I'm glad you feel 50 is not relatively old. When I was 48 I was young. Then bad things happened. Since Christmas of 2006, I decided I was old, but if I was to show you a picture of me in 2007 and one today I have less gray hair now and I do not dye it. It is one of the few things chemo did that was nice and I am only 50.
I really loved those little bikes. Those engines were rock solid and we beat the tar out of them. I remember honda did a similar 3 speed automatic on a 350. Could you imagine if we could get our hands on one of those 50cc engines for a bicycle now. Think of your shift kit and 21 speeds, LOL.
Clueless vendor. The 3 speed is the three speed finger shifter that is used as a clutch. The 3 speed shifter is integrated with the brake lever and is a great option for centrifigal clutch engine owners. Not a good idea for a non-auto clutch engine because it takes too long to ratchet the finger shifter 3 clicks to disengage clutch.