Carburetor Questions?

How much slop is to much in the throttle shaft?

 

Base line set up. Idle, mixture settings etc.

 

How to win the gold medal in the carb throwing contest?

 

Not specifically about a carb, but you might want to emphasize the importance of correct timing and engine condition before attempting to make carb adjustments.

 

Well, these questions don't come up unless there's something wrong, so I'd outline the talk around that - a systematic approach always helps.

You'd think about the carb if you have either a) a sudden no-start/no-run condition, or b) the engine runs lousy; black smoke, rough idle, no power, hesitation, lousy mileage, others?

No-start is the usual - gas or spark. You can assume you have spark, then talk about how the carb can go south suddenly, things like clogs, stuck float, bad fuel pump, OOG, others? I'm sure you can think of possible responses to all of these.

Worn out or dirty or broken or misadjusted has another group of problems, that don't neccessarily stop you altogether. Here's where the throttle shaft comes in, and rebuilding or replacement. Since it's about flatties, you might mention the Solex as a possible fix. Those more familiar with the YF might have some suggestions here. On the intermediates board, we went through a couple of threads on the presence or absence of the YF accel pump lifter link seal - IIRC only the kit from The Carburetor SHop has it, and without it you'll get more or less of a leak depending on float level.

hth!

 

Here's one to consider,I KNOW I TIGHTENED IT! (not shouting just stressing) A week after rebuilding my YF carb the float valve needle seat backed off enough to lower the float level and cause the engine to stall under load but would rev and idle fine. I had to get towed home and was particularly frustrating. Just thought I'd pass that along.

 

Here is a good question. How do you adjust the float? Get the float drop / shut off numbers from the rebuild sheet. Adjust the shut off and then adjust the drop independently of the shut off. Otherwise do not bend the float asm and throw the shut off out of adjustment. Only bend the drop tab to limit the drop. I rebuilt a rochester 2g today and had to remember how to adjust the float. It has been a few years since working on one. I used to have a 1971 gmc with the same carb style.