Re: Newbie intro with some bike frame inquiries
Here is a Harley Hummer from the 1960s that has been converted to Briggs Vanguard power. (They came with 2 stroke motors with 125 to 175 cc engines, depending on the year). It may be easier to build your project from a vintage motorcycle platform, rather than modifying a bicycle frame.
“You're only young once, but you can be immature as long as you like" -Unknown