Interesting. Sure its not an electric choke actuator?

 

Or, maybe it just partially cuts fuel flow to lean out on shutoff?

 

It's a fuel cut solenoid.

Cool - any idea what carb that was? I want to get hold of a solenoid valve that I can rig up as an anti theft device.

I think you will find virtually any late 70's onwards Toyota carb will have one. Screws into the body and has two wires (sometimes one) coming off it.

 

If you have a look in a Toyota manual, they are identified as a fuel solenoid.

 

I have R, T and A series manuals and they all have them.

Done!