This extended rotor button fits inside the distributor cap on your TB42 carburettor engine. It is a specific replacement part required when upgrading your old points ignition to a Pertronix electronic ignition system. The standard rotor button is too short for this conversion, resulting in a poor air gap between the rotor and the cap terminals. A weak or inconsistent spark is the result, leading to misfiring, rough running, poor fuel economy, and hard starting. This extended button ensures a strong, reliable spark is delivered to the correct cylinder every time.
This rotor button is designed ONLY for vehicles that have been fitted with a Pertronix electronic ignition conversion kit. It is not a suitable replacement for a standard points ignition system. Please contact us with your VIN if you require assistance confirming fitment.