Gilera Nordwest, Workshop Manual

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Electrical system
Ignition
Two systems were used;
Early bikes up to 228 51763 use the Captive Discharge system.
Bikes 228 51764 and on use the Inductive Discharge system.
Capacitive Discharge:
Recognisable by; 6 wires from ignition switch, separate rev limiter box
(pink and green wires), 9 wires from ignition box, 3 groups of wires from
alternator, 2 fuses.
Charger coil: Part of stator part no. 324471
Resistance test: 218 ohms + 10% (pink and green)
Pick-up coil: Part no. 324433
Resistance test: 117 ohms + 10% (white/green - yellow/black)
117 ohms + 10% (yellow/blue - yellow/black)
HT coil: Part no. 328647
Primary res: 0.2 - 0.3 ohm + 10% (white/light blue - black)
Secondary res: 9.2 K ohms + 10% (white/light blue - HT)
Inductive Discharge:
Recognisable by; 4 wires from ignition switch, no separate rev limiter,
7 wires from ignition box, 2 groups of wires from alternator, 3 fuses.
Because the Inductive system gets its power from the battery, if the
battery is getting flat (below 6 V), the control box will disable the ignition
to protect the circuit. The motor may turn, but engine will not start / no
spark.
Pick-up coil: Part no. 947125
Resistance test: 150 ohms + 10% (yellow/black - yellow/dark blue)
HT coil: Part no. 946789
Primary res: 4.0 ohms + 10% (white/light blue - red/dark blue)
Secondary res: 13.8 K ohms + 10% (red/dark blue - HT)
Timing: 7 deg (static). 30 deg at 4,000 rpm not adjustable
Spark plug: Champion RA4HC
NGK DPR9EA9 or DPR9EV9
Nippon Denso X27 EPRU-9 or EPRZU-9
Gap: 0.6 - 0.7 mm
Torque: 12 to 15 Nm. (put “Copper Slip” on threads)
Cap res: 1 K ohm
Charging circuit: Three phase. AC alternator
Battery: 12 volt, 14 Ah Yuasa YB14-LA2
Regulated voltage: 13.5 - 14 volts DC regulator/rectifier
A 2