Echo GT-225 Instrucciones de montaje

GT-225, SRM-225

10-21S-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 and directions in this SERVICE

DATA are based on the latest products infor-

mation available at the time of publication.

ECHO SERVICE MANUAL Ord. 402-35

(Model : GT-225, SRM-225) contains lots

of information for servicing this model.

NOTE : Corrected tightening torque of

mufer cover on page 4.

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CONTENTS

page

1 SERVICE INFORMATION.............................. 2

1-1 Specication ................................................... 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 CARBURETOR ADJUSTMENT PROCEDURE......7

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

2-2 Presetting Idle adjust screw, Idle mixture

needle and Hi speed mixture needle..................... 7

2-3 Adjusting carburetor.................................... 8

Reference No. 10-21S-01

REVISED: 201304

ISSUED: 200810

SERVICE INFORMATION

GT-225

SRM-225

1 SERVICE INFORMATION

1-1 Specications

Model GT-225 SRM-225

Dimensions* Length mm (in) 1371 (54.0) 1793 (70.6)

Width mm (in) 315 (12.4) 251 (9.9)

Height mm (in) 539 (21.2) 328 (12.9)

Dry weight* kg (lb) 4.6 (10.1) 5.5 (12.1)

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

Rotation Counterclockwise as viewed from the output end

Displacement cm3 (in3) 21.2 (1.29)

Bore mm (in) 32.2 (1.27)

Stroke mm (in) 26.0 (1.02)

Compression ratio 5.9

Carburetor Type Rotary type : Diaphragm, horizontal-draft, with purge bulb

Model ZAMA RB-K93

Ignition Type CDI (Capacitor discharge ignition) system

Variable Slope Timing (VST) : Slope advance ignition

system combined with electronic speed governor

Spark plug BPM8Y (CANADA : BPMR8Y)

Exhaust Mufer type Spark arrester mufer with catalyst

Starter Type i-30

Rope diameter x length mm (in) 3.0 x 830 (0.12 x 32.7)

Fuel** Type Premixed two-stroke fuel

Mixture ratio 50 : 1 (2%)

Gasoline Minimum 89 octane

Two-stroke engine oil ISO-L-EGD (ISO/CD13738), JASO M345-FC/FD

Tank capacity L (U.S..oz.) 0.44 (14.9)

Clutch Type Centrifugal, 2-shoe pivot

Handle Type Front Loop handle

Rear Integrated control grip Integrated control grip

with throttle lock lever

Drive shaft Type Flexible

Diameter - Length mm 6.0 - 1219 6.15 - 1522

(in) (0.24 - 48.0) (0.24 - 59.9)

Housing OD - ID mm 22.25 - 19.05 25.0 - 22.0

(in) (0.88 - 0.75) (0.98 - 0.87)

Main pipe Length mm (in) 1130 (44.5) 1500 (59.1)

Gear case Reduction ratio --- 1.4

Gear tooth --- Spiral bevel gear

Lubrication Lithium based grease or ECHO LUBETM

Cutter Type Nylon line cutter, 8-tooth blade†, 22-tooth blade†, Others

Pilot diameter for blade mm(in) Not available Option : 20.0 (0.79)

Fastener type, size mm Not available Left-hand thread nut, M10 x 1.25 pitch

Cutting rotation Clockwise as viewed from top Counterclockwise as viewed from top

OD: Outer diameter. ID: Inner diameter. * Without shoulder harness and Nylon line head.

** Refer to Operator’s manual.

† Install blade conversion kit including metal shield when operating with metal blade.

SERVICE INFORMATION

GT-225

SRM-225 3

1-2 Technical data

Model GT-225 SRM-225

Engine

Idling speed rpm 2,900 +/- 400

Wide open throttle speed rpm* 6,900 - 8,100 7,600 - 8,700

Clutch engagement speed rpm 3,850 - 4,100

Compression pressure MPa (kgf/cm2) (psi) 0.66 (6.7) (96)

Ignition system

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

Minimum secondary voltage at 1500 rpm kV 15

Primary coil resistance 320 - 420

Secondary coil resistance k 2.7 - 3.3

Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016)

Ignition timing at 1,000 rpm °BTDC 17

at 3,000 rpm °BTDC 27

at 8,000 rpm °BTDC 42

PET-9000 Parameter #1 29 8

#2 03

Carburetor

Venturi Size mm(in) 9.0 (0.354)

Throttle Bore mm(in) 10.5 (0.413)

Idle adjust screw initial setting turn in** 2 1/2 2 3/8

Idle mixture needle initial setting turn back*** 2 7/8 2 5/8

Hi speed mixture needle initial setting turn back*** 3/4

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 center.

*With Nylon line cutter and shield.

** Set idle speed screw to the point that its tip just contacts throttle plate before initial setting.

***Turn Idle/Hi speed mixture needles counterclockwise from point that needle is lightly seated.

SERVICE INFORMATION

GT-225

SRM-225

1-3 Torque limits

Descriptions Size kgfcm Nm inlbf

Starter Starter pawl assembly M 8 80 - 100 8 - 10 70 - 90

system Starter case M 4* 30 - 45 3 - 4.5 25 - 40

Ignition Flywheel M 8 160 - 200 16 - 20 140 - 175

system Ignition coil M 4 35 - 50 3.5 - 5 30 - 44

Fan cover M 4 30 - 45 3 - 4.5 25 - 40

Spark plug M 14 130 - 170 13 - 17 112 - 150

Fuel Carburetor M 5 30 - 45 3 - 4.5 25 - 40

system Intake insulator M 5* 35 - 45 3.5 - 4.5 30 - 40

Fuel tank with stand M 5* 40 - 60 4 - 6 35 - 55

Cylinder cover Fan cover side M 5 25 - 45 2.5 - 4.5 22 - 40

Starter side†M 5 30 - 40 3 - 4 25 - 35

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

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

Mufer M 5* 90 - 110 9 - 11 80 - 95

Exhaust guide M 4 15 - 30 1.5 - 3 13 - 25

Mufer cover Fan cover side M 5* 25 - 45 2.5 - 4.5 22 - 40

Starter side†M 5 30 - 40 3 - 4 25 - 35

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

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

LM: Left-hand thread. † Tapping screw

* 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 Lithium based grease or ECHO LUBETM

Starter center post

Oil seal inner lips

Thread locking Starter case

sealant Mufer

Mufer cover Loctite #242, ThreeBond #1324 or equivalent

Fuel tank

Intake insulator Loctite #675

SERVICE INFORMATION

GT-225

SRM-225 5

1-5 Service limits

ABCD

EF GH

KLM

Description mm (in)

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

BPiston outer diameter Min. 32. 10 (1.264)

CPiston pin bore Max. 8. 030 (0.3161)

DPiston ring groove Max. 1. 6 (0.063)

EPiston ring side clearance Max. 0. 1 (0.004)

FPiston pin outer diameter Min. 7. 97 (0.3138)

GPiston ring width Min. 1. 45 (0.057)

HPiston ring end gap Max. 0. 5 (0.02)

KCon-rod small end bore Max. 12. 000 (0.4724)

LCrankshaft runout Max. 0. 03 (0.001)

MClutch drum bore Max. 51. 5 (2.03)

SERVICE INFORMATION

GT-225

SRM-225

Key Part Number Description Used for:

1 990511-30017 Tachometer PET-1000 Measuring engine speed

2 363018-00310 Washer Installing crankcase oil seal

3 X605-000050 Torx L wrench Removing and installing bolt

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 91009 Retaining ring pliers Removing and installing retaining ring

15 900100-08008 Bolt Removing magneto rotor (ywheel)

16 433019-12330 Flange nut Removing magneto rotor (ywheel)

17 91037 Compression gauge Measuring cylinder compression

18 900300 Ignition Analyzer : PET-9000 Measuring Ignition timing, Primary/Secondary voltage

1-6 Special tools

912

1817

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