Thinking about the "pros and cons" of a four stroke build...

Y'all have got me thinking now, and we all know that gets dangerous. argument

Gx 50 on this clutch housing bolted to a rear rack maybe welded on or bolted on and a 6 hole rear hub with a sprocket.

Should be a good setup, thinking about doing it with my gx50. My 2 stroke 43cc with a friction drive won't gain momentum for some reason maybe the clutch is already burnt or it won't reach max rpm one of the 2. It just won't propel the bike at all.