It's astounding what some of these old farts have experienced during a lifetime spent in the minibike/scooter era...and the information they are willing to share if approached in the right way.
I recently learned why some Cushman 8hp engines had a bolt through the intake manifold that wasn't meant to hold anything...a Cushman retiree told me that the scooter was shipped to a state that had a 6hp limit for licensing, and the bolt disrupted the manifold flow enough to drop the horsepower down low enough to pass inspection.
There was so much info regarding minibike and scooter manufacturing that was never documented, and every day a little bit more is lost to history.
That old guy in Portland would have been kickin' me out of his shop every weekend...I'd have pestered the hell out of him, asking a million questions.