Echo CS-4200ES User Manual download pdf (Page 3)

SERVICE INFORMATION

CS-3700ES

CS-4200ES

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

) (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 kΩ 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

) (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.

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Echo CS-4200ES User Manual Page 3