[Jim/GA]

I have had great performance from the viton tipped valves in the past. I suspect the gasket(s) used to install the valve in the carb are not sealing properly. Try adding a light coating of a non-hardening sealant (like Permatex #2 or Hylomar AF) to the gasket(s) and reinstall.

Re-check the float level when you do. The lubrication of the sealant will allow you to tighten the valve more, resulting in a higher float level than you had before. It does not hurt anything to set the dry float a tiny bit over 1 inch; better than a bit under 1 inch.

Feel free to contact me with any questions (email below).

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