I recently had the carbs rebuilt for my 300F. Now it seems to be running very rich, fouling the plugs in less than 50 miles. Are the 300F jet sizes different from a New Yorker (with only one carb)? I am wondering if the guy who rebuilt the carbs has the wrong size jet. Thanks in advance for whatever help you can provide. McTaggart in Ohio. [Non-text portions of this message have been removed]