It was dripping from my buddy Gary's valkyrie when he got it... the previous owner had tried
to fix it

... don't try this at home... if you get a "cover set" (and a new screen wouldn't hurt)
from the dealer or HDL or someone, you'll probably be good to go... search "cover set" on the
tech board to get part numbers, and people talking about doing the rebuild, and there's rebuild
instructions in shoptalk...

You can see that Gary's real problem was the munged up diaphragm... by blocking the weep hole
with a ... whatever that thing is ... the previous owner was asking for hydrolock... the petcock
still leaked, but gas also flowed down the vacuum line to cylinder #6 and raw gas would come
shooting out of Gary's pipes when he cranked it.
-Mike