This project is more for looks than riding. The pipe is something I hacked together. The motor is a converted mac 300 chainsaw. It runs good and pulls hard once the rpms are up. The fender is single mount. The frame is a $10 flea mkt find. I stretched it 8 inches.
In 1965 I bought serial #7 for 34 bucks of my paper route earnings. It was all original with raised motor mount and came with a west bend 5 port 580. The rear sprocket also doubled as a disc brake with 2 aluminum calipers squeezing the sprocket
I left it with my brother and he gave it away. So I reincarnated it into this. 5.5 horse tecumseh power sports motor cvt drive 12" turf tires dual disc brakes and as a special bonus 50 mph clocked on my phone..
Early minibikes used 2 stroke gokart motors. This is a replica of one I owned in 1965. They were fast and oh my..dangerous.. I went on to race go karts and ama flatrack. It was a different world back then.
One design item of note. The adaptor that attaches the disc to the hub has 1" engagement on the hub. I machined it with a almost press fit. There are 4 set screws which go into dimpled holes in the hub. Been doing this for years. No problems yet..
Disc brake install complete along with a home built hub assy. The original rear wheel was corroded beyond repair. This minibike is a trailblazer from 1970 or 71. There was no rear brake on the rear wheel. What did they use for a rear brake.. Now to find a motor for this minibike. A tecumseh h50...
This is how I install a bicycle disc brake on a older minibike. Machine a hub to attach the rotor to the wheel hub and build a bracket to hold the caliper. This bracket centers on the axle spacer so it requires no slots for adjustment. And lots of stopping power.