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SRM-500010-52D-02
1
1
lNTRODUCTION
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. 402-25
(Model : SRM-4000, RM-4000) contains lots
of information for servicing this model.
NOTE : SRM-5000 serial number 36000001 to
36007482. Refer to Service Data 10-52C-01.
INDEX
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 Idle adjust screw, idle mixture needle and
H mixture needle initial settings..................7
2-3 Adjusting carburettor.................................. 8
Reference No. 10-52D-02
R E V I S E D : 2 00609
ISSUED: 200510
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2
1 SERVICE INFORMATION
1-1 Specifications
Model SRM-5000(L) SRM-5000(U)
Dimensions Length* mm(in) 1860 (73.2) 1860 (73.2)
Width mm(in) 325 (12.8) 700 (27.6)
Height mm(in) 265 (10.4) 430 (16.9)
Dry weight** kg(lb) 8.3 (18.30) 8.7 (19.18)
Engine Type
Rotation Anticlockwise as viewed from the output end
Displacement cm3(in3) 51.7 (3.155)
Bore mm(in) 44.0 (1.732)
Stroke mm(in) 34.0 (1.339)
Compression ratio 6.9 : 1
Carburettor Type Rotary type : Diaphragm, horizontal-draught, with primer
Model Walbro WYK-22 7
Venturi size-Throttle bore mm(in) 13.5 - 15.0 (0.531 - 0.591)
Metering diaphragm pressure Lead pressure from inside of cleaner case
Ignition Type
Spark plug RCJ-6Y
Starter Type Automatic rewind
Rope diameter x length mm(in) 3.8 x 1150 (0.15 x 45.3)
Fuel Type Premixed two-stroke fuel
Mixture ra ti o 50 : 1 (2 %)
Petrol Minimum 89 octane petro l (R O N )
Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO FC
Tank capacity L (U.S.fl.oz.) 1.0 (33.8)
Clutch Type Centrifugal, 2 - shoe pivot
Handle Type Front Crescent loop w/cushion grip U-shaped
Drive shaft Type Solid (Spline shaft)
Diameter - Length mm(in) 8 - 1590 (0.31 - 62.6)
Housing OD -ID mm(in) 28 - 24 (1.10 -0.94)
(Main pipe) Length mm(in) 1530 (60.2)
Gear case Reduction ratio 1.33
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.
††
Primer is on cleaner case.
SERVICE INFORMATION SRM-5000
KIORITZ, air-cooled, two-stroke, single cylinder
Semi-automatic decompression
CDI (Capacitor discharge ign iti on) sys tem in a single integrated
piece, with elec tronic timing advancer and speed governer
Rear Integrated control grip w/cushio n - - -
††
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SERVICE INFORMATIONSRM-5000
1-2 T echnical data
Engine
Idling speed r/min 2000 - 2700
Operating speed r/min 7500 - 8500
Wide open throttle speed r/min 9700 - 10300 †1 10500 - 12000
Clutch engagement speed r/min 3400 - 3900
Compression pressure MPa (kgf/cm2) (psi) 0.93 (9.5) (135)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1000 r/min kV 14.0
Secondary coil resistance k 2.0 - 2.8
Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016)
Ignition timing at 1000 r/min °BTDC 28
at 3000 r/min °BTDC 35
at 7000 r/min °BTDC 40
at 10000 r/min °BTDC 33
Carburettor
Idle adjust screw initial setting turn in* 3 3/4
Idle mixture needle initial setting turn in** 13 1/2
H mixture needle initial setting turn back 4
Test Pressure, minimum MPa (kgf/cm2) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 1.5 (0.06) lower than diaphragm seat
3
†2
BTDC: Before top dead center.
* Set idle speed screw to the point that its tip just contacts throttle plate before initial setting.
** Screw in idle mixture needle from initial thread engagement (at the point that the clicking sound is heard).
1
†
With two line nylon line head.
2
†
With metal blade.
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1-3 Torque limits
Descriptions Size kgf•cm N•m in•lbf
Starter Pawl carrier M 8 80 - 100 8 - 10 70 - 90
system
Ignition Magneto rotor (Flywheel) M 10 200 - 240 20 - 24 175 - 210
system
Fuel Carburettor insulator M 5 40 - 55 4 - 5.5 35 - 50
system
Clutch Clutch shoe M 8 160 - 200 16 - 20 140 - 175
Engine Crankcase M 5** 70 - 110 7 - 11 60 - 95
Others Blade fastening nut LM 10 280 - 320 28 - 32 245 - 280
Regular bolt, nut and screw M3 6 - 10 0.6 - 1 5 - 9
LM: Left hand thread. * Apply thread locking sealant. (See below)
** The torque diff erences among four bolts should not exceed 20 kgf•cm (2N•m, 17in•lbf) on one cylinder or
crankcase.
Pawl carrier nut M 8 160 - 200 16 - 20 140 - 175
Starter case M 5* 35 - 50 3.5 - 5 30 - 45
Ignition coil M 5 60 - 100 6 - 10 50 - 90
Spark plug M 14 150 - 170 15 - 17 130 - 150
Fan cover M 5 70 - 110 7 - 11 60 - 95
Carburettor M 5 30 - 45 3 - 4.5 26 - 40
Fuel tank bracket M 5 70 - 110 7 - 11 60 - 95
Fuel tank M 5* 50 - 90 5 - 9 45 - 80
Cylinder M 5** 70 - 110 7 - 11 60 - 95
Decompression valve M 8 80 - 100 8 - 10 70 - 90
Top guard M 5* 30 - 45 3 - 4.5 26 - 40
Muffler M 6 110 - 150 11 - 15 95 - 130
Muffler cover M 5* 30 - 45 3 - 4.5 26 - 40
Muffler stay M 5 70 - 110 7 - 11 60 - 95
M 4 15 - 25 1.5 - 2.5 13 - 22
SERVICE INFORMATION SRM-5000
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
1-4 Special repairing mater ials
Material Location Remarks
Grease Gear case
Rewind spring Lithium based grease or ECHO LUBE
Starter center post
Oil Oil seal inner lips
Drive shaft
Thread locking sealant Starter case
Muffler cover Loctite #242, ThreeBond #1324 or equivalent
Fuel tank
Top guard
Two-stroke engine oil or engine oil (SAE#30)
TM
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SERVICE INFORMATIONSRM-5000
1
2
3
4
5
6
7
1-5 Service limits
ABCD
5
5K245
5K222
5K223 5K224
EFGH
5K225 5K016 5K042
5K246
KLM
Description mm (in)
A Cylinder bore When plating is worn and aluminium can be seen
B Piston outer diameter Min. 43.88 (1.728)
C Piston pin bore Max. 10.115 (0.3982)
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. 9.95 (0.392)
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. 14.025 (0.552)
L Crankshaft runout Max. 0.05 (0.002)
M Clutch drum bore Max. 79.5 (3.13)
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20
40
60
80
120
140
160
180
20
100
1-6 Special tools
1
2: a = 4 mm
3: a = 5 mm
SERVICE INFORMATION SRM-5000
4
5
a
6
1.3
1.65
0.4
1.5
7
8:
a = 80 mm
10
11
9: a = 70 mm
a
12
13
14: a = 12 mm
b = 32 mm
a
16
17
18
15:a = 15 mm
b = 24.5mm
b
8
0
1
0
60
19
20
21 23
22
24
25
0
1
26
20
4
0
1
4
20
0
1
6
0
1
8
0
20
E
C
H
O
Key Part Number Description Used for:
1 897801-33330 Tachometer PET-1000 Measuring engine speed to adjust carburettor
2 895610-79920 L-hex wrench (4 mm) Removing and installing hex. socket bolt (M5)
3 895611-79920 L-hex wrench (5 mm) Removing and installing hex. socket bolt (M6)
4 897501-03938 Puller Removing flywheel
5 897537-30130 Piston stopper Locking crankshaft rotation
6 897563-19830 Metering lever gauge Measuring metering lever height on carburettor
7 897603-23030 PTO shaft puller Removing PTO shaft
8 897701-02830 Bearing wedge Removing ball bearing remaining on crankshaft
9 897701-06030 Bearing wedge Removing ball bearing on PTO shaft / drive gear
10 897701-14732 Bearing tool Removing and installing ball bearings on crankcase / clutch drum
11 897702-30131 Piston pin tool Removing and installing piston pin (Use 10mm dia. adapter)
12 897712-04630 2-pin wrench Removing and installing pawl carrier
13 897714-12330 Oil seal tool Installing crankcase oil seal (clutch side)
14 897714-24330 Oil seal tool Installing crankcase oil seal (starter side) / PTO shaft bearings
15 897726-21430 Oil seal tool Installing crankcase oil seal (clutch side)
16 897718-03930 Bearing tool Installing crankcase oil seal (starter side)
17 897719-02830 Piston holder Making piston steady to remove and install piston / ring
18 363018-00310 Washer Installing crankcase oil seal (starter side)
19 897800-79931 Spark tester Checking ignition system
20 897803-30132 Pressure tester Testing fuel pipes/tank and crankcase leakages
21 897826-16131 Pressure plug Plugging intake port to test crankcase / cylinder sealing
22 897827-16131 Pressure plate Plugging intake port to test crankcase / cylinder sealing
23 897831-16131 Pressure plug Plugging exhaust port to test crankcase / cylinder sealing
24 897835-16131 Pressure connector Testing crankcase and cylinder leakages
25 91007 Compression guage Measuring cylinder compression
26 91020 Limi ter plug tool Removing and installing limiter plug
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SERVICE INFORMATIONSRM-5000
2 EMISSION ADJUSTMENT GUIDE
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” 2 stroke oil.
6. Two line nylon line head with properly cut lines is recommended to be installed for proper engine loading.
B. Start and run engine for 1 minute at idle speed, and then for 2 minutes alternating engine speed between
WOT for 20 seconds and idle for 10 seconds. Adjust idle speed screw to 2,500 +/- 100 r/min. 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 Idl e and H mixture needle(s) ho le (s ) to c omp ly w it h Em ission Directive.
2-2 Idle adjust screw, idle mixture needle and H mixture ne edle initial settings
1. Remove the plugs from idle mixture needle hole
(A)
(A) and H mixture needle hole (B) using limiter plug
tool (C) as follows.
7
(D)
(F)
(C)
(B)
(E)
(1)Put limiter plug tool (C) on limiter plug in mixture
needle hole.
(2)Screw limiter plug tool counterclockwise 2 turns
into limiter plug while pushing the tool.
(3)Pull out limiter plug tool with the limiter plug from
mixture needle hole.
(4)Repeat plug removal procedure for the other
mixture needle.
(C)
NOTE : When plug is damaged and left in the hole,
use needle or pin-shaped tool to scrape.
2. Turn idle adjust scre w (D) a nticlo ckwi se u ntil its
tip just toes throttle plate (E). Then turn it in clockwise
3 3/4 turns.
3. Turn idle mixture needle (C) anticlockwise to fully
come out until clicking sound is heard. Then turn it
clockwise 13 1/2 turns.
Turn H mixture needle (F) clockwise until lightly
seated. Then turn it anticlockwise 4 turns.
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2-3 Adjusting carburettor
SERVICE INFORMATION SRM-5000
1. Start engine and warm it up well as follows.
(1) Warm engine up for approx. 1 minute at idle
speed.
(C)
(D)
(2) Warm it up alternating engine speed between
half-throttle speed (Partial speed approx. 6,000
r/min with nylon line head, 7,000 r/min with metal
blade) and idle speed every 2 seconds for 2 minutes.
(3) Turn H mixture needle anticlockwise until engine
speed drops to approx. 9,000 r/min (When using
metal blade : 9,500 r/min) at WOT.
(4) Warm it up alter nating 3 times of engine speed
between WOT for 1 minute and idling for 10 seconds.
2. Verify idle engine speed and adjust idle speed as
follows.
(1) Verify idle engine speed. When the speed is in
the range of 2,300 to 2,600 r/min, proceed to step 3.
(2) If the speed is not in this range, adjust idle mixture
needle (C) to reach maximum idle speed with 2.5
mm blade screw driver.
(3) Set idle speed to the range of 3 ,300 to 3,500
r/min by turning idle adjust screw (D).
(4) Turn idle mixture needle (C) anticlockwise to
reduce idle speed 900 to 1,000 r/min in the range of
2,300 to 2,600 r/min.
(F)
NOTE : Engine speed must be allowed to stabilize
minimum of 20 seconds after each adjustment to
assure accurate tachometer readings.
3. Adjust WOT engine speed as follows.
(1) Before adjusting carburettor, WOT engine speed
should be less than or equal to 9,000 r/min (When
using metal blade : 9,500 r/min). If engine speed is
higher than 9,000 r/min (When using metal blade :
9,500 r/min), turn H mixture needle (F) anticlockwise
at WOT to reduce the engine speed.
(2) Turn H mixture needle clockwise to obtain 9,900
to 10,100 r/min at WOT (W hen using metal blade :
10,800 - 11,200 r/min).
(3) Run engine alternating 4 times of engine speed
between WOT for 30 seconds and idling 5 seconds.
Then confirm WOT engine speed if in the range of
9,900 to 10,200 r/min (When using metal bl ade :
10,500 - 11 ,500 r/min). When engine dose not run
in this range, adjust H mixture needle again until
engine runs within 9,800 - 10,200 r/min (When using
metal blade : 10,500 - 11,500 r/min).
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2-3 Adjustin g ca rbur e tto r( co nti nue d)
ECHO
SERVICE INFORMATIONSRM-5000
(G)
9
4. Start engine again, and verify engine idle speed
ranges from 2,000 to 2,700 r/min, and WOT engine
speed ranges from 9,700 to 10,300 r/min (When
using metal blade : 10,500 - 12,000 r/min). Make
sure the cutting device does not rotate when engine
is idling. When final adjustment is completed, the
engine should idle, accelerate smoothly, and attain
WOT per above specification.
5. After adjusting carburettor, put new limiter plug
on the non thread side of limiter plug tool #91020
(G) as shown, and install new limiter plugs in idle
mixture needle hole and H mixture needle hole.
IMPORTANT : The limiter plugs must be installed
idle and H mixture needle hol es to comply with
Emission Directive.
NOTE : Initial carburettor setting (Idle adjust screw,
idle and H mixture needles) shown he re is to sta rt
the engine after restoration or carbure tto r change.
Idle adjust sc rew, idle and H mi xtur e ne edles turn
for designated engine revolution through procedures
indicated here may vary. As long as idl e and WOT
engine speed is set i n given range, the vari ance
would be ignorable.
ECHO
IMPORTANT : When the power is down while
operating unit, the user must clean air filter.
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