Echo PB-760LN H Operating manual

PB-760LN H, PB-760LN T
21-63J-00 1
2
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   
   
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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
MANUAL SUPPLEMENT are based on the
latest product information available at the
time of publication.
CONTENTS
page
1 SERVICE INFORMATION.............................. 2
1-1 Specication ............................................... 2
1-2 Technical data............................................. 3
1-3 Torque limits................................................ 3
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 Complete adjustment.................................. 7
Reference No. 21-63J-00
ISSUED: 201211

SERVICE INFORMATION PB-760LN T/H
2
1 SERVICE INFORMATION
1-1 Specications
Model PB-760LN T PB-760LN H
Dimensions Length* mm(in) 375 (14.8)
Width* mm(in) 490 (19.3) 535 (21.1)
Height* mm(in) 475 (18.7)
Dry weight** kg(lb) 11.9 (26.2) 12.0 (26.4)
Engine Type YAMABIKO, air-cooled, two-stroke, single cylinder
Rotation Counterclockwise as viewed from the output end
Displacement cm3(in3) 63.3 (3.86)
Bore mm(in) 48.0 (1.89)
Stroke mm(in) 35.0 (1.38)
Compression ratio 5.8
Carburetor Type
Rotary type : Diaphragm, horizontal-draft, with separated purge bulb
Model Walbro WYK-387 with Small D-shaped mixture needle
Ignition Type CDI (Capacitor discharge ignition) system
Variable Slope Timing (VST) : Slope advance ignition
system combined with electronic speed governor
Spark plug BPM6Y (CANADA : BPMR6Y)
Exhaust Mufer type Spark arrester mufer with catalyst
Starter Type Automatic rewind
Rope diameter x length mm(in) 3.5 x 1000 (0.14 x 39.37)
Fuel Type Premixed two-stroke fuel
Mixture ratio 50 : 1 (2 %)
Gasoline Minimum 89 octane unleaded
Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO M345-FC/FD
Tank capacity L (U.S..oz.) 1.98 (67.0)
Throttle Mount Tube-mounted throttle Hip-mounted throttle
with cruise control with cruise control
Blower Fan type Closed fan
Max. air volume (with pipes)
m3/min (ft3/min) 16.6 (585)***
Max. air velocity (with pipes)
m/s (mph) 87.2 (195)***
Discharge ID mm (in) 63 (2.48)***
ID : Inner diameter.
* Without exible pipe and blower pipes.
** With exible pipe and blower pipes.
*** With taper pipe.

SERVICE INFORMATIONPB-760LN T/H 3
1-2 Technical data
Model PB-760LN T PB-760LN H
Engine
Idling speed* RPM 2,500 +/- 200
Wide open throttle speed* RPM 5,800 - 6,200
Compression pressure MPa (kgf/cm2) (psi) 0.81 (8.3) (118)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1,500 RPM kV 22
Primary coil resistance 300 - 350
Secondary coil resistance k 2.5 - 2.9
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 3,000 RPM °BTDC 16
at 6,000 RPM °BTDC 23
PET-9000 Parameter 1 307
Parameter 2 00
Carburetor
Venturi size mm(in) 12.2 (0.5)
Throttle bore mm(in) 12.2 (0.5)
Idle adjust screw initial setting turns in** 5/8
Idle mixture needle initial setting turns in*** 6 1/2
Hi speed mixture needle initial setting turns out 3 5/8
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
BTDC: Before top dead center. *With all blower pipes.
** Set idle adjust 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).
1-3 Torque limits
Descriptions Size kgf  cm Nm inlbf
Starter Starter pawl assembly M 10 80 - 100 8 - 10 70 - 90
system Starter case M 5* 25 - 45 2.5 - 4.5 22 - 40
Ignition Flywheel M 10 200 - 240 20 - 24 175 - 210
system C.D.I module M 5 60 - 90 6 - 9 50 - 80
Fuel Spark plug M 14 130 - 170 13 - 17 115 - 150
system Carburetor M 5 30 - 40 3 - 4 26 - 35
Intake bellows M 5* 60 - 90 6 - 9 50 - 80
Fuel tank M 5* 20 - 40 2 - 4 17 - 35
Engine Crankcase M 5 70 - 110 7 - 11 60 - 95
Cylinder M 5 70 - 110 7 - 11 60 - 95
Engine plate M 5 20 - 30 2 - 3 17 - 26
Engine mount M 6* 130 - 180 13 - 18 115 - 160
Cylinder cover M 5* 20 - 30 2 - 3 17 - 26
Engine cover Crankcase side M 5* 25 - 45 2.5 - 4.5 22 - 40
Fan case side M 5 30 - 45 3 - 4.5 26 - 35
Cleaner case side M 5 35 - 55 3.5 - 5.5 30 - 48

SERVICE INFORMATION PB-760LN T/H
4
Descriptions Size kgf  cm Nm inlbf
Engine Dust cover M 5* 25 - 45 2.5 - 4.5 22 - 40
Mufer M 6 130 - 180 13 - 18 115 - 160
Mufer stay M 5 70 - 110 7 - 11 60 - 95
Exhaust guide M 4 15 - 30 1.5 - 3 13 - 26
Others Fan case Blower grid side M 5 20 - 30 2 - 3 17 - 26
Fan case lid M 5 25 - 35 2.5 - 3.5 22 - 30
Form pad M 5 20 - 30 2 - 3 17 - 26
Blower fan M 10 200 - 240 20 - 24 175 - 210
Backpack harness M 5 40 - 60 4 - 6 35 - 50
Backpack frame M 5 40 - 50 4 - 5 35 - 45
Backpack stopper M 5 35 - 45 3.5 - 4.5 30 - 40
Cleaner case M 5 30 - 50 3 - 5 26 - 45
Trigger bracket xture M 5 35 - 55 3.5 - 5.5 30 - 50
Throttle lever M 6 35 - 55 3.5 - 5.5 30 - 50
lead M 5 30 - 45 3 - 4.5 26 - 40
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
* Apply thread locking sealant (See below)
1-3 Torque limits (Continued)
1-4 Special repairing materials
Material Location Remarks
Grease Rewind spring Lithium based grease or ECHO XTended
Protection TM Lubricant
Starter center post
Oil seal inner lips
Thread locking sealant Engine mount Loctite #675 or equivalent
Dust cover Loctite #242, ThreeBond #1324 or equivalent
Engine cover (Crankcase side)
Starter case
Loctite #222, ThreeBond #1342 or equivalent
Fuel tank
Cylinder cover
Intake bellows

SERVICE INFORMATIONPB-760LN T/H 5
Description mm (in)
A Cylinder bore When plating is worn and aluminum can be seen
B Piston outer diameter Min. 47. 89 (1.885)
C Piston pin bore Max. 10. 035 (0.3951)
D Piston ring groove, 1st Max. 1. 65 (0.065)
2nd Max. 1. 6 (0.063)
E Piston ring side clearance Max. 0. 1 (0.004)
F Piston pin outer diameter Min. 9. 98 (0.3929)
G Piston ring width Min. 1. 45 (0.057)
H Piston ring end gap Max. 0. 6 (0.02)
K Con-rod small end bore Max. 14. 025 (0.5522)
L Crankshaft runout Max. 0. 01 (0.001)
5K249 5K250
5K251 5K016 5K042
5K248
5K247
5K252
5K219 5K220
ABCD
EF GH
KL
1-5 Service limits

SERVICE INFORMATION PB-760LN T/H
6
a
OPP AMA
PET -9 00 0
INTEGRATED IGNITION ANALYZER
b
14
352
67: a = 8mm
8: a = 10 mm
9 10 11
1312 15 16
191817 20
1-6 Special tools
21 22
14
Key Part Number Description Used for:
1 G310-000050 Tachometer PET-304 Measuring engine speed to adjust carburetor
2 91004 Module air gap gauge Adjusting pole shoe air gaps
3 X605-000050 Torx L wrench Removing and installing bolt
4 897501-03938 Puller Removing magnetor rotor
5 897537-30130 Piston stopper Locking crankshaft rotation
6 897900-00001 Metering lever gauge Measuring metering lever height on carburetor
7 897558-02830 T-socket wrench(8mm) Removing and installing hex.bolt (M5)
8 897558-10230 T-socket wrench(10mm) Removing and installing hex.bolt (M6)
9 897701-14732 Bearing tool Removing and installing crankcase ball bearings
10 897702-30131 Piston pin tool Removing and installing piston pin (Use 10 mm dia. adapter.)
11 897712-07930 2-pin wrench Removing and installing pawl carrier
12 91101 Piston holder Making piston steady to remove and install piston/rings
13 897726-21430 Oil seal tool Installing crankcase oil seal
14 990511-30023 Spark tester Checking ignition system
15 897803-30133 Pressure tester Testing carburetor and crankcase leakage
16 897826-16131 Rubber plug Testing crankcase and cylinder leakage
17 897827-16131 Pressure plate Testing crankcase and cylinder leakage
18 897834-79930 Rubber plug Testing crankcase and cylinder leakage
19 91018 Pressure connector Testing crankcase and cylinder leakage
20 91037 Compression gauge Measuring cylinder compression
21 91059L D-shaped tool Adjusting mixture needle
22 900300 Ignition Analyzer : PET-9000 Measuring Ignition timing, Primary/Secondary voltage engine speed