hex0rz
+1y
First off, I would like to know what the heck you are doing installing another used engine? lol..
Secondly, the throttle linkage should be installed, which is from the manufacturer.
The plates of which you are talking about are your butterflies. These are controlled by your choke. From what I can see, it appears it is electric.
The actual plates that you would want to worry about opening is your throttle plates. They are the plates at the bottom of the carb.
The spring and 2-holed oblong tab is for more throttle spring tension. Although, Even with mine installed it still does'nt take much pressure at all to over-rev her...
Go buy a bolt (Don't remember what size) from the hardware store and install the tab on your intake by the carb. There should be two tapped holes. Install the spring and then install it onto the throttle linkage via a small pinhole where the throttle cable goes.