YF problem

I'm having a little problem with my YF carb leaking a bit from underneath somewhere. It's either dripping from the lift-rod opening, or it's around the throttle shaft. I've checked the float level a couple times, lowered it a bit the second time; still see some leakage. I'm limited to bouncing around in the pasture for test drives, but still, I'd rather not see raw gas outside the carb at any time! (Don't know if I'd see this prob on the road or not, yet) If it's around the throttle shaft, how do I go about bushing the shaft? I'm not real interested in going to a Solex right now. Everything else seems to be working great; starts easy, revs well, pulls hard, idles...... just leaks a bit. Arrrrgh. Any help?

 

OK, well.... rebuilt, but generic kit didn't have exactly the same setup on the needle valve. Put old one back; has a barely perceptible ring in the viton. (just barely see it) You may be right on, leaking by. No expert here; would I see other problems if overflowing due to valve leakage? I thought I was flooding the first time I saw it, but everything seems to work otherwise....

 

I haven't seen it do it until after I get back in the shop after bouncing around in the pasture. I'm thinking you're quite right about the needle - seat issue; guess I better look for a better carb kit? Throttle shaft idea was suggested to me by the fella who rebuilt the thing. From what I'm seeing this morning, I suspect I need to check better on your idea. On the other hand, is there supposed to be a "gasket" or seal of sorts at the top of the lift rod opening; maybe he, uh, neglected that???? Bouncing around the way I am would certainly slosh some fuel where it hadn't oughta be..... even if the needle - seat - float level issues are all ok.... Wish I had a thinking cap, that would help!!! Gotta go to work soon, if I ain't here, I'm there.... Thanks for the help, Glenn, really appreciate some wisdom!

Stu

 

What I do in needle seat checks is put a vacuum on the inlet (mighty vac hand pump) with the carb upside down, it has been the best check for a bad seat I have found. If it holds a vacuum it will hold pressure. I always check my carb rebuilds that way, in multi carb outboards if you miss one it's a lot of labor if you miss one.
Joe