sometimes the actual bubble can pop off
bubble? eh?
i've had the metering head out n cleaned it up n stuff n it dont stick (it did before) so i think i'll be ok there

the WUR vac feed is good

i dont THINK i've got a gasket on the head/airbox seal either... i better look at that later just incase... but then i wouldnt have thought that's make the engine misbehave (as if it is leaking its BEFORE the metering head so shouldnt matter.. yeah?
that fookin bypass valv thing i never even thought of checking... so fookin obvious now you mention it
if i temporarily remove it (ie just block up the holes) i presume it wont break nothing... just overfuel like a mofo on overrun.. yeah?