Technical Data - Echo SRM-420ES (L): SRM-420ES (U) Service Data

SRM-420ES

1-2 Technical data

Model
Engine
Idling speed
Wide open throttle speed
Clutch engagement speed
Engagement Limit
Compression pressure
Ignition system with stop holding function
Spark plug gap
Minimum secondary voltage at 1500 r/min
Primary coil resistance
(Red Probe on stop terminal of module)
Secondary coil resistance
Pole shoe air gaps
Ignition timing
Carburettor
Venturi Size
Throttle Bore
Idle adjust screw initial setting
L mixture needle initial setting
H mixture needle initial setting
Test Pressure, minimum
Metering lever height
BTDC: Before top dead centre.
*With Nylon line cutter and shield.
**With 3-tooth blade (255 mm).
*** Set idle adjust screw to the point that its tip just contacts throttle plate before initial setting.
†
If clutch engagement speed is lower than lower service limit speed or higher than uper service limit speed,
replace clutch assembly with new one.
SERVICE INFORMATION
†
MPa (kgf/cm
at 3,000 r/min
at 8,000 r/min
at 10,000 r/min
MPa (kgf/cm
SRM-420ES (L)
r/min
r/min 9,500 - 10,500*
r/min
r/min
2
) (psi)
mm(in)
kV
MΩ
Ω
mm(in)
°BTDC
°BTDC
°BTDC
turns in***
turns out
turns out
2
) (psi)
mm(in) 1.65 (0.06) lower than diaphragm seat
SRM-420ES (U)
2,800 +/- 400
10,500 - 11,500**
3,700
Less 3,300 or over 4,300
0.92 (9.4) (132)
0.6 - 0.7 (0.024 - 0.028)
22
2.4 -2.9
930 - 970
0.3 - 0.4 (0.012 - 0.016)
12
25
23
12.7 (0.50)
14.3 (0.56)
2 1/8
2 3/8
3
0.05 (0.5) (7.0)
3