Echo PB-251 Service Manual

SERVICE INFORMATION PB-251
2
1 SERVICE INFORMATION
1-1 Specifications
Dimensions Length* mm(in) 330 (13.0)
Width* mm(in) 265 (10.4)
Height mm(in) 360 (14.2)
Dry weight** kg(lb) 4.5 (9.9)
Engine Type KIORITZ, air-cooled, two-stroke, single cylinder
Rotation Counterclockwise as viewed from the output end
Displacement cm
3
(in
3
) 25.4 (1.55)
Bore mm(in) 34.0 (1.34)
Stroke mm(in) 28.0 (1.10)
Compression ratio 7.0
Carburetor Type Rotary type : Diaphragm, horizontal-draught, with purge bulb
Model ZAMA RB-K85
Ignition Type CDI (Capacitor discharge ignition) system
Variable Slope Timing (VST) : Slope advance ignition
system combined with electronic speed governor
Spark plug BPM8Y
Exhaust Muffler type Spark arrestor muffler with catalyst
Starter Type Automatic rewind
Rope diameter x length mm(in) 3.0 x 815 (1/8 x 32.1)
Fuel Type
†
Premixed two-stroke fuel
Mixture ratio 50 : 1 (2%)
Gasoline Minimum 89 octane
Two-stroke engine oil ISO-L-EGD (ISO/CD13738), JASO M345-FC/FD
Tank capacity L (U.S.fl.oz.) 0.5 (16.9)
Blower Fan type Centrifugal, single stage
Max. air volume (with pipes)
10.9 (386)
m
3
/min ( ft
3
/min)
Max. air velocity (with pipes)
63.5 (142)
m/s (mph)
Discharge ID
††
mm(in) 62 (2.44)
*Without blower pipes **With all blower pipes
†
Refer to Operator’s manual.
††
ID : Inner diameter

Echo PB-251 Specifications

General

Engine Displacement	25.4 cc
Air Speed	170 mph
Noise Level	70 dB(A)
Type	Handheld
Power Source	Gasoline
Fuel Capacity	16.9 fl oz