FYI - Azusa still makes Mark-V Vari Hub

[Jeff Campbell]

... and they on used on many vintage karts and fun karts due to very low cost ($14-18 most dealers). There are older versions of this hub that are harder to come by, mostly cosmetically different. Why am I mentioning this, maybe I am missing something, but isn't that the same one Azusa is making today?

[Rob Voska]

That's the one!

[david a luciani]

maybe the forth hole makes it special!!!
i think the new hubs have only three holes but otherwise are the same.
at these prices i have four or five old ones that i'll sell for 50$ each.but alas, they're used, maybe N.O.S. makes the difference???
dave

[Dean Seavers]

The main difference between the vintage ones and the current ones is that the vintage ones are actually somewhat round and run kind of true.

[Rob Voska]

Clamp them on a piece of 1" round stock and take a light cut off them in a lathe.

[Jeff Campbell]

Looks like the current version to me. The much older versions of this hub had round holes where the large openings are now (those openings were closed over with a hole in the middle). I think the original one dates back to around 1960.

Here is Azusa stuff at APS, hub is AZ-1872 (the Azusa part number):
http://www.apskarting.com/pdfs/190-202.pdf

and at APPOCO for the same price of $13.69
http://www.appcokarting.com/sprocket.pdf

[Jeff Campbell]

Now here is another version of the hub, is this an earlier version or the current production version? Instead of 2 adjacent pairs of holes, it has just one large one (4 total).

[Scott Kneisel]

I bought one from Azuza a few months ago and it looks just like the first eBay photo. Man did that person pay too much.

Thanks for the tip on truing it, I just assumed it was round and have not tightened it down on the axle as yet. I will check that out before It goes on permanently and true it up on the lathe if necessary.

[Rob Voska]

ALso pay attention when you tighten the bolts. That can make it run off also.

[Jeff Campbell]

...found this... one on far left is the earliest version I believe, it has the round holes. It is the one that came on my barn fresh 1961 Fox Go-Boy.