The Stovebolt Site Forums The Shop Area Engine Shop Rochester B Runs Only When Choked

I have a rochester B on a 235 engine and only runs when choked. It seems to run ok when choked but I assume somewhere it is getting to much air. Any ideas on how to correct this problem or figure out what causes it.

Sounds like the main jet circuit is plugged somehow. Take the carb apart and blow brakeclean thru all the passages then blow it out with air.

Aren't the rochesters notorious for warpage too? I'm just repeating what I read, but the logic made sense when I read it. Something to do with the number of screws on the housing vs a Carter w-1... I just sent my Rochester off to
Be rebuilt. It's always run pretty good I thought, but I've never had anything else.

Good luck, I'm sure the experts here will figure it out for you. Amazing wealth of knowledge here.

Sounds like a vacuum leak to me. I would plug the wiper fitting. The hose going to the wiper motor is a common place for vacuum leaks. If that makes no difference, try spraying something like WD40 where the carb meets the manifold and were the manifold meets the head, If the exhaust smokes white, you have found a vacuum leak.

Do you have a fuel filter? If it is plugged it may also cause this.
Jason

you may have a clogged fuel line. I ended up putting in a new tank cause my lines kept cloggin with rust. did not even make it to the filter. was the pickup tube that clogged.