Yamabiko Echo SRM-2620ES User manual

Ref. No. 402-43
SRM-2620ES
SRM-2620TES
ECHO:
shindaiwa:
T262XS C262S
T262TXS C262TS
(Serial number: 37000001 and after)
Copyright C 2018 YAMABIKO Corporation All rights reserved.

INTRODUCTION
This service manual contains information for
service and maintenance of ECHO TRIMMER
/ BRUSHCUTTER, models SRM-2620ES,
SRM-2620TES, shindaiwa T262XS, C262S,
T262TXS and C262TS.
For systematic diagnosis, to avoid extra work
and time loss, please refer to “Troubleshooting
guide” that describes problems, testings, rem-
edies and references. We recommend you make
use of Operator’s Manual and Parts Catalogue
together with this manual when servicing.
We are constantly working on technical improve-
ment of our products. For this reason, technical
data, equipment and design are subject to
change without notice. All specifications, illustra-
tions and directions in this manual are based on
the latest products information available at the
time of publication.
NOTE: This service manual contains pictures
with different model name for other markets and
different colored model.

TABLE OF CONTENTS
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS 1
Page Page
1 SERVICE INFORMATION.....................................2
1-1 Specifications...................................................2
1-2 Technical data ..................................................3
1-3 Torque limits.....................................................5
1-4 Special repairing materials...............................5
1-5 Service limits....................................................6
1-6 Special tools.....................................................7
2 STARTER SYSTEM..............................................8
2-1 Disassembling starter assembly.......................9
2-2 Replacing starter rope....................................10
2-3 Replacing rope guide .....................................12
2-4 Installing rewind spring...................................12
2-5 Assembling starter..........................................13
2-6 Replacing starter pawl....................................15
3 IGNITION SYSTEM.............................................17
3-1 Troubleshooting guide....................................17
3-2 Testing spark..................................................18
3-3 Inspecting spark plug .....................................18
3-4 Inspecting ignition switch................................19
3-5 Replacing ignition switch................................20
3-6 Inspecting ignition coil resistance...................23
3-7 Replacing spark plug cap and coil..................24
3-8 Replacing ignition coil.....................................24
3-9 Setting pole shoe air gaps..............................25
3-10 Inspecting flywheel and key ...........................25
4 FUEL SYSTEM ...................................................27
4-1 Cleaning air filter ............................................28
4-2 Checking fuel cap and fuel strainer................28
4-3 Inspecting fuel tank and tank vent..................29
4-4 Replacing fuel line, fuel return line, tank vent
line and grommet............................................30
4-5 Adjusting carburetor.......................................32
4-5-1 General adjusting rules ..................................32
4-5-2 Initial setting Throttle adjust screw, L mixture
needle and H mixture needle ........................32
4-5-3 Adjusting carburetor.......................................33
4-6 Testing carburetor...........................................34
4-7 Inspecting crankcase pulse passage .............35
4-8 Inspecting metering lever height ....................35
4-9 Inspecting inlet needle valve..........................36
4-10 Inspecting diaphragm and others...................36
4-11 Replacing throttle cable and control parts......37
4-12 Checking and adjusting throttle cable ............37
5 CLUTCH SYSTEM..............................................38
5-1 Removing clutch shoes and springs...............39
5-2 Installing clutch shoes....................................39
5-3 Removing clutch drum....................................40
5-4 Removing clutch drum bearings.....................41
5-5 Installing bearings and clutch drum................41
6 ENGINE...............................................................42
6-1 Testing cylinder compression.........................43
6-2 Cleaning cooling air passages .......................43
6-3 Inspecting muffler and exhaust port...............44
6-4 Testing crankcase and cylinder sealing..........45
6-5 Removing and inspecting cylinder..................45
6-6 Inspecting piston and piston ring....................46
6-7 Replacing needle bearing...............................46
6-8 Inspecting crankcase and crankshaft.............47
6-9 Replacing oil seal...........................................47
6-10 Replacing ball bearing....................................48
6-11 Assembling crankshaft and crankcase...........48
6-12 Installing piston...............................................49
6-13 Installing piston ring and cylinder...................49
7 CUTTER DRIVE SYSTEM..................................50
7-1 Disassembling gear case...............................52
7-2 Replacing gears and PTO shaft.....................53
7-3 Assembling gear case....................................55
8 MAINTENANCE GUIDE......................................56
8-1 Service Intervals.............................................56
8-2 Disassembly Chart.........................................57
8-3 Troubleshooting guide....................................58

SERVICE INFORMATION
2SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
1 SERVICE INFORMATION
1-1 Specifications
Model SRM-2620ES (L)
T262XS SRM-2620TES (L) T262TXS SRM-2620ES (U) C262S SRM-2620TES (U) C262TS
Dimensions* Length mm (in) 1778 (70.0) 1789 (70.4) 1778 (70.0) 1789 (70.4)
Width mm (in) 340 (13.4) 695 (27.4)
Height mm (in) 311 (12.2) 445 (17.5) 497 (19.6)
Dry weight* kg (lb) 6.0 (13.3) 6.2 (13.7) 6.1 (13.5) 6.4 (14.3)
Engine Type YAMABIKO, 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 7.6
Carburettor Type Diaphragm, horizontal-draught
Model WALBRO WYG-9
Venturi size - Throttle bore mm (in) 10.5 - 10.5 (0.413 - 0.413)
Ignition Type CDI (Capacitor discharge ignition) system
Digital magneto
Spark plug NGK CMR7H
Exhaust Muffler type Spark arrester muffler with catalyst
Starter Type ES (Effortless-Start) / S (Soft-start)
Rope diameter x length mm (in) 3.5 x 850 (0.14 x 33.5)
Fuel** Type Premixed two-stroke fuel
Mixture ratio 50 : 1 (2%)
Petrol Minimum 89 octane
Two-stroke engine oil ISO-L-EGD (ISO/CD13738), JASO FC/FD
Tank capacity Full tank capacity: 0.6 (20.3)
L (U.S.fl.oz.) Usable capacity: 0.52 (17.6)
Clutch Type Centrifugal, 2-shoe pivot
Handle Type Front Crescent loop w/ cushion grip U-handle w/ integrated
control grip
Rear Integrated control grip w/ cushion
Drive shaft Type Solid type with spline (7-tooth)
Diameter - Length mm (in) 7 - 1540 (0.27 - 60.62)
Housing OD - ID mm (in) 25.0 - 22.0 (0.98 - 0.87)
Length mm (in) 1500 (59.1)
Gear case Reduction ratio 1.36 2.07 1.36 2.07
Gear tooth Spiral bevel gear
Lubrication Lithium based grease
Cutter Type Nylon line
cutter F4 Nylon line cutter Z5
Nylon line
cutter F4 Nylon line
cutter Z5
3-tooth blade
(230 mm)
Pilot diameter for blade 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. ** Refer to Operator’s manual.

SERVICE INFORMATION 3
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
1-2 Technical data
Engine
Compression pressure MPa (kgf/cm2) (psi) 0.97 (9.8) (140)
Clutch engagement speed r/min 4,100
Engagement Minimum†r/min 3,800
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Spark test
Tester gap w/ spark plug mm(in) 4.0 (0.16)
Tester gap w/o spark plug mm(in) 6.0 (0.24)
Secondary coil resistance Ω960 - 1,000
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 2,900 r/min °BTDC 9
at 6,500 r/min °BTDC 22
at 8,500 r/min °BTDC 33
at 11,000 r/min °BTDC 19
Carburettor
Test Pressure, minimum MPa (kgf/cm2) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 0.66 (0.03) lower than diaphragm seat
Tool to adjust mixture needles
Screwdriver 2.5 mm P/N X603-000050
D-shaped tool (S) P/N X645-000022
(Carb. adjustment tool P/N Y089-000094)
BTDC: Before top dead centre
†If clutch engagement speed is lower than minimum clutch engagement speed, replace clutch assembly with
new one.

SERVICE INFORMATION
4SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
Carburetor: WYG-9
L mixture needle
H mixture needle
Throttle adjust screw
Throttle plate
Engine side
1-2 Technical data (continued)
Model SRM-2620ES
T262XS, C262S SRM-2620TES
T262TXS, C262TS
Carburettor adjustment
Cutting head preparation Nylon line cutter F4 Z5
Line length (w/o shield)*1190 mm 285 mm
1) Initial setting
H mixture needle turn out 3
L mixture needle turn out 3 1/8
Throttle adjust screw turn out*27 3/4
Engine warm-up Idle - WOT : Total sec. 10 - 50 : 180
2) Find idle maximum speed Adjust L mixture needle to maximum idle speed*3
3) Set idle maximum speed w/ TAS r/min 4,000
4) Set idle speed
by turning L mixture needleACW r/min 3,000 (2,700 - 3,500)
5) Find WOT maximum speed Adjust H mixture needle to maximum WOT speed
6) WOT setting r/min Turn H mixture needle ACW
to decrease WOT speed by : 20 - 30
WOT engine speed with standard equipment 9,000 - 10,000* 10,400 - 11,800
r/min 11,000 - 11,900**
WOT: Wide open throttle ACW: Anticlockwise TAS: Throttle adjust screw
*With Nylon line cutter and shield. ** With 3-tooth blade (230 mm).
*1From eyelet on nylon head
*2Turn TAS clockwise until its head touches boss. Then turn TAS anticlockwise.
*3If clutch engages during adjustment process 2), decrease engine speed by turning TAS ACW until clutch
disengages and then redo 2).

SERVICE INFORMATION 5
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
1-3 Torque limits
Descriptions Size kgf•cm N•m in•lbf
Starter system Starter pawl assembly M8 70 - 110 7 - 11 60 - 95
Starter case M5 40 - 60 4 - 6 32 - 55
Ignition system Magneto rotor (Flywheel) M8 160 - 200 16 - 20 140 - 175
Ignition coil M5 40-60 4-6 32-55
Fan cover M5 50-70 5-7 45-60
Spark plug M10 100 - 150 10 - 15 87 - 130
Fuel system Carburettor M5 30 - 45 3 - 4.5 25 - 40
Intake insulator M5 30 - 45 3 - 4.5 25 - 40
Fuel tank with stand
Starter side M5* 40 - 60 4 - 6 32 - 55
Fan cover side M5* 50 - 70 5 - 7 45 - 60
Clutch Clutch shoe M6 70 - 110 7 - 11 60 - 95
Cylinder cover M5* 30 - 45 3 - 4.5 25 - 40
Engine Crankcase M5 70 - 110 7 - 11 60 - 95
Cylinder M5 70 - 110 7 - 11 60 - 95
Muffler M5 70 - 110 7 - 11 60 - 95
Muffler cover Starter side M5* 25 35 2.5 3.5 22 30
Crankcase side M5* 30 - 45 3 - 4.5 25 - 40
Other Cutter fastener LM10 280 - 320 28 - 32 245 - 280
Regular bolt, nut and screw M3 6-10 0.6-1 5-9
M4 15 - 25 1.5 - 2.5 13 - 22
M5 25 - 45 2.5 - 4.5 22 - 40
M6 45 - 75 4.5 - 7.5 40 - 65
M8 110 - 150 11 - 15 95 - 130
LM: Left hand thread * Apply thread locking sealant. (See below)
1-4 Special repairing materials
Material Location Remarks
Grease Drive shaft
Lithium based grease
Gear case
Rewind spring
Starter centre post
Oil seal inner lips
Thread locking sealant Fuel tank Loctite #242, ThreeBond #1324 or equivalent
Muffler cover
Cylinder cover

SERVICE INFORMATION
6SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
5K228 5K229 5K230
5K231 5K016 5K042
0123456789101112
0510
5K171 5K232
5K244
5K243
5K219
1-5 Service limits
ABCD
EFGH
K
Description mm (in)
A Cylinder bore When plating is worn and aluminum can be seen
BPiston outer diameter Min. 33.91 (1.335)
C Piston pin bore Max. 9.035 (0.3557)
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. 8.98 (0.3535)
G Piston ring width Min. 1.45 (0.057)
H Piston ring end gap Max. 0.5 (0.02)
KCon-rod small end bore Max. 12.025 (0.4734)
L Crankshaft runout Max. 0.03 (0.001)
MClutch drum bore Max. 59.5 (2.34)
LM

SERVICE INFORMATION 7
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
Ignition Air Gap Gauge
#.014 = .35mm
P/N 91004
PET-304
1.35
0.4
1.65
1.5
Made in Germany
T27x200
4 01 0 5 5 7 8 6 9 7 4 5
0
1
2
3
4
5
6
7
1-6 Special tools
12345
678910
11 12 13 14 15
16 17 19 20 22 2523
2418 21
Key Part Number Description Reference
1 G310-000050 Tachometer PET-304 Measuring engine speed to adjust carburettor
2 X602-000340 Torx wrench (T27) Removing and installing bolt
3 Y089-000094 Carburettor adjustment tool Adjusting carburettor
4A131-000160 Pressure connector Checking crankcase and cylinder leakages
5897719-02830 Piston holder Making piston steady to remove and install piston/ring
6Y089-000111 Puller Removing magneto rotor
7 P021-044870 PTO shaft puller Removing PTO shaft
8 897701-02830 Bearing wedge Removing ball bearings on cankshaft
9 897701-14732 Bearing tool Removing and installing ball bearings on crankcase
10 897702-30131 Piston pin tool Removing and installing piston pin (Use 8mm dia. adapter)
11 91004 Module air gap gauge Adjusting pole shoe air gaps
12 897563-19830 Metering lever gauge Measuring metering lever height on carburettor
13 897712-04630 2-pin wrench Removing and installing pawl carrier
14 897726-09130 Oil seal tool Installing crankcase oil seals
15 897800-79931 Spark tester Checking ignition system
16 897803-30133 Pressure tester Testing carburettor and crankcase leakages
17 900100-08008 Bolt Removing magneto rotor (flywheel), crankshaft from crankcase
18 V265-000200 Flange nut Removing magneto rotor (flywheel)
19 363018-00310 Washer Installing crankcase oil seal (starter side)
20 91037 Compression gauge Measuring cylinder compression
21 P021-051690 Adapter Measuring cylinder compression (Use with 91037)
22 91041 Pressure rubber plug Plugging exhaust port to test crankcase / cylinder leakages
23 897826-16131 Pressure rubber plug Plugging intake port to test crankcase / cylinder leakages
24 897827-16131 Pressure plate Plugging intake port to test crankcase / cylinder leakages
25 91149 Pressure / vacuum tester Testing crankcase / cylinder leakages

STARTER SYSTEM
8SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
2 STARTER SYSTEM
(A)
(A) Starter case
(B) Starter grip
(C) Rope guide
(D) Rewind spring
(d) End of rewind spring
(E) Rope reel
(F) Power spring
(f) Top end hookof power spring
(G) Pawl catcher
(H) Starter pawl
(J) Spring
(K) Pawl carrier
(L) Dust cover
(B)
(D)
(d)
(C)
(E)
(F)
(f)
(G)
(H)
(J)
(K)
(L)

STARTER SYSTEM 9
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
2-1 Disassembling starter assembly
1. Remove bolts (A) and muffler cover (B).
2. Remove bolts (C) and cylinder cover (D).
3. Remove bolts (E), washers (F) and bolt (K) un-
der fuel tank.
Remove fuel tank guard (G) and fuel tank (T).
4. Remove bolts (H) and starter assembly (J) from
unit.
B
D
E
H
A
C
F
J
G
K
T

STARTER SYSTEM
10 SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
2-1 Disassembling starter assembly (continued)
5. Pull out starter rope about 30 cm (12 in) and
hold rope reel (M) by hand. Loop excess rope in
rope reel notch (m) as shown.
6. Rotate rope reel (M) clockwise to release ten-
sion of rewind spring.
7. Remove tapping screw (L).
8. Remove pawl catcher (N) and power spring (P).
9. Remove rope reel (M) from starter case (S)
slowly, taking care of rewind spring (R) not to jump
out.
WARNING DANGER
Wear eye protection and take care when re-
moving starter drum, because rewind spring
may unwind suddenly and cause injury to
eyes and body.
M
m
P
M
L
R
N
S

STARTER SYSTEM 11
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
2-2 Replacing starter rope
1. Pull out knot (A) and clip (B). Untie knot (A).
2. Pull out knot (D) from rope reel (C).
3. When installing a new starter rope, singe both
ends of the rope to prevent from fraying.
WARNING DANGER
Do not use flame in an area where gasoline
is stored or flammable gases may exist.
4. Make a knot (D) at end of starter rope and pass
the starter rope through hole of rope reel, then
press the knot (D) into reel well as shown.
5. Pass the other end of starter rope through
rope guide on starter case, then pass starter rope
through starter grip and clip (B). Make a knot as
shown.
6. Tighten knot. Push knot in starter grip with clip
(B).
B
A
4K287
B
D
C
D
D

STARTER SYSTEM
12 SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
2-4 Installing rewind spring
WARNING DANGER
Use of eye protection and safety gloves are
strongly recommended while working on re-
wind spring.
If rewind spring unwinds unexpectedly, follow steps
1) to 4).
1) Wind rewind spring by hand. Then draw out
the end of rewind spring (A) as shown.
2) Wind drawn-out part (a1) to wound part (a2),
keeping wound part tight by hand (B) as shown.
Repeating this procedure several times, wind
rewind spring smaller than inner diameter of
starter case.
3) Retain rewind spring with pliers as shown.
Set rewind spring in starter case, hooking the
outer hook (a3) to the holder (c) of starter case
(C).
4) Apply small amount lithium based grease to
outside of rewind spring.
A
a1
a2
B
C
a3
c
2-3 Replacing rope guide
If rope guide is worn out or damaged, replace it as
follows:
1. Remove or break rope guide by prying from
starter case with a blade screwdriver.
2. Push out remaining guide from case.
3. Press new rope guide into starter case until it
bottoms with a sound of click.

STARTER SYSTEM 13
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
Rewind spring supplied as spare part is shipped in
temporary retainer.
To install new spring wound in retainer:
1) Align outer hook of spring in retainer with the
holder (c) of starter case.
2) Push spring down into the bottom of case,
keeping spring strongly pressed against case.
3) Spring should fall into starter case, and re-
tainer is detached by itself.
NOTE: Apply Lithium based grease in starter case.
1. Assemble rope reel (A) engaging hook (a1) of
rope reel with hook (B) of rewind spring.
2. Check for proper engagement of rewind spring
and rope reel by turning rope reel (A) clockwise
and counterclockwise.
3. Install power spring (C) assembling hook (c1) of
power spring into rope reel well (D).
c
2-4 Installing rewind spring (continued)
2-5 Assembling starter
A
C
a1
B
D
c1
A

STARTER SYSTEM
14 SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
4. Install pawl catcher, assembling power spring
hook (c2) into hole (e) of pawl catcher (E).
5. Fasten tapping screw (F) on starter post.
6. Pull out starter rope inside starter case. Ro-
tate rope reel counterclockwise several turns with
starter rope hooked at notch (a2) as shown. Hold
rope reel to prevent it from rewinding and pull out
starter grip to take the rope slack.
7. Pull starter several times to check rewind spring
tension. If starter is not rewinding fully, rotate rope
reel one more turn counterclockwise following
above step (6).
8. Pull out starter rope all the way, and check that
rope reel can be rotated an additional half or more
turn counterclockwise as shown, to prevent rewind
spring from breaking.
9. If not, reduce tension by rotating rope reel clock-
wise one turn with starter rope hooked at notch
(a2).
2-5 Assembling starter (continued)
E
c2
e
a2
F

STARTER SYSTEM 15
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
2-6 Replacing starter pawl
1. Remove starter assembly, and check starter
pawl (A) and pawl spring (B). Replace them if de-
fective.
2. Clean dirt around spark plug, and remove spark
plug.
3. Install rope (C) in spark plug hole to stop crank-
shaft rotation.
4. Rotate starter pawl assembly counterclockwise
by hand until it cannot be rotated further.
5. Remove starter pawl assembly rotating counter-
clockwise with 2-pin wrench 897712-04630 (D) as
shown.
NOTE: Do not use power tools. Otherwise, piston
damage may occur.
6. Remove E-ring (E) from pawl, and replace pawl
and spring.
7. Insert spring (B) to pawl and push pawl into hole
near mark “R“. Install E-ring (E).
8. Install starter pawl assembly onto crankshaft,
rotating clockwise by hand.
9. Tighten starter pawl assembly with 2-pin wrench
897712-04630 (D) as shown.
10. Remove rope (C) from spark plug hole and
reinstall spark plug. Reinstall starter assembly and
other parts.
A
B
C
E
D
C
A
B
D

STARTER SYSTEM
16 SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
2-6 Replacing starter pawl (continued)
NOTE: Insert rib (h) of starter case to gap (f) be-
tween crankacse and dust cover. Insert rib (j1) of
starter case to hole (g1) of crankacse. Insert rib (j2)
of starter case to hole (g2) of crankacse as shown.
j2
j1 h
g1
f
g2

IGNITION SYSTEM 17
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
3 IGNITION SYSTEM
(A) Flywheel
(B) Ignition coil
(C) Spark plug
(D) Spark plug cap coil
(E) Spark plug cap
(F) Ignition lead set
(G) Grommet
(H) Insulator tube
(J) Connector
3-1 Troubleshooting guide
Not
OK
Not
OK
Not
OK
OK
OK
OK
Spark plug
Spark
plug cap/
coil
Ignition
switch
Clean /
Regap /
Replace.
Replace.
Start
OK
OK
S.T.
Not
OK
S.T.
Not
OK
Not
OK
S.T.
OK
S.T.
Not
OK Pole
shoe air
gaps
Replace.
Not
OK OK
Not
OK
S.T.
OK
OK
Replace
ignition
coil.
Leads
connections
Not
OK
OK
OK
Not
OK
S.T.
Repair /
Replace.
Not
OK
Remedy
Inspect
Not
OK
Flywheel
key
OK
R.T.*
End
Not
OK
Flywheel
magnet
Replace.
Not
OK
R.T.
Not
OK
OK
OK
Replace ignition coil and / or inspect other
systems.
Replace flywheel.
OK
OK
Adjust pole shoe air gaps.
(Inspect flywheel magnet
at the same time. Go to
Aif OK.)
S.T.
Not
OK
A
S.T.: Spark test.
R.T.: Running test including actual cutting.
OK
OK
Secondary
coil
resist-
ances
(A)
(F)
(C)
(E) (D)
(J)
(G)
(H)
(B)

IGNITION SYSTEM
18 SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
3-2 Testing spark
1. Remove spark plug cap from spark plug.
2. Connect spark tester 897800-79931 (A) to high
tension lead and connect tester lead (B) on spark
plug.
3. Screw in adjuster (a1) until the needle tips con-
tact. Turn out adjuster (a1) 4 turns to set spark
tester gap (a2) to 4 mm (0.16 in).
4. Turn ignition switch to “RUN” position. Pull start-
er grip several times.
5. If spark is steady in blue or white at the tester
gap, ignition system is considered good. Go to in-
specting spark plug.
6. If no spark exists or spark is nonsequential in
yellow, orange, or red, continue with further inspec-
tion.
DANGER
*Do not test near spark plug hole without
spark plug installed, otherwise there is a
chance to ignite fuel mixture inside cylinder.
*Do not touch metal parts of spark tester
while performing the test to avoid receiving
electrical shock.
DANGER
Do not check spark in area where gasoline
is spilled or flammable gases may exist.
3-3 Inspecting spark plug
1. Remove spark plug to inspect for fouling,
cracked or broken insulator, or rounded center
electrode. Clean or replace spark plug as required.
2. Set spark plug gap (A) by bending outer elec-
trode (B).
Standard : 0.6 to 0.7 mm (0.024 to 0.028 in)
3. If engine does not start with correct spark plug,
inspect if spark plug is wet or dry. If it is exces-
sively wet or dry, inspect fuel system.
A
B
GASO
LINELINE
a2
B
A
a1