Occasionally riders will turn up with their own machine on a trailer or in a van for test and we have seen them refused due to the bike not being suitable. The details of what is required for each of the categories AM, A1, A2 or A are here. And the DVSA publish a full list of suitable models here.
As an example a Honda NC750X sounds, from engine size, that it is suitable for a Category A test however, it’s power output at 40kW is both too much to be an A2 motorcycle (between 20kW and 35kW) but not enough to be a Category A (at least 50kW). We have seen one disappointed rider turn up at a test centre with a shiny new NC750X having been misinformed by the dealer that it was suitable and not able to take his test.
It is good to see that electric motorcycles are now on the list of suitable machines as long as their continuous power rating meets the requirements for the petrol category equivalent and sustain this for at least 30 minutes.