The exploit I discovered does not go as fast with this full-sized wing, but at least this version can be assembled with just 4 vanilla devices, making it possibly viable for speedrunning purposes or early-game shenanigans.
This motorcycle uses a low center of gravity to keep upright, with the center of mass near the back so that it can climb better. You can bring the control stick, the mirror, the small wheel, and the light, but then you need to spend 18 zonaite to build the rest, 1 enlarged elevator rail, 2 enlarged big wheels, 1 depot u-block, and 2 different clipping objects that fall underground.
Note that if you are turning right you can turn very fast, but turning left is a much slower turn speed. With practice you can turn right enough to spin in place.
This vehicle can 1-shot any enemy that you can knock over, but it doesn't work on bosses. Turning the wheel to the right just before impact can increase the spin speed for more reliable one-shot kills.
Please enjoy, this one is fun to ride!
This is the third version of Jeff. I love Jeff.
This build uses 20 parts so there is room to attach one more object. I attached a big battery in this video footage just to get rid of the battery gauge from the screen.
This build uses a shrunken Juny cart for propulsion and 2 infinite wings. It also includes a stolen elevator.
The spring activates the Juny cart engine, so Jeff will keep going unless you toggle off the spring by mounting the stick again. This on-off toggle can be done mid-flight too.
The wings are extracted shrine seesaws, so they can pass through terrain, making this build durable enough to perform dive-bomb attacks. This is the most durable Jeff ever!
If you like using original parts to save the cost of zonaite, then you will need to gather 2 hooks found outside the first shrine, 2 shrine motors, 2 mine carts, 1 flame emitter, 2 big wheels, 1 yiga spike strip, 2 Gerudo capstan handles, 1 spring, and 1 steering stick.