Posted by JDseller on September 16, 2012 at 08:30:56 from (208.126.196.144):
In Reply to: H card leaking posted by lavallj3 on September 16, 2012 at 06:27:38:
Did you put a new seat gasket under the needle valve seat? Also I have found many of the imported kits are just pure junk. I have not found many US many kits anymore either. Look down into the needle valve seat. I have seen the hole be off centered in some of them. Also look at how square the tangs on the carburetor are. Then check the ears on the float itself. Make sure it is pivoting freely on the pin but is not too loose. A loose fit on the pin can let it cock when the gas lifts it. Making it bind or not push on the needle square.
Something is either binding or not letting the needle valve seat. When you are banging on it you are making the needle seat. I have a little air pumpand gauge off of a blood pressure cuff. I have several hoses that will fit the different carburetors. I turn the carburetor upside down and pump up some air pressure. You would be surprised at the number of them that will not hold any pressure at all. I then spray some soapy water around the needle valve and seat. You then can see what is leaking.
I do not like the rubber tipped needle valves. They sound like a good thing but in practice I have found them to not seal repeatably at the same height. They can vary a little bit. That makes the fuel level a hit or miss thing. The solid steel needle valves will repeat much better. Also the rubber tipped one will stick small rust particles in the rubber and not seal either.
Just check what you are doing very carefully. Something is not working correctly. I have taken them apart so many time I would swear I was going to wear the screws out.
Another thing I do on all the paper gaskets in a carburetor. I have a small pan of 30 weight motor oil. I soak them in the oil and then massage it in before I install them. It soften the caskets and makes them last longer. Plus you can get the carburetor back apart with out tearing the casket down the road.
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