flooding back cylinder
The bike ran perfectly last fall. When I got it out for the winter, reinstalled the tank, put a new diaphragm in the fuel tank valve (as I always do: the ethanol ruins it annually). I tried to start it, it runs for about 30 sec. on the front cylinder while the back cylinder floods: after several seconds begins dripping raw fuel out the first exhaust pipe joint. When I pull the plugs, the back ones are soaked.
Do I need to pull the carb and take it apart? My research has shown me that it is probably either a stuck float (likely) or a bad jet (unlikely: I don't know how a worn jet would cause this level of flooding, especially after running perfectly last fall).
I can't do anything (e.g. carb cleaner in the fuel) that requires the bike to run, because it doesn't run.