You can see my modified stock axle I'm keeping as back up.
Also pictured are the set screws I added to the brake and sprocket hubs for the HD axle I bought. The hub's "fit" was way too loose for my liking. The hubs could rotate back and forth quite a bit. The locking collars they supplied prevents them from moving side to side, but the back and forth bothered me. You're applying all your engine's torque and the torque of the kart slowing down on a sloppy fit on very small splines.
IMO it wouldn't take long for them to slip and strip under heavy abuse. And I abuse this thing pretty good.
Also pictured is my Tractor Supply 36T sprocket. If you stand on your head, you can get the sku number if you're interested....
