SERVICE INFORMATIONPB-251
3
1-2 Technical data
Engine
Idling speed* rpm 2800 - 3200
Wide open throttle speed* rpm 6700 - 7200
Compression pressure MPa (kgf/cm
2
) (psi) 0.81 (8.3) (118)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1500 rpm kV 15
Primary coil resistance Ω 160 - 400
Secondary coil resistance kΩ 2.5 - 3.2
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 1000rpm °BTDC 6.5
at 3000rpm °BTDC 17.5
at 7000rpm °BTDC 31.0
Carburetor
Idle mixture needle initial setting turns back 5 3/8
H mixture needle initial setting turns back 1 1/8
Idle adjust screw initial setting turns back** 5
Test Pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 0.1 - 0.25 (0.004 - 0.010) lower than diaphragm seat
BTDC: Before top dead center.
*With all blower pipes.
**Refer to page 7 on 2-2 initial idle adjust screw.
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