Echo CS-260TES User manual

00-26C-01 1
INTRODUCTION
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, illustrations and directions in this
SERVICE DATA are based on the latest
products information available at the time
of publication.
ECHO SERVICE MANUAL Ord.
401-22(Model : CS-2600) contains lots of
information for servicing this model.
0
CONTENTS
page
1 SERVICE INFORMATION.............................. 2
1-1 Specification ............................................... 2
1-2 Technical data............................................. 3
1-3 Torque limits................................................ 4
1-4 Special repairing materials ......................... 5
1-5 Service limits............................................... 6
1-6 Special tools ............................................... 7
2
CARBURETTOR ADJUSTMENT PROCEDURE ........ 8
2-1 General adjusting rules .............................. 8
2-2 Presetting idle adjust screw, L mixture needle
and H mixture needle ...................................... 8
2-3 Adjusting carburettor ................................ 10
Reference No. 00-26C-01
REVISED: 200804
ISSUED: 200703

SERVICE INFORMATION
CS-260TES
CS-270WES
2
1 SERVICE INFORMATION
1-1 Specifications
Model CS-260TES CS-270WES
Dimensions Length* mm(in) 257 (10.1) 380 (15.0)
Width mm(in) 219 (8.6) 220 (8.7)
Height mm(in) 210 (8.3) 230 (9.1)
Dry weight* kg(lb) 2.9 (6.3) 3.1 (6.8)
Engine Type KIORITZ, air-cooled, two-stroke, single cylinder
Rotation Clockwise as viewed from the output end
Displacement cm3(in3) 26.9 (1.641)
Bore mm(in) 35 (1.378)
Stroke mm(in) 28 (1.102)
Compression ratio 6.4
Carburettor Type Diaphragm horizontal-draught with auto-return choke
Model (Walbro) WT-843 WT-845
Venturi size-Throttle bore mm(in) 9.53 - 14.3 (0.375 - 0.563)
Ignition Type Digital Magneto : CDI system
Spark plug BPMR-7A
Starter Type ES (Effortless)-start
Rope diameter x length mm(in) 3.5 x 750 (0.14 x 29.5)
Fuel Type Premixed two-stroke fuel
Mixture ratio 50 : 1 (2 %)
Petrol Minimum 89 octane petrol (RON)
Two-stroke air cooled engine oilISO-L-EGD (ISO/CD13738), JASO FC
Tank capacity L (U.S.fl.oz.) 0.24 (8.1)
Clutch Type Centrifugal, 3-shoe slide with 3-tension spring
Guide bar / Saw chain lubrication type Automatic with volume adjuster
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 (Sproket nose bar), 8 (for Carving bar)
Pitch in 3/8 (Sproket nose bar), 1/4 (for Carving bar)
Cutting devices Sproket nose bar Carving
Guide bar Type 20RC50-3/8 25RC50S-3/8 30RC50M-3/8 25C50
Called length cm 20 25 30 25
Gauge in 0.050
Saw chain Number of drive link 35 40 47 60
Pitch in 3/8 1/4
Gauge in 0.050
* Without guide bar and saw chain.

SERVICE INFORMATION
CS-260TES
CS-270WES 3
1-2 Technical data
Model CS-260TES CS-270WES
Engine
Idling speed r/min 2800 - 3600
Operating speed r/min 8500 - 9000
High speed (No load full throttle)* r/min 11000 - 12500
Clutch engagement speed r/min 4450 - 4750
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 1500 r/min kV 15
Secondary coil resistance kΩ1.2 - 1.8
Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016)
Ignition timing at 1500 r/min °BTDC 25
at 3000 r/min °BTDC 20
at 8000 r/min °BTDC 36
at 12000 r/min °BTDC 25
Carburettor
Idle adjust screw initial setting turns in** 2 1/8
L mixture needle initial setting turns back 1 5/8
H mixture needle initial setting turns back 1 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 at 7000 r/ min Adjustable: 1.5 - 13 (0.05 - 0.40)
mL/min(U.S.fl.oz./min) (Factory set 7 mL/min)
BTDC: Before top dead centre.
*With 25cm guide bar and saw chain.
** Set idle speed screw to the point that its tip just contacts throttle plate before initial setting.

SERVICE INFORMATION
CS-260TES
CS-270WES
4
1-3 Torque limits
Descriptions Size kgf•cm N•m in•lbf
Starter Starter pawl M5* 40 - 60 4 - 6 35 - 50
system Starter case M 4** 10 - 20 1 - 2 9 - 18
Ignition Magneto rotor (Flywheel) M 8 160 - 200 16 - 20 140 - 175
system Ignition coil M 5* 30 - 45 3.0 - 4.5 26 - 40
Spark plug M 14 130 - 170 13 - 17 115 - 150
Fuel Carburettor M 5 30 - 45 3.0 - 4.5 26 - 40
system Intake bellows M 5 35 - 50 3.5 - 5.0 30 - 44
Clutch Clutch hub LM 10 230 - 260 23 - 26 200 - 230
Engine Crankcase M 5*†55 - 95 5.5 - 9.5 48 - 83
Engine mount M 5 70 - 110 7 - 11 60 - 95
Dust cover
(Only CS-260TES)
M 4** 10 - 20 1 - 2 9 - 18
Muffler M 5 70 - 100 7 - 10 60 - 90
Muffler cover M 4** 10 - 20 1 - 2 9 - 18
Others Auto-oiler M 4 15 - 25 1.5 - 2.5 13 - 22
Front handle M 5** 20 - 40 2 - 4 18 - 35
(CS-260TES) M 4** 10 - 20 1 - 2 9 - 18
(CS-270WES) M 4** 8 - 12 0.8 - 1.2 7 - 10
Top handle (CS-260TES) M 4** 10 - 20 1 - 2 9 - 18
Rear handle (CS-270WES) M 4** 10 - 20 1 - 2 9 - 18
Top handle assembly M 4** 20 - 30 2 - 3 18 - 26
(CS-260TES)
Rear handle assembly M 4** 20 - 30 2 - 3 18 - 26
(CS-270WES)
Brake lever (Hand guard) M 5 25 - 45 2.5 - 4.5 22 - 40
Chain catcher M 5** 20 - 40 2 - 4 18 - 35
Guide bar stud M 8 180 - 250 18 - 25 130 - 220
Guide bar M 8 200 - 230 20 - 23 175 - 200
Regular bolt, nut and screw M 3 6 - 10 0.6 - 1.0 5 - 9
M 4 15 - 25 1.5 - 2.5 13 - 22
M 5 25 - 45 2.5 - 4.5 22 - 40
M 6 45 - 75 4.5 - 7.5 40 - 65
LM: Left-hand thread *Apply thread locking sealant (See next page) ** Tapping screw
†The torque differences among four bolts should not exceed 20 kgf•cm (2Nm, 17in•lbf) on one cylinder or
crankcase.

SERVICE INFORMATION
CS-260TES
CS-270WES 5
1-4 Special repairing materials
Material Location Remarks
Adhesive Ball bearing outer / crankcase Loctite #675 or equivalent
Liquid gasket Crankcase seams Loctite #515: 990610-00051 or equivalent
Thread locking sealant Starter pawl screws Loctite #242, Three bond 1324 or equivalent
Ignition coil Loctite #222, Three bond 1342 or equivalent
Crankcase bolts
Grease Auto-oiler worm
Clutch needle bearing
Rear handle cushion Lithium based grease
Rewind spring
Starter center shaft
Chain brake (metal contact part) Molybdenum grease (approx. 1 gram)

SERVICE INFORMATION
CS-260TES
CS-270WES
6
1234
1-5 Service Limits
mm (in)
A Cylinder bore When plating is worn and aluminium can be seen
B Piston outer diameter Min. 34.91 (1.374)
C Piston pin bore Max. 8.030 (0.3161)
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. 7.980 (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. 11.025 (0.4341)
L Crankshaft runout Max. 0.02 (0.001)
M Sprocket bore Max. 0.05 (0.0020)
N Clutch drum bore Max. 55.5 (2.19)
P Sprocket wear limit Max. 0.5 (0.02)
ABCD
FGH
LMP
N
E
K

SERVICE INFORMATION
CS-260TES
CS-270WES 7
1.35
0.4
1.65
1.5
ba
26002600
IgnitionAir Gap Gauge
#.014 = .35mm
P/N 91004
91019
0
0.4
50 50
0.8 0.8
1.2 1.2
1. 1.
MPa MPa
0
1-6 Special tools
145 2
69
10 11
14
12
15 16 19 20
3
8
Key Part Number Description Used for:
1 897801-33330 Tachometer PET-1000 Measuring engine speed to adjust carburettor
2 895612-79920 L-hex wrench (3 mm) Removing and installing hex. socket bolt (M4)
3 895610-79920 L-hex wrench (4 mm) Removing and installing hex. socket bolt (M5)
4 897559-02831 T-hex wrench (4 mm) Removing and installing hex. socket bolt (M5)
5 897501-03938 Puller Removing magneto rotor
6 897702-30131 Piston pin tool Removing and installing piston pin
7 897701-06030 Bearing wedge Removing and crankshaft ball bearings
8 897705-11520 Bearing tool Replacing needle bearing on con-rod small end
9 897563-19830 Metering lever gauge Measuring metering lever hight on carburettor
10 897708-19835 Worm puller Removing auto-oiler worm
11 Y089-000010 Worm inserter Installing auto-oiler worm
12 897726-09130 Oil seal tool Installing oil seals
13 897800-79931 Spark tester Checking ignition system
14 897803-30132 Pressure tester Testing carburettor and crankcase leakage
15 X640-000011 Clutch tool Removing and assembling clutch assembly
16 897826-16131 Pressure rubber plug Plugging intake port to test crankcase / cylinder leakages
17 897828-12330 Pressure rubber plug Plugging intake port to test crankcase / cylinder leakages
18 897835-16131 Pressure connector Checking crankcase and cylinder leakages
19 91037 Compression gauge Measuring cylinder compression
20 91004 Module air gap gauge Adjusting pole shoe air gaps
21 91019 Limiter cap tool Removing and installing limiter cap
a = 3 mm
a = 4 mm
7
18
13
21
17

SERVICE INFORMATION
CS-260TES
CS-270WES
8
2 CARBURETTOR ADJUSTMENT PROCEDURE
2-1 General adjusting rules
A. Before starting the unit for adjustment, check the following items.
1. The correct spark plug must be clean and properly gapped.
2. The air filter element must be clean and properly installed.
3. The muffler exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel filter are in good condition and clear of debris.
5.
The fuel is fresh ( > 89 octane : RON) and properly mixed at 50 : 1 with “ISO L-EGD” or “JASO FC” 2-stroke
oil.
6. The recommended bar and chain must be installed to the power head, and properly tensioned.
NOTE : Make sure of proper installation of guide bar and saw chain when adjusting carburettor, or
serious engine damage will occur due to overspeeding.
B. Adjust carburettor turning L and H mixture needles with limiter caps within the moving range (approx.
90°) and idle adjust screw. When engine does not run correctly after this adjustment, proceed to the next
step (2-2).
C. After adjusting carburettor according to the steps 2-2 and 2-3, the limiter cap(s) must be installed on L
and/or H mixture needle(s) to comply with Emission Directive.
2-2 Presetting idle adjust screw, L mixture needle and H mixture needle
Tools Required : Small screwdriver with 2.5 mm
blade, electronic tachometer P/N 897801-33330,
limiter cap removal tool with 2.5 mm left-hand
thread P/N 91019. Parts Required : (2) limiter caps
P/N P003-000010.
1. Turn the L and H mixture needles anticlockwise
to rich side stop and meet limiter caps tabs (A) with
locating slot (B), using 3 mm blade screw driver.
2. Screw left hand thread of limiter cap tool 91019
into centre hoIe of limiter cap anticlockwise until
tab of the limiter cap just come out from locating
slot.
NOTE : If cap tabs (A) misalign with locating slots
(B), there is a chance to strip thread. When the
thread is stripped by limiter cap tool, screw 3 mm
wood screw in the stripped centre hole of the lim-
iter cap, and pull off the cap.
H
L
(A)
(B)
(B)
(A)
(continued)

SERVICE INFORMATION
CS-260TES
CS-270WES 9
3. Remove the limiter cap tool from the limiter cap
turning the tool clockwise as the limiter cap is re-
mained there.
NOTE : If the limiter cap were pulled out complete-
ly, there is a chance that the other mixture needle
would turn and limiter cap tab would misalign with
locating slot when screwing the limiter cap tool into
centre hole of the other limiter cap.
4. Screw thread of limiter cap tool 91019 into other
centre hole of the other limiter cap anticlockwise
until the limiter cap is come out from the mixture
needle completely. Remove the limiter cap from
limiter cap tool turning clockwise. Screw thread of
limiter cap tool 91019 into centre hole of previous
limiter cap to pull out completely.
5. Turn L and H mixture needle clockwise until
lightly seated, and then turn both mixture needles
anticlockwise following turns.
L mixture needle : 1 5/8, H mixture needle : 1 7/8
NOTE : If needles are forced during seating, dam-
age to carburettor may occur.
6. CS-260TES : Remove cleaner lid and cleaner
case to confirm throttle plate on carburettor visu-
ally. CS-270WES : Remove cleaner lid to confirm
throttle plate on carburettor visually.
7. Turn idle adjust screw anticlockwise and set
the screw until the tip to just contact throttle plate.
Then turn idle adjust screw 2 1/8 turns clockwise.
Install all removed parts.
2-2 Presetting idle adjust screw, L mixture needle and H mixture needle (continued)

SERVICE INFORMATION
CS-260TES
CS-270WES
10
2-3 Adjusting carburettor
1. Start engine and warm it up well for 70 seconds
as follows.
(1) 5 seconds at idle and 5 seconds at WOT.
(2) 5 seconds at idle and 5 sedonds at WOT.
(3) 5 seconds at idle and 10 seconds at WOT.
Repeat above (1) to (3) again.
2. Using 2.5 mm wide blade screw driver, adjust L
mixture needle to obtain maximum idle speed.
3. Set idle speed to 4,400 r/min by turning idle ad-
just screw.
4. Turn L mixture needle anticlockwise to reduce
engine idle speed 1,000 to 1,100 r/min to set idle
speed in the range of 3,300 to 3,400 r/min.
NOTE : Engine speed must be allowed to stabilize
a minimum of 20 seconds after each adjustment
of L mixture needle to assure accurate tachometer
readings.
5. Turn H mixture needle anticlockwise until en-
gine speed drops to approx. 11,000 r/min. Turn H
mixture needle 1/8 turn increments clockwise at
idle engine speed, then squeeze throttle trigger
and check WOT engine speed. If the WOT engine
speed is less than 11,500 r/min, turn H mixture
needle 1/8 turn clockwise again, and check WOT
engine speed. The final WOT engine speed should
fall within the11,700 to 12,300 r/min range.
NOTE : During H mixture needle adjustment, do
not run engine at high speed without load longer
than 10 seconds.
6. After adjusting carburettor, put new limiter cap
on the other side of limiter cap tool as shown, and
press the limiter caps to the bottoms on L and H
mixture needles respectively.
NOTE : Align the limiter cap’s tabs (A) with locat-
ing slots (B) in extended housing of carburettor.
IMPORTANT : The limiter caps must be in-
stalled L and H mixture needles to comply with
Emission Directive.
7. Start engine again and make it sure engine
runs at idle speed in the range of 2,800 to 3,600
r/min and at WOT engine speed in the range of
11,500 to 12,500 r/min. Also make it sure chain
would not turn at engine idle speed and suitable
acceleration.
NOTE : Initial carburettor setting (Idle adjust screw,
L and H mixture needles) shown here is to start the
engine after restoration or carburettor change. Idle
adjust screw, L and H needles turn for designated
engine revolution through procedures indicated
here may vary. As long as idle and WOT engine
speed is set in given range, variance would be ig-
norable.
H
L
(A)
(B)
(B)
(A)
L
H
idle adjust screw