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
k
Ω
( 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
2
2
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
