Sorry for slow reply. I have both of the springs which were used on that model of carburetor. I also have the choke cam with the cable piece & screw. Image below. Send me a PM or contact me at
[email protected] if you need them. They are not easy to locate today. I've attached another image showing how the spring connects to the cam on the back side of it. Note: if you need to replace the spring, you will need to remove the choke plate and the choke shaft. I also have the new screws and those are becoming harder to locate today. The lower spring can be replaced more easily.
By the way, Autoline's operation may have changed from the days when they were more highly regarded. When I was doing the Rochester study a year ago I wound up with one carburetor they had rebuilt in the last 6 or 7 years. It looked nice...clean and all. After I tried it and later disassembled it, the air horn was warped notably and their "fix" had been to use 2 gaskets. It didn't work (which was no surprise). Also, from what I learned, they now apparently use only a few numbers to identify all Rochester B and BC models: C-905 (auto choke-late version with center post for air cleaner), C-907 (manual choke) and C-906 (auto choke no center post for air cleaner). They do make them look nice, however. The one I had seeped gas constantly at the air horn/float bowl joint before I straightened it. It also ran horribly rich, but that was because the power piston was stuck. I don't blame Autoline for the power piston problem, however. It was as I said 6 or so years old when I got it. The float had not been set correctly however and that is just oversight or sloppy work.
