Technical Data - Echo PB-251 Service Data

PB-251
PB-255ES
ES-255ES

1-2 Technical data

Model
Engine
Idling speed
Wide open throttle speed
Compression pressure
Ignition system
Spark plug gap
Minimum secondary voltage at 1500 r/min
Primary coil resistance
Secondary coil resistance
Pole shoe air gaps
Ignition timing at 1000 r/min
at 3000 r/min
at 7000 r/min
Carburettor
Idle mixture needle initial setting
H mixture needle initial setting
Idle adjust screw initial setting
Test Pressure, minimum
Metering lever height
BTDC: Before top dead centre.
*With fan head blower pipe.
** With vacuum pipe and bag.
SERVICE INFORMATION
r/min 2800 - 3400*
r/min
2
MPa (kgf/cm ) (psi)
mm(in)
kV
Ω
kΩ
mm(in)
°BTDC
°BTDC
°BTDC
turns back
turns back
turns back
2
MPa (kgf/cm ) (psi)
mm(in) 0.1 - 0.25 (0.004 - 0.010) lower than diaphragm seat
PB-251 PB-255ES
2700 - 3300*
7200 - 7500*
0.87 (8.9) (126)
0.6 - 0.7 (0.024 - 0.028)
15
160 - 400
2.5 - 3.2
0.3 - 0.4 (0.012 - 0.016)
7
18
31
4 1/8
7/8
1 5/8
0.05 (0.5) (7.0)
3
ES-255ES
2500 - 3100**
6000 - 6500**