Echo PB-655, Service Data

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SERVICE INFORMATION
PB-655
PB-755 3
1-2 Technical data
Model PB-655 PB-755
Engine
Idling speed r/min 2400 - 2800
Wide open throttle speed r/min 6800 - 7300
Compression pressure MPa (kgf/cm
2
) (psi) 1.05 (10.7) (152)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1000 r/min kV 12
Primary coil resistance Ω 150 - 250
Secondary coil resistance k Ω 1.2 - 1.8
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing ° BTDC 30
Carburettor
Venturi size mm(in) 15.0 (0.591)
Throttle bore mm(in) 15.0 (0.591)
Idle adjust screw initial setting turn back* 8
Idle mixture needle initial setting turn in** 10
H mixture needle initial setting turn back 3 3/4
Test Pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm (in) 1.5 (0.06) lower than diaphragm seat
BTDC: Before top dead centre.
* Refer to page 7 on 2-2 initial idle adjust screw.
** Screw in idle mixture needle from initial thread engagement (at the point that the clicking sound is heard).