SERVICE INFORMATION
3
CS-2511WES
251Ws
1-1 Specications (continued)
Cutting devices
Sprocket nose bar
Guide bar Type C20S91-35SA C25S91-40SL C30S91-47ML
Called length cm 20 25 30
Gauge in 0.050
Saw chain Type Carlton N1C-BL, OREGON 91PX
Number of drive links 35 40 47
Pitch in 3/8
Gauge in 0.050
Sprocket Number of teeth 6
Pitch in 3/8
Cutting devices
Carving bar
Guide bar Type
C20SA4-52CL C20HA4-52CL C25SA4-60CL C25HA4-60CL
Called length cm 20 25
Gauge in 0.043
Saw chain Type SUGIHARA A4S
Number of drive links 52 60
Pitch in 1/4
Gauge in 0.043
Sprocket Number of teeth 8
Pitch in 1/4
1-2 Technical data
Engine
Compression pressure MPa (kgf/cm
2
) (psi) 1.03 (10.5) (150)
Clutch engagement speed r/min 4,400
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Spark test Tester gap w/ spark plug mm(in)
4.0 (0.16)
Tester gap w/o spark plug mm(in) 6.0 (0.24)
Secondary coil resistance Ω 960 - 1,000
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
9
at 10,000 r/min °BTDC
30
Carburetor
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
Tool to adjust mixture needles D-shaped tool (L) P/N X645-000031
Chain oil discharge volume
Adjustable: 1.5 - 13 (0.05 - 0.46)
(Factory set: 6 mL/min)
mL/min (UK..oz./min)
BTDC: Before top dead center
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