SERVICE INFORMATION
CS-4400
CS-5100
3
1-2 Technical data
Model CS-4400 CS-5100
Engine
Idling speed r/min 2300 - 2800 2300 - 2800
Operating speed* r/min 9500 - 10500 10500 - 11000
High speed (No load full throttle)* r/min 11500 - 13000 12500 - 13500
Clutch engagement speed* r/min 3500 - 4000 3500 - 4000
Compression pressure MPa (kgf/cm
2
) (psi) 1.05 (10.5) (146) 1.00 (10.2) (145)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage
kV 14.5 23.0
(CS-4400 at 800 r/min, CS-5100 at 1500 r/min)
Secondary coil resistance kΩ 1.7 - 2.2
Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016)
Ignition timing at 800 r/min °BTDC 14.5 ---
at 1500 r/min °BTDC --- 17
at 3000 r/min °BTDC 18.5
at 10000 r/min °BTDC 28
Carburettor
Idle adjust screw initial setting turns in** 1 1/2 2
L mixture needle initial setting turns back 1 1/4 1 1/2
H mixture needle initial setting turns back 3 2 1/4
Test Pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 1.65 (0.065) 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 guide bar and saw chain.
**Set idle adjust screw to contact throttle plate before initial setting.
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