Echo GT-220ES Mounting instructions

GT-220ES, SRM-220ES
10-21P-02 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.
1
SERVICE DATA
TRIMMER/BRUSHCUTTER
GT-220ES
SRM-220ES
(Serial nember : 36000001 and after)
STAGE MODEL
(Serial nember : 37000001 and after)
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 ...
7
2-1 General adjusting rules............................... 7
2-2 Initial Idle adjust screw, Idle mixture needle
and Hi speed mixture needle settings ................... 7
2-3 Adjusting carburettor................................... 8
Reference No. 10-21P-02
REVISED: 200901
ISSUED: 200705
INDEX

SERVICE INFORMATION
GT-220ES
SRM-220ES
2
1 SERVICE INFORMATION
1-1 Specifications
Model GT-220ES
SRM-220ES (L) SRM-220ES (U)
Dimensions Length* mm(in) 1460 (57.4) 1760 (69.3)
Width mm(in) 320 (12.6) 345 (13.5) 655 (25.7)
Height mm(in) 575 (22.6) 320 (12.6) 420 (16.5)
Dry weight* kg(lb) 4.4 (9.7) 5.0 (11.1) 5.1 (11.2)
Engine Type KIORITZ, air-cooled, two-stroke, single cylinder
Rotation Anticlockwise as viewed from the output end
Displacement cm3(in3) 21.2 (1.294)
Bore mm(in) 32.2 (1.268)
Stroke mm(in) 26.0 (1.024)
Compression ratio 5.9
Carburettor Type Rotary valve type: Diaphragm, horizontal-draught, with primer
Model ZAMA RB-K93
Venturi size-Throttle bore mm(in) 9.0 - 10.5 (0.35 - 0.41)
Ignition Type CDI (Capacitor discharge ignition) system
Variable Slope Timing (VST) : Slope advance ignition
system combined with electronic speed governor
Spark plug BPMR8Y
Exhaust Muffler type 36 series : Spark arrestor muffler
37 series : Spark arrestor muffler with catalyst
Starter Type ES (effortless-start)
Rope diameter x length mm(in) 3.0 x 820 (0.12 x 32.2)
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/FD
Tank capacity L (U.S.fl.oz.) 0.4 (13.5)
Clutch Type Centrifugal, 2 - shoe slide
Handle Type Front D-loop U-handle with
Rear
Integrated control grip with cushion integrated control grip
Drive shaft Type Flexible
Diameter - Length mm(in) 6.0 - 1330 (0.24 - 52.4) 6.0 - 1520 (0.24 - 59.8)
Housing OD -ID mm(in) 25 - 22 (0.98 - 0.87)
(Main pipe) Length mm(in)
1330 (52.4) 1500 (59.1)
Gear case Reduction ratio --- 1.36
Gear tooth --- Spiral bevel gear
Lubrication Lithium based grease
Cutter Type Nylon line head Metal blade
Fastener type, size mm Standard thread Left-hand thread nut, M10 x 1.25 pitch
3/8 inch - 24UNF
Cutting rotation Clockwise as viewed Anticlockwise as viewed from top
from top
OD: Outer diameter. ID: Inner diameter.
* Without shoulder harness and cutter head.

SERVICE INFORMATION
GT-220ES
SRM-220ES 3
1-2 Technical data
Model GT-220ES SRM-220ES (L) SRM-220ES (U)
Engine
Idling speed r/min 2600 - 3400
Wide open throttle speed r/min 7000 - 8000* 8000 - 9700* 9500 - 11500**
Clutch engagement speed r/min 3500 - 4100
Compression pressure MPa (kgf/cm2) (psi) 0.74 (7.6) (108)
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 Ω130 - 200
Secondary coil resistance kΩ1.0 - 2.0
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 3000 r/min °BTDC 27
at 8000 r/min °BTDC 42
Carburettor
Venturi Size mm(in) 9.0 (0.354)
Throttle Bore mm(in) 10.5 (0.413)
Idle adjust screw initial setting turn in*** 1 1/2 2 1/2
Idle mixture needle initial setting turn back† 2 3/4
Hi speed mixture needle initial setting turns back† 1 3/8
Test pressure, minimum MPa (kgf/cm2) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 0.1-0.25 (0.004-0.010) lower than diaphragm seat
BTDC: Before top dead centre.
* With two line nylon line head.
** With metal blade.
*** Set idle speed screw to the point that its tip just contacts throttle plate before initial setting.
† Turn Idle/Hi speed mixture needles anticlockwise from point that needle is lightly seated.

SERVICE INFORMATION
GT-220ES
SRM-220ES
4
1-3 Torque limits
Descriptions Size kgf•cm N•m in•lbf
Starter Starter case M 4 14 - 28 1.4 - 2.8 12 - 24
system
Ignition Ignition coil M 4 30 - 50 3 - 5 26 - 45
system Fan cover M 4** 14 - 28 1.4 - 2.8 12 - 24
Spark plug M 14 150 - 170 15 - 17 130 - 150
Ground lead terminal M 4** 20 - 40 2 - 4 18 - 35
Fuel Intake insulator M 5** 25 - 40 2.5 - 4 22 - 35
system Carburettor M 5 30 - 40 3 - 4 26 - 35
Throttle cable nut M 6 25 - 35 2.5 - 3.5 22 - 30
Fuel tank M 5** 30 - 45 3.0 - 4.5 26 - 40
Clutch Clutch hub M 8 120 - 160 12 - 16 100 - 140
Engine Crankcase M 5†70 - 100 7 - 10 60 - 90
Cylinder M 5†70 - 100 7 - 10 60 - 90
Cylinder cover M 4 14 - 28 1.4 - 2.8 12 - 24
Muffler M 5 60 - 100 6 - 10 52 - 85
Top guard M 5* 15 - 25 1.5 - 2.5 13 - 22
Others Trigger holder assembly M 5 35 - 55 3.3 - 5.5 30 - 48
Trigger holder assembly band M 5 20 - 40 2 - 4 18 - 35
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
M 10 210 - 300 21 - 30 180 - 260
*Tapping screw ** Apply thread locking sealant. (See below)
† The torque differences among bolts should not exceed 20 kgf•cm (2N•m, 17in•lbf) on one cylinder or
crankcase.
1-4 Special repairing materials
Material Location Remarks
Thread locking sealant Fan cover
Intake insulator
Ground lead terminal
ThreeBond 1342 or equivalent
Fuel tank
Grease Gear case
Rewind spring Lithium based grease
Starter center post

SERVICE INFORMATION
GT-220ES
SRM-220ES 5
Description mm (in)
A Cylinder bore When plating is worn and aluminium can be seen
B Piston outer diameter Min. 32.10 (1.264)
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. 7.970 (0.3138)
G Piston ring width Min. 1.45 (0.057)
H Piston ring end gap Max. 0.5 (0.02)
K Crankshaft runout Max. 0.03 (0.001)
L Clutch drum bore Max. 51.5 (2.03)
5K016 5K042
5K171
5K228A 5K229A 5K230
5K231A
0
5
10
12345678910 11
5K071A
5K268
5K269
1-5 Service limits
ABCD
EFGH
KL

SERVICE INFORMATION
GT-220ES
SRM-220ES
6
Ignition Air Gap Gauge
#.014 = .35mm
P/N 91004
ECHO
0
0.4
50
0.8
1.2
1.
MPa
0
Key Part Number Description Used for:
1 897801-33330 Tachometer PET-1000 Measuring engine speed
2 363018-00310 Washer Installing crankcase oil seal of starter side
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 897705-11520 Bearing tool Removing and installing con-rod small end needle bearing
9 897712-04630 2-pin wrench Removing and installing pawl carrier
10 897726-09130 Oil seal tool Installing crankcase oil seals
11 897800-79931 Spark tester Checking ignition system
12 897803-30131 Pressure tester Checking carburettor and crankcase leakages
13 897835-16131 Pressure connector Checking crankcase and cylinder leakages
14 433019-12330 Flange nut Removing magneto rotor (flywheel)
15 900100-08008 Bolt Removing magneto rotor (flywheel)
16 91020 Limiter plug tool Removing and installing plug
17 91037 Compression gauge Measuring cylinder compression
18 91004 Module air gap gauge Adjusting pole shoe air gaps
1-6 Special tools
1
6
14
7
17
3
8
10
5
912
13
11
24
15 18
16

SERVICE INFORMATION
GT-220ES
SRM-220ES 7
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”
2-stroke oil.
6. Two nylon line head with properly cut lines is recommended to be installed for proper engine loading.
B. Start and run engine for 3 minutes alternating engine speed between WOT for 10 seconds and idle for
5 seconds. Adjust idle speed screw to 3,000 +/- 100 r/min. If engine does not run correctly after this adjust-
ment, 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 mixture needle(s) hole(s) to comply with Emission Directive.
2-2 Initial Idle adjust screw, Idle mixture needle and Hi speed mixture needle settings
Parts Required : (2) limiter plug P/N P005-001270
1. Remove 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) Turn limiter plug tool anticlockwise 2 turns slow-
ly into limiter plug while pushing the tool.
3) Pull out limiter plug tool with the limiter plug from
mixture needle hole.
NOTE : If plug is damaged and stays in the hole,
use hand auger or pin-shaped tool to scrape and
lift the plug pieces out of the hole.
2.
Turn Idle mixture needle (D) clockwise completely until lightly seated. Then turn it anticlockwise 2 3/4
turns. Turn Hi speed mixture needle (G) clockwise until lightly seated. Then turn it anticlockwise 1 3/8 turn.
3. Turn Idle adjust screw (E) anticlockwise until screw tip just touches throttle plate (F). Then turn it in
clockwise 1 1/2 (GT-220ES), 2 1/2 (SRM-220ES) 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 nee-
dles turn for designated engine revolution through procedures indicated here may vary. As long as idle
and WOT engine speed is set in given range, the variance would be ignorable.
(A)
(B)
(G)
(A)
(E)
(F)
(D)
(C)
1) 2) 3)
(E)

SERVICE INFORMATION
GT-220ES
SRM-220ES
8
2-3 Adjusting carburettor
1. Start and warm up engine alternating engine
speed between WOT for 10 seconds and idle for 5
seconds for 3 minute.
NOTE : If the engine can’t start, turn Idle mixture
needle clockwise in 1/4 turn increments until the
engine starts.
2. Adjust Idle mixture needle to reach maximum
idle speed with 2.5 mm blade screwdriver.
3. Set idle speed to 3,800 r/min by turning Idle ad-
just screw. Engine speed should be stable at 3,800
+/- 50 r/min.
4. Turn Idle mixture needle anticlockwise to re-
duce engine idle speed 800 r/min to set idle speed
at 3,000 r/min. The idle speed range is 2,900 - 3,100
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 to reach maxi-
mum WOT engine speed.(maximum approximate
7,300 r/min on GT-220ES, 8,800 r/min on SRM-
220ES with nylon line head, 10,500 r/min on SRM-
220ES with metal blade.) Then turn Hi speed
mixture needle anticlockwise to reduce WOT en-
gine speed 20 r/min.
6. Start engine again and verify engine idle speed
ranges from 2,600 to 3,400 r/min, and WOT en-
gine speed ranges from 7,000 r/min to 8000 r/min
on GT-220ES, 8,000 r/min to 9,700 r/min on SRM-
220ES with nylon line head, 9,500 r/min to 11,500
r/min on SRM-220ES with metal blade. Make sure
the cutter does not rotate when engine is idling.
When final adjustment is completed, the engine
should idle, accelerate smoothly, and attain WOT
per above specifications.
7. After adjusting carburettor, completely insert and
secure new plug (s) (J) P005-001270 deep in the
needle holes per the Emission directive using lim-
iter plug tool (H).
NOTE : Engine WOT, and idle engine speed in
field operation may vary from final adjustment
specifications due to changing ambient conditions,
fuel, and engine loads. Safe engine speed vari-
ances should be within the WOT and Idle speed
ranges listed in Section 1-1, otherwise the carbure-
tor should be readjusted.
(J)
(H)
(J)