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SRM-265ES10-25L-01
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1
2
INTRODUCTION
We are constantly working on technical
improvement of our products. For this reason,
technical data, equipment and design are
subject to c hange without noti ce. All
specifications and directions in this SERVICE
DATA are based on the latest products
informat ion available a t th e time of
publication.
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 ......................... 4
1-5 Service limits .............................................. 5
1-6 Special tools ............................................... 6
2 CARBURETTOR ADJUSTMENT PROCEDURE .
2-1 General adjusting rules .............................. 7
2-2 Presetting Idle adjust screw, idle mixture
needle and hi speed (H) mixture needle .............. 7
2-3 Adjusting carburettor .................................. 8
3 SERVICE HINT .............................................. 9
3-1
Reassebling 2 Nord-lock washers on Muffler ...
3-2 Adjusting throttle cable ................................ 10
3-3 Replacing crankshaft ................................... 11
Reference No. 10-25L-01
R E V I SED : 20100 1
ISSUED: 200708
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9
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1 SERVICE INFORMATION
1-1 Specifications
Model SRM-265ES (L) SRM-265ES (U)
Dimensions* Length mm (in) 1780 (70.1) 1785 (70.2)
Width mm (in) 345 (13.6) 665 (26.1)
Height mm (in) 313 (12.3) 440 (17.3)
Dry weight* kg (lb) 6.1 (13.4) 6.2 (13.7)
Engine Type KIORITZ, air-cooled, two-stroke, single cylinder
Rotation Anticlockwise as viewed from the output end
Displacement cm3 (in3) 25.4 (1.55)
Bore mm (in) 34.0 (1.34)
Stroke mm (in) 28.0 (1.10)
Compression ratio 7.3
Carburetor Type Rotary type : Diaphragm, horizontal-draught, with primary
Model ZAMA RB-K89, RB-K94***
Ignition Type CDI (Capacitor discharge ignition) system
Spark plug BPMR8Y
Exhaust Muffler type Spark arrester muffler with catalyst
Starter Type ES (effortless-start)
Rope diameter x length mm (in) 2.8 x 850 (0.11 x 33.5)
Fuel** Type Premixed two-stroke fuel
Mixture ratio 50 : 1 (2%)
Petrol Minimum 89 octane
Two-stroke engine oil ISO-L-EGD (ISO/CD13738), JASO FC/FD
Tank capacity L (U.S.fl.oz.) 0.5 (16.9)
Clutch Type Centrifugal, 2-shoe pivot
Handle Type Front : Crescent loop with cushion grip U-handle with integrated
Drive shaft Type Solid, hollow type with 7-tooth
Diameter - Length mm 7.0 - 1540
Housing OD - ID mm 25.0 - 22.0
SERVICE INFORMATION
Digital magneto
Rear : Integrated control grip with cushion control grip
(in)
(in) (0.98 - 0.87)
(0.27 - 60.62)
SRM-265ES
Main pipe Length mm (in) 1500 (59.1)
Gear case Reduction ratio 1.4
Gear tooth Spiral bevel gear
Lubrication Lithium based grease or ECHO LUBE
Cutter Type Nylon line cutter 3-tooth blade (230 mm)
Pilot diameter for blade )0.1( 4.52 )ni(mm
Fastener type, size mm Left-hand thread nut, M10 x 1.25 pitch
Cutting rotation Anticlockwise as viewed from top
OD: Outer diameter. ID: Inner diameter. * Without shoulder harness and Nylon line head.
** Refer to Operator’s manual.
*** Refer to Technical Information No. 2009-395.
TM
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SRM-265ES
1-2 Technical data
Model SRM-265ES (L) SRM-265ES (U)
Engine
Idling speed r/min 2600 - 3200
Wide open throttle speed r/min 9400 - 10400* 10200 - 11200**
Clutch engagement speed r/min 3600 - 4200
Compression pressure MPa (kgf/cm2) (psi) 0.99 (10.1) (143)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1500 r/min kV 15
Primary coil resistance Ω 320 - 420
Secondary coil resistance kΩ 2.7 - 3.3
Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016)
Ignition timing at 2000 r/min °BTDC 7
at 3000 r/min °BTDC 5
at 8000 r/min °BTDC 28
at 11000 r/min °BTDC 22
Carburettor
Venturi Size mm(in) 10.5 (0.413)
Throttle Bore mm(in) 10.5 (0.413)
Idle adjust screw initial setting turn in*** 3 1/4
Idle mixture needle initial setting turn back 1 1/2
Hi speed H mixture needle initial setting
Test Pressure, minimum MPa (kgf/cm2) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 0.1-0.25 (0.004-0.01) lower than diaphragm seat
BTDC: Before top dead centre.
*With Nylon line cutter and shield.
**With 3-tooth blade (230 mm).
*** Set idle adjust screw to the point that its tip just contacts throttle plate before initial setting.
SERVICE INFORMATION
turn back 1 1/2
3
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4
1-3 Torque limits
Descriptions Size kgf• cm N•m in•lbf
Starter Starter pawl assembly M 8 160 - 200 16 - 20 140 - 175
system
Ignition Flywheel M 8 160 - 200 16 - 20 140 - 175
system
Fuel Carburettor M 5 30 - 45 3.0 - 4.5 25 - 40
system
Clutch Clutch shoe M 6 70 - 110 7 - 11 60 - 95
Cylinder cover Flanged bolt M 5* 30 - 45 3.0 - 4.5 25 - 40
Engine Crankcase M 5 70 - 110 7 - 11 60 - 95
Other Cutter fastener LM 10 280 - 320 28 - 32 245 - 280
Regular bolt, nut and screw M 3 6 -10 0.6 - 1 5 - 9
Starter case M 4* 25 - 35 2.5 - 3.5 22 - 33
Ignition coil M 4* 35 - 50 3.5 - 5 30 - 45
Fan cover M 5* 35 - 50 3.5 - 5 30 - 45
Spark plug M 14 130 - 170 13 - 17 112 - 150
Intake insulator M 5 60 - 80 6 - 8 55 - 70
Fuel tank with stand M 5* 40 - 60 4 - 6 32 - 55
Button bolt M 5* 20 - 30 2 - 3 17 - 25
Cylinder M 5 70 - 110 7 - 11 60 - 95
Muffler M 5 60 - 80 6 - 8 55 - 70
Exhaust guide M 4 14 - 28 1.4 - 2.8 12 - 24
Muffler cover M 5* 30 - 45 3.0 - 4.5 25 - 40
Top guard M 5* 20 - 40 2 - 4 20 - 32
SERVICE INFORMATION
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
M 8 110 -150 11 - 15 95 - 130
SRM-265ES
LM: Left-hand thread. * Apply thread locking sealant. (See below)
** The torque differences among four bolts should not exceed 20 kgf•cm (2N•m, 17in•lbf) on one cylinder or crankcase
1-4 Special repairing materials
Material Location Remarks
Grease Drive shaft
Gear case
Rewind spring
Starter center post
Oil seal inner lips
Thread locking Starter case
sealant Fuel tank
Ignition coil Loctite #242, ThreeBond #1324 or equivalent
Fan cover
Top guard
Stand Loctite #222, Three Bond #1342 or equivalent
Muffler cover
Cylinder cover
Lithium based grease or ECHO LUBE
Loctite #675 or equivalent
TM
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SRM-265ES
SERVICE INFORMATION
1-5 Service limits
ABCD
5
5K243
5K228 5K229 5K230
EFGH
5K231 5K016
5K042
5K244
KLM
0 1 2
3 456 7 8 9 10 11
0
5
10
12
5K219
5K171
5K232
Description mm (in)
A Cylinder bore When plating is worn and aluminium can be seen
B Piston outer diameter Min. 33.92 (1.335)
C Piston pin bore Max. 9.035 (0.3557)
D Piston ring groove Max. 1.65 (0.065)
E Piston ring side clearance Max. 0.1 (0.004)
F Piston pin outer diameter Min. 8.98 (0.3535)
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. 12.025 (0.4734)
L Crankshaft runout Max. 0.03 (0.001)
M Clutch drum bore Max. 59.5 (2.34)
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0
0.4
50
0.8
1.2
1.
MPa
0
1-6 Special tools
1
SERVICE INFORMATION
2
3
4
SRM-265ES
5
9
13
6
10
ECHO
14
7
11
16
8
12
#.014 = .35mm
Ignition Air Gap Gauge
P/N 91004
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Key Part Number Description Used for:
1 897801-33330 Tachometer PET-1000 Measuring engine speed
2 363018-00310 Washer Installing crankcase oil seal
3 895610-79920 L-hex wrench (4 mm) Removing and installing hex. socket bolts (M5)
4 897603-23030 PTO shaft puller Removing driven (PTO) shaft
5 897701-06030 Bearing wedge Removing ball bearings on crankshaft
6 897701-14732 Bearing tool Removing and installing crankcase ball bearings
7 897702-30131 Piston pin tool Removing and installing piston pin (Use 8 mm dia. adapter.)
8 91004 Module air gap gauge Adjusting pole shoe air gaps
9 897712-04630 2-pin wrench Removing and installing pawl carrier
10 91020 Limiter plug tool Removing and installing plug
11 897726-09130 Oil seal tool Installing crankcase oil seals
12 990511-30023 Spark tester Checking ignition system
13 897803-30133 Pressure tester Checking carburetor and crankcase leakages
14 900100-08008 Bolt
Removing magneto rotor (flywheel), crankshaft from crankcase
15 433019-12330 Flange nut Removing magneto rotor (flywheel)
16 91037 Compression gauge Measuring cylinder compression
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SRM-265ES
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/FD” 2stroke oil.
6. Remove shield from gear case, and install nylon line cutter if 3-tooth blade is installed. Extend nylon line
cutter and cut nylon line cutter lengths to 180 mm (7.0 inches) for proper engine loading to adjust carburettor
on both SRM-265ES(L) and SRM-265ES(U).
B. Start and run engine for 2 minutes alternating rpm between WOT and idle every 5 seconds. Adjust idle speed
to 2,900 +/- 200 r/min by turing idle adjust screw. If engine does not run correctly after this adjustment, proceed to
the next step 2-2.
IMPORTANT : After adjusting carburettor according to the steps 2-2 and 2-3, the limiter plug(s) must
be installed in idle and hi speed (H) mixture needle(s) hole(s) to comply with Emission Directive.
SERVICE INFORMATION
7
2-2 Presetting Idle mixture needle and hi speed (H) mixture needle
Parts Required : 2 limiter plugs P/N P005-001270
1. Remove the plugs from Idle mixture needle hole
(A) and hi speed mixture needle hole (B) using limiter
plug tool (C) as follows.
1) Put limiter plug tool (C) on limiter plug in mixture needle
hole.
2) Push and turn limiter plug tool anticlockwise 2 turns into
limiter plug slowly.
3) Pull out limiter plug tool with the limiter plug from mixture
needle hole.
1)
(C)
NOTE : If plug is damaged and stays in the hole,
use hand auger or pin-shaped tool to scrape, and
lift the cap pieces out of the hole.
(F)
(E)
(D)
(A)
(A)
(B)
(G)
2)
3)
2.
Turn Idle mixture needle (D) clockwise completely until lightly seated.
Turn hi speed mixture needle (G) clockwise until lightly seated. Then turn it anticlockwise 1 1/2 turns.
3. Turn idle adjust screw (E) anticlockwise until screw tip just touches throttle plate (F). Then turn it in
clockwise 3 1/4 turns.
NOTE : Initial carburettor setting (Idle adjust screw, idle and hi speed mixture needles) shown here is to
start the engine after restoration or carburettor change. Idle adjust screw, idle and hi speed mixture 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 ignorable.
Then turn it anticlockwise 1 1/2 turns.
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2-3 Adjusting carburettor
(D)
(E)
(E)
(G)
SERVICE INFORMATION
1. Start and warm up engine alternating engine
speed between WOT and idle every 5 seconds for
1 minute.
2. Adjust idle mixture needle (D) to reach maximum
idle speed with 2.5 mm blade screwdriver.
3. Set idle speed to 3,700 r/min by turning idle adjust
screw (E). Engine speed should be stable at 3,700
+/- 50 r/min.
4. Turn idle mixture needle anticlockwise to reduce
engine idle speed 800 r/min to set idle speed at
2,900 r/min. The idle speed range is 2,800 - 3,000
r/min.
NOTE : Engine speed must be allowed to stabilize
a minimum of 20 seconds after each adjustment of
idle mixture needle to assure accurate tachometer
readings.
5. Adjust hi speed mixture needle (G) to reach
maximum WOT engine speed. Then turn hi speed
mixture needle anticlockwise to reduce WOT engine
speed 10 r/min (max. approx. 8,500 r/min).
SRM-265ES
(J)
(J)
(C)
6. SRM-265ES(L) : Reinstall shield with cutting knife.
Cut nylon line cutter lengths to 152 mm to match
nylon line cutter reach to shield cut knife. Start
engine again and verify engine idle speed ranges
from 2,700 to 3,100 r/min, and WOT engine speed
ranges from 9,400 to 10,400 r/min.
SRM-265ES(U) : Reinstall shield for 3-tooth
blade(230 mm). Start engine and verify engine idle
speed ranges from 2,700 to 3,100 r/min, and WOT
engine speed ranges from 10,200 to 11,200 r/min.
Make sure the nylon line cutter/3-tooth blade(230
mm) does not rotate when engine is idle,and engine
should accelerate smoothly.
7. After adjusting carburettor, insert and secure new
plug(s) (J) P005-001270 deep in the needle holes
per the Emission Directive using limiter plug tool (H).
NOTE : Engine WOT, and idle speed in field
operation may vary from final adjustment
specifications due to changing ambient conditions,
fuel, and engine loads. Safe engine speed variances
should be within the WOT and Idle speed ranges
listed in Section 1-1, otherwise the carburettor
should be readjusted.
Page 9
SRM-265ES
3 SERVICE HINT
3-1 Reassembling 2 Nord-lock washers on Muffler
(B)
(A)
SERVICE INFORMATION
9
1. 2 Nord-lock washers (A) are installed to prevent
muffler nuts (B) from loosening. There is a chance
for the 2 Nord-lock washers (A) to drop separately
when loosening muffler nut (B).
2. If 2 Nord-lock washers (A) are separated,
reassemble 2 Nord-lock washers (A) as shown on
Fig.1
(A)
NOTE : 2 Nord-lock washers (A) are bonded for
spare parts(No. 92280-05000).
(Fig 1)
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3-2 Adjusting throttle cable
(A)
SERVICE INFORMATION
1. When squeezing throttle trigger (A), make sure
throttle plate (B) should be full open at WOT position.
Throttle plate tab (b) should contact with plastic boss
(E).
SRM-265ES
(C)
(A)
(B)
(D)
(E)
(B)
2. When squeezing throttle trigger (A) without
throttle trigger lockout (C), there is a chance for inner
cable (F) of throttle wire to move a little bit. However
throttle plate (B) should be no movement.
If throttle plate (B) can be moved, adjust nut (D)
using 8 mm spaner not to move throttle plate (B).
NOTE : If the throttle plate (B) moves when
squeezing throttle trigger (A) without throttle trigger
lockout (C), engine speed increases.
(F)
(B)(B)
Page 11
SRM-265ES
3-3 Replacing crankshaft
SERVICE INFORMATION
(A)
(B)
1. Loosen and remove 3 bolts (A).
2. Thread flange nut (C) (guide bar flange nut on
some ECHO chain saws) on crankshaft 3 turns on
flywheel side of crankcase.
3. Screw the bolt (B)(M8X8) in the flange nut (C)
until the bolt (B) bottoms.
4. Tap the bolt head (axially) to remove the
crankcase from flywheel side of crankcase.
5. Thread flange nut (C) on crankshaft 3 turns on
starter side of crankcase.
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(D)
Flywheel side of crankcase
(E)
Starter side of crankcase
(C)
6. Thread the bolt (B) in the flange nut (C) until the
bolt (B) bottoms.
7. Tap the bolt head (axially) to remove the
crankshaft from starter side of crankcase.
8. For easier reassembling crankshaft, heat ball
bearing inner collar by heat gun approx. 5 minutes.
9. Insert crankshaft quickly through ball bearing
before the heat on ball bearing is transmitted to
crankshaft.
Parts Number : Bolt (B) : 900100-08008
Flange nut (C) : 433019-12330
NOTE : The flywheel side oil-seal (D) is indicated
as “12 22 45” on the outside.
The starter side oil-seal (E) is indicated as “12 22
45 F” and has a white dot on the outside.crankcase.
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