SERVICE INFORMATION
CS-271T
3
1-2 Technicaldata
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
MΩ 2.0 - 2.5
(Red Probe on stop terminal of module)
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
L mixture needle initial setting turns out 2
H mixture needle initial setting turns out 2 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)
(Factory set: 7 mL/min)
mL/min(U.S..oz./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.
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
Oregon Saw chain 91VG as option
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