Here is a picture of three Carter YF carbs I have: Carter YF 2100S, YF 2100S, and YF 938SD . The one pictured on the right is the 938SD and it has a tube above the choke plate/valve. It was rebuilt in '96 by someone who would put a 'certified rebuilt' tracking number sticker on one.

The two carbs on the left are YF 2100S models that I am cleaning to use on a 55.2 235(single carb application; I recently found a spare carb). They do not have the tube above the choke plate/valve.

Am I missing this tube on both of my YF 2100s? Or is this their design? I noticed my Rochesters also have the tube.

Thanks
Brad


Last edited by ClaudeTheTruck; 10/02/2014 9:44 PM. Reason: changed "part" to "this tube"
Wrench Fetcher, PhD