SRM-420ES, SRM-420TES
T410S, B410S
T410TS, B410TS
2
SERVICE INFORMATION
2
1 SERVICE INFORMATION
1-1 Specifi cations
Model
SRM-420ES (L) SRM-420ES (U)
T410S B410S
Dimensions*
1
Length mm (in) 1840 (72.4)
Width mm (in) 355 (14.0) 700 (27.6)
Heigh mm (in) 287 (11.3) 585 (23.0)
Dry weight*
2
kg (lb) 7.8 (17.2) 8.5 (18.7)
Engine Type YAMABIKO, air-cooled, two-stroke, single cylinder
Rotation Counterclockwise as viewed from the output end
Displacement cm
3
(in
3
) 41.5 (2.532)
Bore mm (in) 40.0 (1.575)
Stroke mm (in) 33.0 (1.299)
Compression ratio 6.7
Carburetor Type Rotary type : Diaphragm, horizontal-draft with purge bulb
Model WT-1046
WT-1046
WT-1170
Venturi size-Throttle bore mm (in) 12.7 - 14.3 (0.50 - 0.56)
Ignition Type CDI (Capacitor discharge ignition) system, Digital magneto
Spark plug BPMR8Y
Exhaust Muffl er type Spark arrester muffl er with catalyst
Starter Type ES-start (effortless) / Soft Start
Rope diameter x length mm (in) 3.8 x 910 (0.15 x 35.9)
Fuel*
3
Type*
4
Mixed two-stroke fuel
Mixture ratio 50 : 1 (2%)
Gasoline Minimum 89 octane
Two-stroke engine oil ISO-L-EGD (ISO/CD13738), JASO FC/FD
Tank capacity Full tank capacity: 0.69 (23.3)
L (U.S.fl .oz.) Usable capacity: 0.60 (20.3)
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
Cutter Type Nylon line cutter DS-5
3-tooth blade (255 mm)
Nylon line cutter DS-5
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 Counterclockwise as viewed from top
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