That is what I will do, I think it is sound advice for sure. The axle and parts kit I showed you most recently was keyed, maybe you missed it? I will re-post those links, along with some other things I found on Amazon. What do you think of these? I decided to go with a centrifugal clutch for now. Maybe I will upgrade to a torque convertor one day. Most of my karting will be on roads, anyways. I think the wheels should be fine with the hubs, as far as I can tell. They are meant for a golf cart, so I think they should be fine at higher speeds. (I.E, 30ish mph.) WhiteTrashRocker uses turf tires, and these should be even better. And in the interest of safety, I have decided to settle for a lower top speed than what I was initially thinking.
axle-click here
axle parts-click here
wheel sprocket hub-click here
chain sprocket-click here
drive wheels-click here
centrifugal clutch-click here
BTW, I REALLY appreciate all your help and patience. Something has clicked, and all this stuff is just now starting to make sense. Thank you SO much.