Thanks for the replies folks. I have an Ariel VB600 so used to starting - or not - big singles. I appreciate the technique varies from bike to bike though. Points noted about the clutch etc. I am assured all is well, but they all say that. It has a Venom piston and cam, a monobloc carb to suit - everything else is allegedly original. Frankly, I just like the noise they make, the low down torque and the relative simplicity of a single, but yes, well aware of the added "features" Not sure if they are good or bad news.