I would think that the mere existence of a "backyard" converted 2T street motorcycle would be sufficient validation of EFI, a transitory step to DI. The fact that a private individual has taken upon themselves the time, expense and effort to convert a two cycle motorcycle to a more modern system of fuel delivery would indicate to me that the acknowledgement of the need to keep the 2T instep with current technologies is more wide spread then I would have thought.
The achilles heel of the modern 4T is it's complexity (cost),physical size and weight, power generation per unit time and parasitic power losses (camshafts, oil control rings,oil pumps etc.). A DI 2T can match or exceed a 4T$'s fuel efficiency without any of any of these limitations (save perhaps the DI itself). DI 2T snowmobiles are already displacing the recently arrived 4T sleds, so it can happen commercially on a large scale.
