Whilst you could be asked about cleaning the electrodes, pointing out erosion, checking plug types and testing the electrode gap with feeler gauges, in reality the assessment is much easier. So, to find out more about this section, click on Read More...You'll need to be able to give the assessor an idea of the state of engine tune based on the colour of deposits on the electrodes.
You can find out more about spark plugs here, or click on the audio broadcast below to hear what the assessment schedule says.
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