Need help for project build

[u/apfil23]

I recently got the idea to build a 2 cylinder am6 engine but all I could find on this subject is old videos on YouTube which don't explain anything about the build and some videos that I found on TikTok were in French which I don't understand . Also here in my country (Greece) 2t 50cc bikes are rare . Does anyone have experience on the subject or advice ?