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redmodelt · 02-21-2018, 03:26 PM

Biggest issue with all most all the needle type seats is you cant take the needle out easily to inspect. If the point is not polished correctly there is no way to get them to seal. I know that was an issue with Model T valves for a while. Sometimes little bit of brass is still in the seat area from machining, if those are not removed, same thing. Other thing you could try is tapping the needle lightly to seat it.
You may or may not know; to adjust the float, you add shims under the needle valve not bend it.
Also, there were some main jets on the market back some time ago that were a little on the short side.
Do you have the gasket installed under the jets?

02-21-2018, 03:26 PM	#17
redmodelt Senior Member Join Date: May 2010 Location: Portland OR Posts: 6,347	Re: Leaking Zenith Carburetor Biggest issue with all most all the needle type seats is you cant take the needle out easily to inspect. If the point is not polished correctly there is no way to get them to seal. I know that was an issue with Model T valves for a while. Sometimes little bit of brass is still in the seat area from machining, if those are not removed, same thing. Other thing you could try is tapping the needle lightly to seat it. You may or may not know; to adjust the float, you add shims under the needle valve not bend it. Also, there were some main jets on the market back some time ago that were a little on the short side. Do you have the gasket installed under the jets? __________________ I know the voices aren't real but damn they have some good ideas!