I was thinking – in the case of China bikes (and probably not only with them), there are questions, and whether this particular detail will suit you. When buying on the Internet, sometimes even photos are not sensible, there is no need to talk about the size. During the search for a silencer, the question became especially acute. There are all sorts of galleries of 3D models, like the thingverse. I wish I had another one with details of different mechanisms. Not necessarily a moto, any.
I really don't think I'm a modeler. Openscad somehow mastered, that's all. I wonder if the sizes can be put here somehow?