I have a 1939 Knucklehead and the left hand gas valve has leaked since I obtained the bike (about 1 year). The valve has a brass body and steel tapered plug which I believe to be a 3601-36. I am not sure if it is stock or aftermarket as I am not a knucklehead person. I lapped the plug to the body with 320 grit clover compound cut with light oil to thin it out (which was the finest grit I had), followed by AutoSol and then Brasso. When I examine both the body and the plug under a magnifier - both finishes look good but it still weeps at the front of the valve (the larger diameter). Does anyone have any ideas or methods for this type of issue.
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Thanks in advance for any help.