Bruce;

Is there a front/back SU difference or am I mistaken?

Just looking to get my memory notes corrected.

E

Ill look into that Bruce and see what is going on. I need to figure out where this vacuum leak is coming from, a real high pitched whistle, I tried using a hose to my ear but havent isolated the area yet, almost sounds as if it is internal on the front carb. Another thing that bothered me after start up was I was getting a drip from my valve cover breather hose that attaches to the air cleaner. To me it felt and smelled like a thinned down mixture of oil/gas, not too sure if this is just remnants of the gas I got up in my oil before and its working its way out.

Is there a front/back SU difference or am I mistaken?

Round tops or flat tops?

On the round top carbs, the body casting used for the front carb is different externally than the rear one. The float bowl castings are different as well, front to back. Mirror image kinda thing. It would not be easy to swap round tops to the "incorrect" positions.

On the flat top carbs, they used the same basic body casting for front and rear and just dressed them up differently depending on what position they were intended to be used on. It would be relatively easy to swap the positions of the carbs by moving the linkage and the idle air control fittings.

Cant get them balanced correctly, Im running but running a little rough. Spark plugs are sooty black, and getting black smoke out the pipe. The whistling leak I was hearing I believe is a nozzle leaking. I can feel a little bit of gas on the shaft of it.

Bruce, guess that was the issue on the floats. The standoffs were different but the needles and seats were the same. Guess I should have a longer needle/seat to correspond with the longer standoff. As is right now the front bowls float is needed to tilt upwards a bit in order for me to get it to fill to the 23mm mark. But I did set both float bowls to the 23mm from the rim, if I understand it correctly I do not need to necessarily set it at the 23mm mark but I could lower it if need be as long as I set the nozzle level to match?

Ill probably order up nozzles and needles from your place and see what happens, too much going on right now to get the bells and whistle treatment. I have to read up a little more on which nozzles/needles I should get due to being at higher altitude, in Denver so 5200 feet on average.