PIAGGIO Vespa 150 1962 Operation And Maintenance Manual page 8

Ignition by an external H. T. coil with primary winding fed by another coil inside the flywheel
magneto (see Fig. 5). Use one of the following sparkplugs:
- AC 43F
- Champion L86
- KLG F70 or F75
Fig. 5 - Ignition diagram
1. Ignition coil in flywheel magneto
4. Breaker
8
5. Condenser 6. Sparkplug
- Marelli CW 230 A-T or CW 225 N-T
- Bosch W225T1
2. External H. T. coil 3. Rotor cam
7. Engine cut-out on switch.