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Thanks for that, made a lot of sense.

Question - why do m/cs use narrow band sensors? Is it due to cost over wideband and there are less (for now) regulations of m/c emissions?

Point of interest - people often think that 13:1 a/f ratio means 13 parts of air to 1 part of fuel, which is true but it is a ratio of weight, whereas in reality vehicles really use air and fuel in a volume capacity so 13:1 by weight is around 30,000 parts of air to 1 part of fuel by volume (cos air doesn't weigh much!). In other words, 1 litre of fuel takes in approx 30,000 litres of air.

Keep up the videos, enjoyable watching from the other side of the pond

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