Echo CS-271T User manual

2 CARBURETOR ADJUSTMENT PROCEDURE .... 7
2-1 General adjusting rules............................... 7
2-2 Presetting Idle adjust screw, L mixture
needle
and H mixture needle ........................................ 7
2-3 Adjusting carburetor.................................... 9
00-27A-00 CS-271T 1
0
SERVICE
MANUAL
SUPPLEMENT
CHAIN SAW
ECHO:
CS-271T
(Serial number : 11000001-11999999)
(Serial
number : 12000001-12999999)
(Serial number : 13000001-13999999)
INTRODUCTION CONTENTS
page
We are constantly working on technical im-
provement of our products. For this reason,
technical data, equipment and design are
subject to change without notice. All speci-
fications and directions in this SERVICE
MANUAL SUPPLEMENT are based on the
latest product information available at the
time of publication.
1 SERVICE INFORMATION.............................. 2
1-1 Specification ............................................... 2
1-2 Technical data............................................. 3
1-3 Torque limits................................................ 4
1-4 Special repairing materials ......................... 4
1-5 Service limits............................................... 5
1-6 Special tools ............................................... 6
Reference No. 00-27A-00
ISSUED: 201 105

2
SERVICE INFORMATION
CS-271T
Cutting devices
Guide bar
Part No. 10A4CD3740 12A4CD3745
Called length in
10
12
Gauge in 0.043
Saw chain
Number of drive links
40
45
Pitch in 3/8
Gauge in
0.043
1 SERVICE
INFORMA TION
1-1
Speci fi cations
Model CS-271T
Dimensions Length* mm(in) 257 (10.12)
Width mm(in) 228 (8.98)
Height mm(in) 210 (8.27)
Dry weight* kg(lb) 3.0 (6.6)
YAMABIKO, air-cooled, two-stroke, single cylinder
Engine Type
gasoline engine
Rotation Clockwise as viewed from the output end
Displacement cm3(in3) 26.9 (1.641)
Bore mm(in) 35.0 (1.378)
Stroke mm(in) 28.0 (1.102)
Compression ratio 6.6
Carburetor Type Diaphragm horizontal-draft
Model Walbro WT-1008
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 BPM8Y (CANADA: BPMR8Y)
Starter Type Automatic rewind starter
Rope diameter x length mm(in) 3.5x700 (0.14x27.6)
Fuel Type Premixed two-stroke fuel
Mixture ratio 50 : 1 (2 %)
Gasoline Minimum 89 octane gasoline
Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO M345-FC/FD
Tank capacity L (U.S.fl.oz.) 0.24 (8.1)
Exhaust Muffler type
Spark arrester muffler
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 (U.S.fl.oz.) 0.16 (5.4)
Auto oiler Type
Clutch related type
Sprocket Type
Spur
Number of teeth
6
Pitch
in
3/8
* Without guide bar and saw chain.
Oregon Saw chain 90SG

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/cm2) (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) MΩ2.0 - 2.5
Secondary coil resistance Ω930 - 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/cm2) (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.

4
SERVICE INFORMATION
CS-271T
1-3 Torque
limits
Descriptions Size kgf•cm
N•m in•lbf
Starter
system
Starter pawl M5* 30 - 45
3 - 4.5 25 - 40
Starter case M5 10 - 20
1 - 2 9 - 18
Ignition
system
Magneto rotor (Flywheel) M8 250 - 290
25 - 29 220 - 255
Ignition coil M4* 30 - 45
3 - 4.5 25 - 40
ON-OFF switch M3* 3 - 5
0.3 - 0.5 3 - 4
Spark plug M14 130 - 170
13 - 17 113 - 150
Fuel
system
Carburetor M5 30 - 45
3 - 4.5 25 - 40
Intake bellows M4 35 - 50
3.5 - 5 30 - 45
Clutch Clutch hub LM10 230 - 260
23 - 26 200 - 230
Engine
Crankcase M5* 55 - 95
5.5 - 9.5 48 - 85
Engine mount M5 70 - 110
7 - 11 60 - 95
Dust cover M4 10 - 20
1 - 2 9 - 18
Eye plate M4 10 - 20
1 - 2 9 - 18
Muffler M5 70 - 100
7 - 10 60 - 90
Muffler cover M5 10 - 20
1 - 2 9 - 18
Others
Exhaust guide M4 15 - 25
1.5 - 2.5 13 - 22
Auto-oiler M4 20 - 35
2 - 3.5 18 - 30
Front handle M5 20 - 40
2 - 4 18 - 35
Top handle M4 10 - 20
1 - 2 9 - 18
Top handle assembly M4 20 - 30
2 - 3 18 - 25
Cushion M4 10 - 20
1 - 2 9 - 18
Brake cover M4 10 - 20
1 - 2 9 - 18
Sprocket guard plate M4 10 - 20
1 - 2 9 - 18
Brake lever (Hand guard) M5 25 - 45
2.5 - 4.5 22 - 40
Chain catcher M5 20 - 40
2 - 4 18 - 35
Guide bar stud M8 180 - 250
18 - 25 160 - 220
Bolt (at guide bar mount) M4 20 - 40
2 - 4 18 - 35
Regular bolt, nut and screw
M3 6 - 10
0.6 - 1 5 - 9
M4 15 - 25
1.5 - 2.5 13 - 22
M5 25 - 45
2.5 - 4.5 22 - 40
M6 45 - 75
4.5 - 7.5 40 - 65
LM: Left-hand thread *Apply special repairing materials
1-4 Special
repairing materials
Material
Location
Remarks
Adhesive
Ball bearing outer / crankcase
Loctite #675 or equivalent
Liquid gasket
Crankcase seams
ThreeBond 1207D
Thread locking sealant
Starter pawl
Loctite #222, ThreeBond #1342 or equivalent
Ignition coil
ON-OFF switch
Loctite #242, ThreeBond #1324 or equivalent
Grease
Clutch needle bearing
Lithium based grease or ECHO XTended
Protection TM Lubricant
Rear handle cushion
Collar
Starter grip rope guide
Oil seal lip
Chain brake (metal contact part)
Molybdenum grease (approx.1 gram)

5
CS-271T
SERVICE INFORMATION
5K097
1-5 Service
Limits
A B C D
5K177 5K083 5K084 5K081
E F G H
5K082 5K016 5K025 5K178
K L M P
N
5K173
5K174 5K190
5K191
Description mm (in)
A Cylinder bore When plating is worn and aluminum can be seen
B Piston outer diameter Min. 34. 91 (1.374)
C Piston pin bore Max. 8. 035 (0.3163)
D Piston ring groove Max. 1. 6 (0.063)
E Piston ring side clearance Max. 0. 1 (0.004)
F Piston pin outer diameter Min. 7. 98 (0.3142)
G Piston ring width Min. 1. 45 (0.057)
H Piston ring end gap Max. 0. 5 (0.02)
K Con-rod small end bore Max. 12. 00 (0.4724)
L Crankshaft runout
Max. 0. 02 (0.001)
M Sprocket bore
Max. 12. 80 (0.5039)
N Clutch drum bore Max. 55. 5 (2.19)
P Sprocket wear limit Max. 0. 5 (0.02)

6
SERVICE INFORMATION
CS-271T