Gilera Nordwest, Workshop Manual

Page: 107 / 136

HT Coil test
Remove the petrol tank and seat.
Disconnect the electrical wires and spark plug cap.
Remove the ignition coil.
Measure the resistance between coil te and -.
Standard resistance: 0.2 ÷ 0.3
Ω
±10% at 20°C.
If there is no continuity, replace coil.
Measure the resistance between the electrical wire terminal and the high
tension wire without spark plug cap.
Standard value: 9.2 k
Ω
± 10% at 20°C (fig. 4).
If the ohmic value is very different from the standard value, replace the coil.
CDI control unit test
The normal tester results are not reliable; therefore it is advisable to replace
the CDI control unit.
Revolution reduction test
The normal tester results are not reliable; therefore it is advisable to replace
the revolution reductor.
Spark plug cap resistance: 1 k
Ω
(fig. 5).
Replace if out of specification.
Spark plug
Check spark plug condition: in case it is
overheated, fouled or worn, replace it.
Measure electrode gap;
Gap 0.6 ÷ 0.7 mm.
If it is out of specification, clean and adjust it.
Spark plug must be checked every 1,000 km and replaced every 8,000 km.
Warning: The spark plug use, having different heat ranges or incorrect
thread, may cause serious damages to the engine.
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