I've had a fantasy of putting a Puch on a bike.
It will happen if this engine ever takes a shit.
So far, a few thousand miles, some were very abusive mountain dirt road miles.
138cc 4T flat head
44mph all day- faster than almost any stock moped (3 and 4 speed Italian bikes not included)
Purpose built gusseted frame, heavy duty shit everywhere. This frame is begging for a big bad 2T.
But your Firmstrong looks good and clean. A nice example.