear
Lubrication
Lithium based grease or ECHO XTended Protection
TM
Lubricant
Cutter
Type
Nylon line cutter
3-tooth blade (255 mm)
Arbor diameter for blade
mm (in)
25.4 (1.0)
Fastener type, size
mm
Left-hand thread nut, M10 x 1.25 pitch
Cutting rotation
Anticlockwise as viewed from top
OD: Outer diameter. ID: Inner diameter. * Without shoulder harness and standard cutter.
** Refer to Operator’s manual.
