Echo CS-420ES - Manual (Page 3)

SERVICE INFORMATION CS-420ES
3
1-2 Technical data
Engine
Idling speed r/min 2400 - 2900
Wide open throttle speed* r/min 12300 - 13000
Clutch engagement speed r/min 3800 - 4300
Compression pressure MPa (kgf/cm 2 ) (psi) 0.84 (8.6) (122)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1000 r/min kV 15
Primary coil resistance Ω 200 - 400
Secondary coil resistance kΩ 1.5 - 2.2
Pole shoe air gaps mm (in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 3000 r/min °BTDC 10
at 8000 r/min °BTDC 32
at 10,000 r/min °BTDC 34
at 12,000 r/min °BTDC 15
Carburettor
Idle adjust screw initial setting
turns in** 1 3/8
L mixture needle initial setting turns back 1 3/8
H mixture needle initial setting turns back 2 3/4
Test Pressure, minimum MPa (kgf/cm 2 ) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 1.65 (0.06) lower than diaphragm seat
Chain oil discharge volume at 7000 r/min Adjustable : 1.5 - 13 (0.05 - 0.40)
mL/min(U.S.fl .oz./min) (Factory set 7 mL/min)
BTDC: Before top dead centre.
* With 38/45 cm guide bar and saw chain.
**Set idle adjust screw to the point that its tip just contacts throttle plate before initial setting.