This a clever system for the less physical and environementally friendly of us. Installing a two strokes engine now involve just changing a front wheel and swapping for water bottle for a gasoline filled one. It is said that it's less loud that it look, weight 12 pounds, add 1Hp and makes about 200 mpg. Althought I admire the design, 2 strokes engines no burned gases pollute so much that I would never recommend such device. Why not heading for an electric one?
photo: manufacurer website https://www.revopower.com/