yeah ive researched it and its much more work than i thought it would be, way too much money to invest in a motorized bike! Id say Go with a reed valve+36 tooth sprocket+porting+Expansion chamber instead
The kind of performance you want needs a Franco Morini engine. Why waste time on all the complexity? If you wanna go fast, get a real two-stroke from a KTM or LEM 50.Then you can port it, pipe it, and fly!