SERVICE INFORMATION
CS-2510TES
250Ts, 250TCs
3
1-2 Technical data
Engine
Idling speed r/min 2,800 - 3,600
Wide open throttle speed* r/min 12,700 - 13,100
Clutch engagement speed r/min 4,400
Engagement Minimum
†
r/min 3,700
Compression pressure MPa (kgf/cm
2
) (psi) 1.03 (10.5) (150)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Spark test
Spark tester gap w/ spark plug mm(in) 4.0 (0.16)
Spark tester gap w/o spark plug mm(in) 6.0 (0.24)
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 1,000 r/min °BTDC 9
at 3,000 r/min °BTDC 12
at 10,000 r/min °BTDC 29
Carburetor
Throttle adjust screw initial setting turn in** 1 5/8
L mixture needle initial setting turn out 1 7/8
H mixture needle initial setting turn out 2 5/8
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 - 0.46)
(Factory set: 7 mL/min)
mL/min(UK.fl .oz./min)
BTDC: Before top dead centre.
* With 25 cm guide bar and properly tensioned saw chain.
**Set throttle adjust screw to the point that its tip contacts throttle plate before initial setting.
†
If clutch engagement speed is lower than minimum clutch engagement speed, replace clutch assembly with
new one.
Cutting devices
Sprocket nose bar Carving
Guide bar
Type
C20S91-35SA C25S91-40SL C30S91-47ML C20H25-52CL C25H25-60CL
Called length cm 20 25 30 20 25
Gauge in 0.050
Saw chain
Type
Carlton N1C-BL
OREGON 91PX
OREGON 25AP
Number of drive links 35 40 47 52 60
Pitch in 3/8 1/4
Gauge in 0.050
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