Sym GTS 250, Service Manual

Page: 193 / 217

17. Electrical System
17-2
Maintenance Data
Operational precaution
y When remove the battery, the disconnection sequence of cable terminals shall be strictly observed.
(First disconnect the negative cable terminal, next, the positive cable terminal.)
y The model of the spark plug and the tightening torque.
y The ignition timing.
y Adjustment of headlight.
y Removal and installation of AC generator.
y The maintenance free battery requires no inspection of electrolyte level and refilling of distilled water.
y
To recharge the battery, remove the battery from rack without removing ventilation caps.
y
Unless in emergency, never rapid charge the battery.
y
The voltage must be checked with the voltmeter while charging the battery.
y
As C.D.I assembly does not require an ignition timing check. In case ignition timing is incorrect, check
C.D.I and AC generator. Verify with an ignition timing light after replacement if necessary.
Technical Specification
Charging system
Description Specification
Capacity 12V10Ah
Battery
Charging rate
1.2A / 10hr (standard)
17A / 0.5hr (fast charging)
Leak current Below 1mA
Charging current 1.2A / 1500 rpm
Control voltage in charging 14.5+0.5 V / 2,000 rpm
Ignition system
Description Specification
Model NGK CR7HSA (Recommended)
Spark plug
Gap 0.6~0.7 mm
Primary winding 0.17±10% Ω
Without cap:9 ± 20% K Ω
Ignition coil and
resistance
Secondary winding
With cap:14.1 ± 20% K Ω
Pulse generator 480~550 Ω
10° TDC / 2500 rpm ”F” mark
26° TDC / 3500 rpm
30° TDC / 6000 rpm
Ignition timing
16° TDC / 8300 rpm
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