3
SERVICE INFORMATION
CS-3000 CS-3050
CS-3400 CS-3450
1-2 Technical data
BTDC: Before top dead center.
*With guide bar and saw chain.
Model CS-3000 CS-3050 CS-3400 CS-3450
Engine
Idling speed rpm 2700 - 3300
Operating speed rpm 6500 - 9000
High speed (No load full throttle)* rpm 11000 - 12000
Clutch-in speed rpm 4100 - 4300
Compression pressure, standard kgf/cm
2
(psi) 8 (115)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage kV 15
Secondary coil resistance kΩ ( 1.0 - 1.5 ) 1.2 - 1.8 ( 1.0 - 1.5 ) 1.2 - 1.8
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 1500 rpm °BTDC ( 27 ) 29 ( 27 ) 11 15
Ignition timing at 3000 rpm °BTDC ( 27 ) 29 ( 27 ) 12.5 16.5
Ignition timing at 7500 rpm °BTDC ( 27 ) 29 ( 27 ) 26 30
Chain oil discharge volume at 7000 rpm
cm
3
/min(U.S.fl.oz./min) 1.5 - 13 (0.05 - 0.45) adjustable
Carburetor Model WT-248 WT-254 WT-261 WT-271 WT-381 WT-385 WT-385A
Supplier & Type Walbro Diaphragm horizontal-draught
Venturi Size mm(in) 9.53 (3/8) 11.11 (3/8) 9.53 (3/8)
Throttle Bore mm(in) 15.85 (5/8) 15.85 (5/8) 14.3 (9/16)
Idle speed screw initial setting turn in
22 2
H needle initial setting turn back 1 1/4 1 1/8 1 1/4
L needle initial setting turn back 1 1/4 1 1/8 1
Test Pressure, minimum kgf/cm
2
(psi)
0.5 (7.0)
Metering lever height mm(in) 1.65 ((0.65) lower than diaphragm seat
Applicable model CS-3000 CS-3050 CS-3450 CS-3400 CS-3050 CS-3000 CS-3000
CS-3450 CS-3400 CS-3050
CS-3400
CS-3450
H needle: High speed needle.
L needle: Idle needle.
1-3 Carburetor data
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