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Castrol Bike

HT Leads


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High tension leads are the wires that connect a distributor, ignition coil, or magneto to each of the spark plugs in internal combustion engines.

High tension leads, like many engine components, wear out over time. Each lead contains only one wire, as the current does not return through the same lead, but through the earthed/grounded engine which is connected to the opposite battery terminal.

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