OEM spark plug by Champion with short thread and the short designation L78C.
The spark plug fits various Vespa scooters such as V50 and PK 50 S-XL2.
When troubleshooting Vespa electrical issues, replacing the spark plug and spark plug wire provides a reasonable starting point.
The Champion L78C spark plug is equivalent to a NGK B8HS.
In the guide, you can find the right spark plug for your Vespa, including conversions and recommendations.
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