SERVICE INFORMATION
CS-2511TES
251Ts, 251TCs
2
1 SERVICE INFORMATION
1-1 Specifications
Dimensions Length*
mm(in)
243 (9.57)
Width
mm(in)
205 (8.07)
Height
mm(in)
196 (7.72)
Dry weight*
kg(lb)
2.3 (5.1)
Engine
Type
YAMABIKO, air-cooled, two-stroke, single cylinder
Rotation
Clockwise as viewed from the output end
Displacement
cm
3
(in
3
)
25.0 (1.525)
Bore
mm(in)
35.0 (1.378)
Stroke
mm(in)
26.0 (1.024)
Compression ratio
7.9
Carburetor Type
Diaphragm horizontal-draught with separated primer
Model
Walbro WT-1153 (CS-2511TES)
WT-1155 (251Ts, 251TCs)
with Large D-shaped mixture needles
Venturi size-Throttle bore
mm(in)
11.11-14.3 (0.437-0.563)
Ignition
Type
CDI (Capacitor discharge ignition) system
Digital magneto
Spark plug
CMR7H
Starter
Type
ES (effortless)-start / S(Soft)-start
Rope diameter x length
mm(in)
3.0 x 720 (0.12 x 28.3)
Fuel
Type
Premixed two-stroke fuel
Mixture ratio
50 : 1 (2 %)
Petrol
Minimum 89 octane petrol
Two-stroke air cooled engine oi
l
ISO-L-EGD (ISO/CD13738), JASO FC/FD
Tank capacity
L (UK.fl.oz.)
0.19 (6.7)
Exhaust
Muffler type
Spark arrester muffler with catalyst
Clutch
Type
Centrifugal type, 3-shoe slide with 3-tension spring
Guide bar / Saw chain lubrication type
Adjustable automatic oil pump
Oil
Tank capacity
L (UK.fl.oz.)
0.14 (4.9)
Auto oiler
Type
Clutch related type
Sprocket
Type
Spur
Number of teeth
6 (Sprocket nose bar), 8 (Carving bar)
Pitch
in
3/8 (Sprocket nose bar), 1/4 (Carving bar)
Spike
Option (Parts number: P200-000150)
* Without guide bar and saw chain.
Cutting devices
Sprocket nose bar
Carving bar
Guide bar
Type
C20S91-35SA C25S91-40SL C30S91-47ML C20H25-52CL
C25H25-60CL
:CS-2511TES only
C25H25-60CLD
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