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).
