I've just finished cleaning my 426 carb after a year of sitting only to reinstall it and find fuel leaking out of the majority of packings due to drying out. The carb has a swivel fitting for the fuel inlet. I can't think of a single reason why on earth you would need a rotating fitting for your fuel line, unless your fuel tank is going to be constantly changing its position. Anyhow it has 3 o-rings on the rotating tube inside the carburetor. Yamaha doesn't sell these o-rings and the dealer told me I'd have to buy a new carb to get them because the microfiche doesn't show this as a replaceable part. I couldn't find any vitron seals of the correct size at several hardware stores and nitrol rings leak in fuel after a couple of days. I purchased a 90 degree fitting with 1/8 pipe thread and 1/4 barb on the other. The inlet in the carb is the perfect size to tap 1/8 NPT without re drilling. I wrapped several layers of Teflon tape to the threads and spun it in until it was snug and the fitting was facing toward the tank. No leaks and several hundred dollars saved. Just wanted to post this although I know most of you won't be interested, but maybe I can help a few of my fellow TT'ers out.