This one does indeed refer to a 1" live axle.........
Engine Mount with Bearing Hangers| AZ8155 | BMI Karts And Parts.........
.........and this one has 1" bearings for a live axle.........
Azusa Swing Mount Kit Complete Assembly | AZ1879 | AZ1879 | BMI Karts And Parts........
.........but nowhere does either one say that you can
NOT put 3/4" or 5/8" flangette bearings in them for a jackshaft.
I could do anything I want with them, since like most real hotrodders I don't believe that I'm ever just stuck with having to use what manufacturers say is the only purpose of any parts in the way they say you're "supposed to". I can see me installing that mount as a full-footed, very stable, long-swivel gas pedal to please my sore knee and hip.
BTW, Russ, Denny has pretty much the same experience longevity as you do. I could too, if I'd played with little things like karts and tiny engines very much between being a teenager and when I retired. For myself, the volume of information I've picked up from Denny and so many other really well-experienced folks here over the last 3 years has caught me up on most anything gokart that I missed out on by working all the time with dirt bikes for fun, and big industrial/commercial locomotion stuff for a career in HVACR.
Pearl, note this about using the motor mount for indeed mounting a motor on it, and using the flangette mounts for a live axle or for a jackshaft...........If you build a rigid kart it wouldn't matter, but with rear suspension like a swingarm, you have to consider how much jouncing up and down you want your engine to do.
Using the mount for a live axle would have your engine sitting on the maximum amount of hard up/down travel there is in the rear end. Using it for a jackshaft, the further forward of the rear axle that it sits, the less wild jouncing up and down the engine will have to experience. I don't like a pogo engine at all, so I built with a rigid-mounted engine on a rack, see construction pic below.
