Stumbled across this the other night, from a Stihl blower, 130cc inline twin conversion! Listen to the sound of this beauty. The wood its attached to isnt bad either
Video is 2 months old so conversions are still happening. I know if I can find another 4 mix to convert, I will!
This Sean (Youtube} guy has it figured out

130cc twin in a 1/3 dvii
Another video of it being tested,