The entire line of BME engines is being upgraded, P-51. How far this takes the 61cc twin is a matter of degree. It's already a fantastic little engine, and there is really not very much in it's size range that can compare to it, except for "thumper" singles that are no more powerful and vibrate 10 times as badly, as well as weighing nearly as much I'd expect it to achieve lighter weight as the crankcases from BME evolve from the many upgrades associated with the Xtreme-110 and 95cc "Echo" based twins.

For the most pertinent information, it would be best to contact Keith at BME. . the number is 254-836-0835