Here is a Walbro WT-499 carb. A basic diaphram pumper type.
This model of carb has the jets sized and the componets selected for use with Methenol racing fuels.
I chose this model because it's simple and it's the only kind I had laying around with the plugs out to help show how they work.
You'll notice that there's no Throttle swivel attached. The reason for this is..... because I took it off..