Re: reliability is a must!
Yes- a 36 or 34 sprock, and some not-too-fat tires- 1.95 or less- to get a good rolling cruise without the motor wide open-
I still tout the 415 Trike Industrial chain- for about $15 a 415 size with smaller plates plates vertically- lighter in weight and ROLLS so much better- you can really feel it peddaling and so will the motor
I've always had good luck with an NT speed carb on a short billet- when the motor is fairly level at least-
no fuss or muss.
and -yes- NO tensioner. No experience with CNS and I see there's a newer NT that looks simila to CNS- a choke lever might be nice.
I like to use sound dampeners, and with the cover off, you can put a little grease around the internal gear, which makes it roll better and more quiet- you can feel and hear the difference, but keep it from around the back and the clutch pads, or that will slip til it dries or removed.