Barettas have minarelli engines, put a polini kit, phbd carb, and an expansion chamber exhaust on there and you will go faster than that 110cc four stroke engine. And you won't have to butcher your bike and do a bunch of welding. A 110cc 4-stroke only produces about as much horsepower as a 55cc 2-stroke, having 4 gears is cool but it will just make it a motorcycle.