Re: Zenith carb rebuild
The valve on the left is the original style, the one on the right is a newer style with a Viton (think synthetic) tip rather than metal and is supposed to be better. In my opinion, the best one is the one that does not leak.
If the carb is clean and you can use compressed air and/or the paper clip method to test the passages, there is no need to drill the plugs.
The key to a good rebuild is testing the jets and getting them re-jetted if necessary to flow the correct amount of fuel. Any rebuild that does not include flow-testing is at best just a good cleaning.
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Jim Adams
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