Echo CS-4200ES - Manual (Page 3)

SERVICE INFORMATION
CS-3700ES
CS-4200ES 3
1-2 Technical data
Model CS-3700ES CS-4200ES
Engine
Idling speed r/min 2300 - 3000
Operating speed* r/min 8500 - 9000
High speed (No load full throttle)* r/min 11500 - 12500
Clutch engagement speed* r/min 3500 - 4300
Compression pressure MPa (kgf/cm 2 ) (psi) 1.0 (10) (145) 1.15 (11.5) (165)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1000 r/min kV 15
Secondary coil resistance k
Ω
1.7 - 2.2
Pole shoe air gaps mm (in) 0.35 - 0.45 (0.014 - 0.018)
Ignition timing at 1500 r/min
°
BTDC 25
Carburettor WT-416C WT-812 WT-594
Idle adjust screw initial setting turns in** 1 1/8 1 3/4 1 3/8
L mixture needle initial setting turns back 1 1/4 1 1/4
H mixture needle initial setting turns back 3 3 1/2 2 5/8
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 38cm guide bar and saw chain.
**Set idle adjust screw to contact throttle plate before initial setting.