Technical Data - Echo PB-251 Service Manual

PB-251

1-2 Technical data

Engine
Idling speed*
Wide open throttle speed*
Compression pressure
Ignition system
Spark plug gap
Minimum secondary voltage at 1500 rpm
Primary coil resistance
Secondary coil resistance
Pole shoe air gaps
Ignition timing
Carburetor
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 center.
*With all blower pipes.
**Refer to page 7 on 2-2 initial idle adjust screw.
SERVICE INFORMATION
rpm
rpm
MPa (kgf/cm 2 ) (psi)
mm (in)
kV
kΩ
mm(in)
at 1000rpm
°BTDC
at 3000rpm
°BTDC
at 7000rpm
°BTDC
turns back
turns back
turns back**
MPa (kgf/cm 2 ) (psi)
mm (in)
0.81 (8.3) (118)
0.6 - 0.7 (0.024 - 0.028)
Ω
0.3 - 0.4 (0.012 - 0.016)
0.05 (0.5) (7.0)
0.1 - 0.25 (0.004 - 0.010) lower than diaphragm seat
2800 - 3200
6700 - 7200
15
160 - 400
2.5 - 3.2
6.5
17.5
31.0
5 3/8
1 1/8
5
3