This weekend on Peerless Leader I set up the chain drives and disk brake. I already realize that in order to more quickly pull the axle, I'll have to grind off the caliper mount. I'll have to make that a bolt-in piece eventually. Routing the pedal drive chain around the engine was a bit of a pain and took all Saturday. Once I could crank the rear wheels with the pedals I was able to see how badly the rear wheels wobbled - about 3/8" side to side. Since my first attempt at bushings was a bit on the shaky side, the first thing this morning I made up another, more precise, set of bushings for the rear wheels.
For other builds I have so far bought three Heavy Duty Rear Wheel kits with the reverse threading for the left-side freewheel. You know the ones that come with the wimpiest band brake this side of Saigon. I even relined the bands on these things with a good metallic brake lining from McMaster Carr and the increase in braking performance was perceptible, but still marginal overall. Anyway, I still have two of these monsters in working order so I removed the freewheels, brakes, bearings and axles and ended up with a nice pair of wheels with 12 ga. spokes, aluminum rims, and 26mm bores. So the first part of the morning was spent again machining bushings to downsize 26mm to .750". That done, the rear wheels spin up with almost no wobble.
Then - because I want things to stop when I pull the brake lever - a go-kart disk brake. I know, the disk will only stop the left-side wheel. But the 3-speed jackshaft has a coaster brake. And the two together will leave some awesome skid marks!