Quick question re a new Wisper bike. I am thinking of buying a new Wisper 905 or Tailwind to replace my Wisper 705t. The give the option of a full throttle which is something I am not interested, on our present 705 t it has a throttle which we just used for starting off on slight inclines etc. Does this sort of throttle come as standard on Wisper bikes or do I have to pay for a full throttle.