Originally Posted by Weld Engineer
Working on the carburetor. I found a new set of pumps for it from Gary Biewer mine are worn. Any suggestions on new springs? Pretty corroded and I’d like to replace them on the new pumps. Also a question concerning the two brass “flutes” with the needle valves in them. The fuel one is solid at the end and the water one has split is it supposed to be like that or did it open up an I needed to repair it? It looks like they were slit then brazed/welded back together. I intend to have the carb and fuel system working like original.
The needle seats have a slot cut in them where it goes into the venturi (top of the carb). The slot should be positioned so it is horizontal when fully tightened. The fuel then goes out both sides of the slot and drops down. The end of the slot is soldered.
As for the springs, any spring will do as long as it can return the pump to the up position.
There are small holes/ galleries where the fuel feeds up from the pumping chambers to the needle seats, make sure to clean these out thoroughly.
Make sure the butterfly shaft is not worn and replace the bushings. File the new bushings once they are installed to follow the bore of the carb.