Tri-Spark coils have extra windings using heavier wire and a high grade core for improved spark energy and duration. The appearance and dimensions are the same as the later Lucas type coil (17m12, 17m6) Diameter 40mm.
Warning - These coils discharge with a very high voltage so extra care must be taken to always have a spark plug connected to the HT output.
Use these 4-volt coils with wasted spark ignition systems for triple cylinder bikes (RITA etc). Not comptable with Tri-Spark ignition systems.
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