Echo CS-420ES

SERVICE INFORMATION
CS-370ES
CS-420ES
3
1-1 Specifications (continued)
Cutting devices CS-420ES
Guide bar Part No. 38RD58-325 43RD58-325
Called length cm 38 43
Gauge in 0.058
Saw chain Type CARLTON K2L OREGON 21BP
Number of drive links 64 72
Pitch in 0.325
Gauge in 0.058
1-2 Technical data
Model CS-370ES CS-420ES
Engine
Idling speed rpm 2400 - 2900 2400 - 2900
Wide open throttle speed* rpm 11500 - 12500 12300 - 13000
Clutch engagement speed rpm 3800 - 4300 3800 - 4300
Compression pressure MPa (kgf/cm
2
) (psi) 1.02 (10.4) (148) 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 rpm kV 15
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 3,000 rpm °BTDC 10 10
at 8,000 rpm °BTDC 32 32
at 10,000 rpm °BTDC 34 34
at 12,000 rpm °BTDC 15 15
Carburetor
Idle adjust screw initial setting turns in** 1 5/8 1 3/8
L mixture needle initial setting turns back 1 1/4 1 3/8
H mixture needle initial setting turns back 2 3/8 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 rpm Adjustable : 1.5 - 13 (0.05 - 0.40)
mL/min(U.S.fl.oz./min) (Factory set 7 mL/min)
BTDC: Before top dead center.
* With 35/38 cm guide bar and saw chain.
** Set idle adjust screw to contact throttle plate before initial setting.