Something is going on, I have had new lawm mowers and a snow thrower develop flooding problems in a year. With my searching online I have seen other classic tractors owners complain about sticking needle valves that they have to change often, so I am not the only one with this problem.
In the classic car scene they do offer viton carburetor parts to replace rubber carburetor parts. They even warn to avoid older rebuild kits that still have rubber instead of viton. My Chevy with a 4bbl 305 runs on the same gas and thankfully doesn't suffer this sticking or leaking problems but is has good viton replacement parts in the carb. I have seen pictures of brand new accelerator melting in a hour in a glass of E10.
Again looking around online, it seems no one lists needle valves for Zenith carburetors as having viton tips like they do with Marvel carbs. For Marvel carburetors they do list needle valves for them as having viton tips. This has me thinking that new Zenith needle valves are just rubber tipped and not viton, viton usually has a blue tint that I don't see on Zenith needle valves.
I can't believe that carb cleaner ruined a needle valve either, maybe because it was already damaged by the gas? It was regular old Gumout which never did anything like this before. It should not have happened but it did, this indicates that the part must be low quality, US made or not. Maybe it's just a bad batch of Zenith needle valves floating around in the market, who knows. What I do is is that there is one tiny but critical part that is just not holding up and that I am having a hard time finding a quality replacement.
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