Echo SRM-2655SI Instruction manual

SRM-2655SI10-25G-01 1

INTRODUCTION

We are constantly working on technical

improvement of our products. For this reason,

technical data, equipment and design are

subject to change without notice. All

specifications, illustrations and directions in

this SERVICE DATA are based on the latest

products information available at the time of

publication.

ECHO SERVICE MANUAL Ord. 402-24

(Model : SRM-2655) contains lots of

information for servicing this model.

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 EMISSION ADJUSTMENT GUIDE ............... 7

2-1 General adjusting rules ..............................7

2-2 Presetting idle adjust screw and idle mixture

needle ........................................................7

2-3 Adjusting carburettor ..................................8

Reference No. 10-25G-01

R E V I S E D : 2 0 0 5 0 2

INDEX ISSUED: 200410

SERVICE INFORMATION SRM-2655SI

1 SERVICE INFORMATION

1-1 Specifications

Model

SRM-2655SI(L) SRM-2655SI(U)

Dimensions Length* mm(in) 1785 (70.3) 1790 (70.5)

Width mm(in) 360 (14.2) 690 (27.2)

Height mm(in) 350 (13.8) 460 (18.1)

Dry weight** kg(lb) 5.9 (13.0) 6.5 (14.3)

Engine Type KIORITZ, air-cooled, two-stroke, single cylinder

Rotation Anticlockwise as viewed from the output end

Displacement cm3(in3) 25.4 (1.550)

Bore mm(in) 34.0 (1.339)

Stroke mm(in) 28.0 (1.102)

Compression ratio 6.3

Carburettor Type Rotary valve type: Diaphragm, horizontal-draught, with primer (purge bulb)

Model Walbro WYJ-192A

Venturi size-Throttle bore mm(in) 10.5 - 10.5 (0.41 - 0.41)

Ignition Type TCI (Transistor controlled ignition) system

in a single integrated piece

Spark plug BPMR7A

Starter Type - start

Rope diameter x length mm(in) 3.0 x 920 (0.12 x 36.22)

Fuel Type Premixed two-stroke fuel

Mixture ratio 50 : 1 (2 %)

Petrol Minimum 89 octane petrol (RON)

Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO FC

Tank capacity L (U.S.fl.oz.) 0.64 (21.6)

Clutch Type Centrifugal, 2 - shoe pivot

Handle Type Front Crescent loop U-shaped U-shaped

w/cushion grip

Rear Integrated control - - - - - -

grip w/cushion

Drive shaft Type Solid

Diameter - Length mm(in) 7 - 1540 (0.28 - 60.6)

Housing OD -ID mm(in) 25 - 22 (0.98 -0.87)

(Main pipe) Length mm(in) 1500 (59.1)

Gear case Reduction ratio 1.36

Gear tooth Spiral bevel gear

Lubrication Lithium based grease

Cutter Type Nylon line cutter, 3-tooth blade†, Others

Pilot diameter mm(in) 25.4 (1.0)

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 cutter head. ** With standard cutter head, without shoulder harness.

† Install and use U-shaped handle when operating with steel blade.

SERVICE INFORMATIONSRM-2655SI 3

1-2 Technical data

Engine

Idling speed r/min 2400 - 3000

Operating speed r/min 7000

Wide open throttle speed* r/min 8500 - 10000

Clutch engagement speed r/min 3100 - 3700

Compression pressure MPa (kgf/cm2) (psi) 0.98 (9.8) (138)

Ignition system

Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)

Minimum secondary voltage at 1000 r/min kV 17

Secondary coil resistance kΩ12 - 13

Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)

Ignition timing at 1000 r/min °BTDC 25

Carburettor

Main jet #37

Idle adjust screw initial setting turn in** 2 1/2

Idle mixture needle initial setting turn in*** 13 1/2

Test pressure, minimum MPa (kgf/cm2) (psi) 0.05 (0.5) (7.0)

Metering lever height mm(in) 1.5 (0.059) lower than diaphragm seat

BTDC: Before top dead centre.

* With two line nylon line head.

** Set idle adjust screw to contact throttle plate before initial setting.

*** Screw in idle mixture needle from initial thread engagement (at the point that the clicking sound is heard).

SERVICE INFORMATION SRM-2655SI

1-3 Torque limits

Descriptions Size kgf•cm N•m in•lbf

Starter Pawl carrier M 8 90 - 120 9 - 12 80 - 100

system Starter case M 4* 14 - 28 1.4 - 2.8 12 - 24

Ignition Magneto rotor (Flywheel) M 8 160 - 200 16 - 20 140 - 175

system Ignition coil M 5 40 - 60 4 - 6 35 - 52

Fan cover M 5 30 - 45 3.0 - 4.5 25 - 40

Spark plug M 14 150 - 170 15 - 17 130 - 150

Fuel Carburettor insulator M 5 50 - 70 5 - 7 45 - 60

system Carburettor M 5 30 - 45 3.0 - 4.5 25 - 40

Fuel tank M 5 30 - 45 3.0 - 4.5 25 - 40

Stand Starter side M 5 20 - 30 2 - 3 17 - 26

Fan cover side M 5 30 - 45 3.0 - 4.5 25 - 40

Clutch Clutch shoe M 6 70 - 110 7 - 11 60 - 95

Engine Crankcase M 5 70 - 110 7 - 11 60 - 95

Cylinder M 5 70 - 110 7 - 11 60 - 95

Top guard M 5* 30 - 45 3.0 - 4.5 25 - 40

Muffler M 5 60 - 100 6 - 10 52 - 85

Muffler cover M 5* 14 - 28 1.4 - 2.8 12 - 24

Others Blade fastening nut LM 10 280 - 320 28 - 32 245 - 280

Regular bolt, nut, M 3 6 - 10 0.6 - 1.0 5 - 9

and screw 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

M 10 210 - 300 21 - 30 180 - 260

LM: Left hand thread.

* Apply thread locking sealant. (See below)

1-4 Special repairing materials

Material Location Remarks

Thread locking sealant Muffler cover Loctite #242, ThreeBond 1324 or equivalent

Starter case Loctite #222, ThreeBond 1342 or equivalent

Top guard

Grease Gear case

Rewind spring Lithium based grease

Starter drum center hole

SERVICE INFORMATIONSRM-2655SI 5

5K223 5K224

5K225 5K016 5K042

5K182 5K222

5K188

12345678910 11

5K1895K219 5K220

1-5 Service limits

ABCD

EFGH

KLM

Description mm (in)

A Cylinder bore When plating is worn and aluminium can be seen

B Piston outer diameter Min. 33.91 (1.335)

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. 9.980 (0.3929)

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. 0.05 (0.002)

M Clutch drum bore Max. 55.5 (2.19)

SERVICE INFORMATION SRM-2655SI

1.5

1.65

1.3

0.4

120

140

160

180

100

ECHO

Key Part Number Description Used for:

1 897801-33330 Tachometer PET-1000 Measuring engine speed

2 895612-79920 L-hex wrench (3 mm) Removing and installing hex. socket bolts (M4)

3 895610-79920 L-hex wrench (4 mm) Removing and installing hex. socket bolts (M5)

4 897501-03938 Puller Removing flywheel

5 897537-12930 Piston stopper Locking crankshaft rotation

6 897563-19830 Metering lever gauge Measuring metering lever height on carburettor

7 897603-23030 PTO shaft puller Removing driven (PTO) shaft

8 897701-06030 Bearing wedge Removing ball bearings on crankshaft

9 897701-14732 Bearing tool Removing and installing crankcase ball bearings

10 897702-30131 Piston pin tool Removing and installing piston pin (Use 8 mm dia. adapter.)

11 897712-04630 2-pin wrench Removing and installing pawl carrier

12 897714-24330 Oil seal tool Installing crankcase oil seals

13 897726-09130 Oil seal tool Removing clutch drum and installing clutch drum ball bearing

14 897719-02830 Piston holder Making piston steady to remove and install piston and rings

15 897800-79931 Spark tester Checking ignition system

16 897803-30132 Pressure tester Checking carburettor and crankcase leakages

17 897826-16131 Pressure rubber plug Plugging intake port to test crankcase and cylinder leakages

18 897827-16131 Pressure plate Plugging intake port to test crankcase and cylinder leakages

19 897835-16131 Pressure connector Checking crankcase and cylinder leakages

20 900600-00012 Washer Installing drive gear

21 91007 Compression gauge Measuring cylinder compression

22 91020 2 way limiter cap tool Removing and installing plug

1-6 Special tools

a = 3mm

a = 4mm

13 14

20 22

SERVICE INFORMATIONSRM-2655SI 7

2 EMISSION ADJUSTMENT GUIDE

2-1 General adjusting rules

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” 2 stroke oil.

6. Two line nylon line head with properly cut lines must be installed for proper engine loading.

2-2 Presetting idle adjust screw and idle mixture needle

1. Remove the plug from idle mixture needle hole

(A) using 2 way limiter cap tool(B) (91020) as shown.

NOTE : When plug is damaged and left in the hole,

use needle or pin-shaped object to scrape.

2. Turn idle adjust screw (C) anticlockwise until its

tip just touches throttle plate (D). Then turn it in

clockwise 2 1/2 turns.

3. Turn idle mixture needle (E) anticlockwise to fully

come out until clicking sound is heard. Then turn it

clockwise 13 1/2 turns.

(C)

(D) (E)

(A)

(B)

SERVICE INFORMATION SRM-2655SI

2-3 Adjusting carburettor

1. Start engine and warm it up well for about 3 - 5 minutes with cycle of 50 seconds WOT (Wide Open

Throttle) and 10 seconds at idling.

2. Adjust idle mixture needle and obtain maximum idle speed with 2.5 mm blade screw driver.

3. Set idle speed 3,500 r/min by turning idle adjust screw.

4. Turn idle mixture needle anticlockwise to reduce idle speed 800 r/min to set idle speed 2,700 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. Check WOT engine speed. WOT engine speed should be more than 8,500 r/min.

6. After adjusting carburettor, insert and secure plug

(A) deep in the needle hole per the directive. 2 way

limiter cap tool (B) is useful to insert the plug.

7. Start engine again and make it sure engine runs

in the range of 2,400 to 3,000 r/min at idling and the

range of 8,500 to 10,000 r/min at WOT.Also make it

sure cutting device would not turn at engine idle

speed and suitable acceleration.

(A)

(B)

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