Carb tuning with a YF

[Eric Rose]

I finally got my car drivable. I got another YF housing from my uncle and was able to put together 2 carbs and make one. I have it running decent but there is a dead spot right off of idle where if I really step on it the car will want to stall. Other than that it seems to be running a little rich because I can smell gas in the exhaust.

I was able to drive it from Cartersville to Athens over this past weekend, and I have been driving it a few miles to work every day since.

I think the YF he gave me might have been from a 250. Would the jets be different between a 250 and a 200?

Any ideas about how I can start trying to take care of the dead spot? More/less timing, maybe? Vacuum leak?

 

[CZLN6]

Howdy Eric:

If the carb is a YF it was for a 200. 250s got a Carter RBS carb. It is quite different in appearance than a YF. But, yes, the jets would be different. They are/maybe different depending on vehicle application, location and year.

What you're describing sounds like a weak accelerator pump. Did you put in a fresh carb kit when you put this carb together? What distributor are you using with it? What do you currently have your initial advance set at? Have you set the low speed air screw with a vacuum guage?

Adios, David

 

[Eric Rose]

I haven't broken out a vac. gauge on it yet. I will have to go get one when I get paid Friday.

The carb was rebuilt with a fresh carb kit.I cleaned everything with purple power and blew out all passages with compressed air. I haven't tried adjusting the step-up pump, I'm not sure how you can adjust it. There is an adjustment for the metering needle that I haven't played with yet.

Using a Duraspark II distributor. I set the initial timing at 10 degrees but a set it with the vacuum advance hooked up. I will try setting it without the advance hooked up