The jet difference is because the front has a power valve that will add fuel at WOT through the power valve channel restrictions (PVCR). DO NOT go down that much. Where is it running rich? Go down on all 4 1 size at a time, and stop when you lose MPH. If it goes down right away, go back up, you want to jet for best MPH. Once you find optimum WOT metering, you can open up the PVCR's and jet the primary down if needed to lean part throttle. Demons also suffer from excessive emulsion, the best way to find out where you are is an O2 system.