The type of two-stroke engine that uses a spinning plate with a hole in it to control the flow of fuel to the?

The type of two-stroke engine that uses a spinning plate with a hole in it to control the flow of fuel to the?
there are a few types of 2-cycle PISTON PORT engines that can have a resrictor plate installed behind the carb to restrict the fuel flow,So you need to be a lil more specific on what type of engine.