<VV> The YH Fuel Problem...solved?

[GYoungwolf at aol.com]

I have been trying diligently over the years to solve the problem that many 
YH owners have with their carburetor leaking fuel out the throat at idle or 
after shutoff. The favorite solution has been to install a fuel pressure 
regulator (or a return line, or both, in earlier cars) and hope for the best. I have 
tried just about everything including inlet ball valves, float levels, venting 
the top back externally to the bowl, enlarging vents, etc., etc. Some things 
worked some of the times. But, while toying with a shaft sealing system similar 
to what many owners use on the Rochester carbs, I think I might have found 
the cause of the fuel problem, and think it is simply excess air. While, I'm not 
sure why yet, every carb (so far) that got the seal kit was "fixed." 
Additionally, and strangely, none of the shaft to throttlebody bore clearances were 
what I would call "excessive" and were in the .002"-.003" total runout range. (I 
tried new shafts without success). I did find, however, what I consider 
excessive air leakage in the area of the choke housing and cover. While some air 
gets through that area by design, I found leakage around the plastic covers, 
mainly due to rough castings and the poor clamping design. Cleaning up of the 
area where the metal shield fits and using larger clamps virtually eliminated 
unplanned leaks. While I'm not sure if sealing just one or both of the suspect 
areas did it, those of you with the puking fuel problem might want to try it. 
Feel free to drop me a line for more details and how to test your carb.
The Carbmeister
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