Kioritz Echo SRM-2305 Mounting instructions

SRM-2305, SRM-2305SI10-21L-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.
1
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, L mixture needle
and H mixture needle ........................................ 7
2-3 Adjusting carburettor .................................. 8
Reference No. 10-21L-01
REVISED: 200502
INDEX ISSUED: 200410

SERVICE INFORMATION SRM-2305 SRM-2305SI
2
1 SERVICE INFORMATION
1-1 Specifications
Model SRM-2305 (L) SRM-2305 (U) SRM-2305SI(L) SRM-2305SI(U)
Dimensions Length* mm(in) 1755 (69.1) 1760 (69.3) 1785 (70.3) 1790 (70.5)
Width mm(in) 355 (14.0) 690 (27.2) 355 (14.0) 690 (27.2)
Height mm(in) 340 (13.4) 455 (17.9) 340 (13.4) 455 (17.9)
Dry weight** kg(lb) 5.6 (12.3) 6.0 (13.2) 5.8 (12.8) 6.2 (13.7)
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 6.8
Carburettor Type Diaphragm, horizontal-draught, with primer (purge bulb)
Model ZAMA C1U-K53B
Venturi size-Throttle bore mm(in) 8.5 - 12.7 (0.33 - 1/2)
Ignition Type CDI (Capacitor discharge ignition) system
Spark plug BPMR7A
Starter Type Automatic rewind -start
Rope diameter x length mm(in) 3.0 x 1000 (0.12 x 39.4) 3.0 x 920 (0.12 x 36.2)
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
Tank capacity L (U.S.fl.oz.) 0.4 (13.5)
Clutch Type Centrifugal, 2 - shoe slide
Handle Type Front Slant D-Loop U-shaped Slant D-Loop U-shaped
Rear Integrated control - - - Integrated control - - -
grip w/cushion grip w/cushion
Drive shaft Type Solid
Inner shaft: Diameter - Length mm(in) 6 - 1538 (0.24 - 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 INFORMATION
SRM-2305
SRM-2305SI 3
1-2 Technical data
Engine
Idling speed r/min 2400 - 3200
Operating speed r/min 7500
Wide open throttle speed* r/min 8200 - 10000
Clutch engagement speed r/min 3400 - 4000
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 1500 r/min kV 20
Secondary coil resistance kΩ1.0 - 2.0
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 7000 r/min °BTDC 28
Carburettor
Idle adjust screw initial setting turn in** 2 3/4
L mixture needle initial setting turns back 1 1/4
H 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.
** Set idle adjust screw to contact throttle plate before initial setting.

SERVICE INFORMATION SRM-2305 SRM-2305SI
4
1-3 Torque limits
Descriptions Size kgf•cm N•m in•lbf
Starter Pawl carrier M 8 160 - 200 16 - 18 140 - 175
system Starter case M 5*20 - 40 2 - 4 17 - 35
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
Fuel Carburettor insulator M 5** 25 - 40 2.5 - 4.0 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
Stand M 4** 14 - 28 1.4 - 2.8 12 - 24
Clutch Clutch hub M 8 160 - 200 16 - 20 140 - 175
Clutch case M 5 30 - 45 3.0 - 4.5 26 - 35
Engine Crankcase M 5†70 - 110 7 - 11 60 - 95
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
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. *Tapping screw
** Apply thread locking sealant. (See below)
† The torque differences among four bolts should not exceed 20 kgf•cm (2Nm, 17in•lbf) on one cylinder or
crankcase.
1-4 Special repairing materials
Material Location Remarks
Adhesive Clutch case, cushion Loctite 406 or equivalent
Thread locking sealant Carburettor insulator
Fuel tank ThreeBond 1342 or equivalent
Stand
Grease Gear case
Rewind spring Lithium based grease
Starter center post

SERVICE INFORMATION
SRM-2305
SRM-2305SI 5
0
5
10
12345678910 11
5K193
5K016 5K042 5K194
5K171
5K228 5K229 5K230
5K231
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. 32.14 (1.265)
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. 0.05 (0.002)
L Clutch drum bore Max. 51.5 (2.03)

SERVICE INFORMATION SRM-2305 SRM-2305SI
6
20
20
40
40
60
60
80
80
120
120
140
140
160
160
180
180
20
20
100
100
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 900600-00012 Washer Installing drive gear
4 895610-79920 L-hex wrench (4 mm) Removing and installing hex. socket bolts (M5)
5 897603-23030 PTO shaft puller Removing driven (PTO) shaft
6 897701-06030 Bearing wedge Removing ball bearings on crankshaft
7 897701-14732 Bearing tool Removing and installing crankcase ball bearings
8 897702-30131 Piston pin tool Removing and installing piston pin (Use 8 mm dia. adapter.)
9 897705-11520 Bearing tool Removing and installing con-rod small end needle bearing
10 897712-04630 2-pin wrench Removing and installing pawl carrier
11 897714-24330 Oil seal tool Installing crankcase oil seals
12 897726-09130 Oil seal tool Removing clutch drum and installing clutch drum ball bearing
13 897800-79931 Spark tester Checking ignition system
14 897803-30130 Pressure tester Checking carburettor and crankcase leakages
15 897835-16131 Pressure connector Checking crankcase and cylinder leakages
16 433019-12330 Flange nut Removing magneto rotor (flywheel)
17 900100-08008 Bolt Removing magneto rotor (flywheel)
18 91007 Compression gauge Measuring cylinder compression
1-6 Special tools
1
7
15
8
16
4
9
17
11
6
10 13
14
12
18
235

SERVICE INFORMATION
SRM-2305
SRM-2305SI 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, L mixture needle and H mixture needle
1. Remove air cleaner cover and air cleaner.
2. Turn L mixture needle clockwise until lean stop to
cut easily.
3. Using a sharp knife, give triangle cut between
the stopper wings. Also cut the H limiter cap.
NOTE :Be careful when cutting caps, otherwise
injury may result.
4. Pull the caps off with pliers.
NOTE : Do not rock back and forth when removing,
otherwise the needle may be damaged.
5. Turn H and L mixture needles clockwise until
lightly seated.
NOTE : Do not over tighten needles, otherwise
needles tip and seat damage may occur.
6. Turn L mixture needle anticlockwise 1 1/4 turns.
Turn H mixture needle anticlockwise 1 3/8 turns.
7. Turn idle adjust screw anticlockwise and set the
screw until the tip to just contact throttle plate. Then
turn it clockwise 2 3/4 turns.
8. Install air cleaner and air cleaner cover.

SERVICE INFORMATION SRM-2305 SRM-2305SI
8
2-3 Adjusting carburettor
1. Start engine and warm it up well for about 3 - 5
minutes with cycle of 50 seconds at WOT (Wide
Open Throttle) and 10 seconds at idling.
2.Adjust L mixture needle and obtain maximum idle
speed with 2.5 mm wide blade head screw driver.
3. Set idle speed to the range of 3500 to 3600 r/min
by turning idle adjust screw.
4. Turn L mixture needle anticlockwise to reduce
idle speed 800 r/min to set idle speed in the range
of 2700 to 2800 r/min.
NOTE : Engine speed must be allowed to stabilize
a minimum of 20 seconds after each adjustment of
L mixture needle to assure accurate tachometer
readings.
5. Adjust WOT engine speed in the range of 8200
to 10000 r/min by turning H mixture needle.
6.After adjusting carburettor, install White limiter cap
on L mixture needle and Red limiter cap on H mixture
needle as shown.
NOTE : Before installing limiter caps, warm caps in
90 °C hot water for smooth installation. Make it sure
to use pliers or appropriate instrument to take
warmed up cap out from the water.
7. Press respective limiter caps to the bottoms as
shown.
8. Start engine again and make it sure engine runs,
in the range of 2400 to 3200 r/min at idling and the
range of 8200 to 10000 r/min at WOT. Also make it
sure cutting device would not turn at engine idle
speed and suitable acceleration.