While replacing my carb[1] I decided to try and model part of it! This is the cap on the old one. I even measured it with calipers and got pretty close in Blender though I had some camera issues so this is just preview window rendered.
[1] its a TaoTao Powermax 150, GY6-style 150cc scooter
@noroth-t indeed. At the time I didn't know how to adjust the camera clipping and this is modelled at mm scale so this is just a screenshot of the preview window. I know how to do it correctly now and am in the process of re-modeling this and all the other parts to the carburetor