At lease on a 2007, you can take the tank off without removing the regular petcock, though you have to lift, pull back, and wiggle the tank to the left before it will clear the frame. Much easier to do with the Raptor installed, though. And now off is off and on is on, which my ancient brain finds more logical. I used a rubber nipple from Autozone to block the carb port.
I think it was 7/16th. Fit perfectly. [/quote]
7/16 is .437. I measured mine and the OD of the shaft is .220. So I believe the 7/16 will be way too big.