here is a smal look how i let move an old polistil BMW R75 motorbike. Rals said it´s 1:15...that comes true, a bit big, but ok.
I use cheap thing´s that is run´s, and also not runs fast, but it drives

I use an 360degree servo for driving and an smal one for steering. No controler, just the receiver.
Thats the one:
Servo for driving:
Accu (from the Kettengrad) and receiver are in the "Beiwagen":
Servo for steering:
And a cover with woodglue and "tempo":
The driver is an 21.st man, but cut into pieces:
Some color and stuff:
The driver turn a bit on the seat when steering and is fixt a bit with one hand on the handlebar with an thread.
And a smal video how it drives:
https://www.youtube.com/watch?v=mdSf7r3K0tE
Was a simpel thing, but look cool when ist running

I will make e new video when we next on our playground.
Greetz, Andy