Wow! Rub eyes. This is a 5 year old posting. Timotheus, did you call Jon at the above number? We try to help people and answers their questions but we depend on getting feedback (responses) in return.
"Fuel valve orifice" are words that can also be called needle valve. This part has a connection to the float which controls the level of fuel in the bowl.
The metering rod goes inside the metering rod jet. The rod and the jet are stamped with numbers.
Let us know if you need the information/training booklet that Carter Carburetor published for the YF model.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
