The AI cars have stolen my nice new helmet design and I don't like it

Any way to force them to use the 'default' white helmet?

No you cannot. Although you can disallow the AI to use your setup and skin, they will still always use your helmet..

If it really matters you can choose the default helmet, then select all the AI you want and they'll be using it. Once they're on the grid you can re select your helmet or car skin, and they'll still be on default

not as if you can see your own helmets skin, whats the matter