One of the most important checks is the lambda sensor. You will have seen from previous posts that this is a sore point on the Superspec. I’m pleased to report that mine continues to work perfectly. The pictures show the whole 20 minutes and a snap shot of a 2 min segment. It’s a fairly crude system that we used to call the ‘bang-bang’ method (maybe they still do?). Rather than try and stabilise the fuel/air ratio it goes from rich to lean in a very fast cycle so that over time the average mixture is correct.