Echo CS-271T Service Manual - page 3
3
CS-271T
SERVICE INFORMATION
Oregon Saw chain 91VG as option
Cutting devices
Guide bar
Part No.
10A0CD3740
12A0CD3745
Called length
in
10
12
Gauge
in
0.050
Saw chain
Number of drive links
40
45
Pitch
in
3/8
Gauge
in
0.050
1-2 Technical data
Engine
Idling speed
RPM
3,200 +/- 300
Wide open throttle speed*
RPM
11,300 - 12,500
Clutch engagement speed
RPM
4,400
Engagement Minimum
†
RPM
3,800
Compression pressure
MPa (kgf/cm
2
) (psi)
0.85 (8.7) (124)
Ignition system
Spark plug gap
mm(in)
0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1,500 RPM
kV
17
Primary coil resistance
(Red Probe on stop terminal of module)
M
Ω
2.0 - 2.5
Secondary coil resistance
Ω
930 - 970
Pole shoe air gaps
mm (in)
0.3 - 0.4 (0.012 - 0.016)
Ignition timing
at 3,000 RPM
°BTDC
16
at 8,000 RPM
°BTDC
31
at 10,000 RPM
°BTDC
32
Carburetor
Idle adjust screw initial setting
turns in**
7
/
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
Adjustable: 1.5 - 13 (0.05 - 0.40)
mL/min(U.S.fl.oz./min)
(Factory set: 7 mL/min)
BTDC: Before top dead center.
* With 12 in. guide bar and properly adjusted saw chain.
**Set idle adjust screw to the point that its tip contacts throttle plate before initial setting.
†
If clutch engagement speed is lower than minimum RPM, replace clutch assembly with new one.