Echo PB-255ES User Manual
21-25F-00
PB-251, PB-255ES, ES-255ES
1
2
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 and directions in this SERVICE
DATA are based on the latest products information available at the time of publication.
INDEX
CONTENTS
1 SERVICE INFORMATION
1-1 Specifi cation ............................................... 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
CARBURETTOR ADJUSTMENT PROCEDURE
2
2-1 General adjusting rules ............................... 7
2-2 Presetting idle adjust screw, idle mixture
and hi speed (H) mixture needle
2-3 Adjusting carburettor................................... 8
Reference No.
.............................. 2
.......................... 7
21-25F-00
page
.. 7
needle
ISSUED: 200801
PB-251
PB-255ES
2
1 SERVICE INFORMATION
1-1 Specifi cations
Model PB-251 PB-255ES ES-255ES
Dimensions Length* mm(in) 340 (13.4)
Width* mm(in) 265 (10.4) 260 (10.2)
Height mm(in) 350 (13.8)
Dry weight with blower pipe** kg(lb) 4.5 (9.9) 4.8 (10.5) ---
with vacuum pipe and bag*** kg(lb) --- --- 5.9 (12.9)
Engine Type KIORITZ, air-cooled, two-stroke, single cylinder
Rotation Anticlockwise as viewed from the output end
Displacement cm
Bore mm(in) 34.0 (1.34)
Stroke mm(in) 28.0 (1.10)
Compression ratio 7.0
Carburettor Type
Model ZAMA RB-K85
Ignition Type CDI (Capacitor discharge ignition) system
Spark plug BPMR8Y
Exhaust Muffl er type Spark arrestor muffl er with catalyst
Starter Type Automatic rewind ES (effortless start)
Rope diameter x length mm(in) 3.0 x 815 (1/8 x 32.1)
Fuel Type
Mixture ratio 50 : 1 (2%)
Petrol Minimum 89 octane
Two-stroke engine oil
Tank capacity L (U.S.fl .oz.) 0.5 (16.9)
Blower Fan type Centrifugal, single stage
Blower pipe type Fan head
Max. air volume (with pipes)
m
Max. air velocity (with pipes)
m/s (mph)
Blower nozzle size, (inner) mm (in) 113 x 24 (4.5 x 0.94) oval shape
SERVICE INFORMATION
3
(in3) 25.4 (1.55)
Rotary type : Diaphragm, horizontal-draught, with primer purge bulb
Variable Slope Timing (VST) : Slope advance ignition
system combined with electronic speed governor
†
Premixed two-stroke fuel
3
/min ( ft3/min)
ISO-L-EGD (ISO/CD13738), JASO FC/FD
8.5 (300) 9.2 (325)
71 (159) 67 (150)
ES-255ES
*Without blower pipes **With all blower pipes
***With vacuum pipe and bag
†
Refer to Operator’s manual.
PB-251
PB-255ES
ES-255ES
1-2 Technical data
Model PB-251 PB-255ES ES-255ES
Engine
Idling speed r/min 2800 - 3400* 2700 - 3300* 2500 - 3100**
Wide open throttle speed r/min 7200 - 7500* 6000 - 6500**
Compression pressure MPa (kgf/cm
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 Ω 160 - 400
Secondary coil resistance kΩ 2.5 - 3.2
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 1000 r/min °BTDC 7
at 3000 r/min °BTDC 18
at 7000 r/min °BTDC 31
Carburettor
Idle mixture needle initial setting turns back 4 1/8
H mixture needle initial setting turns back 7/8
Idle adjust screw initial setting turns back 1 5/8
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
SERVICE INFORMATION
2
) (psi) 0.87 (8.9) (126)
3
BTDC: Before top dead centre.
*With fan head blower pipe.
** With vacuum pipe and bag.
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