HS carbs, I assume. With only two screws you might get a bit of fuel
seeping from the unsecured 'corner' going over bumps or round sharp corners,
but fuel-resistant sealant either side of the gasket might resolve that.
Don't over-tighten the remaining screws or you are likely to bow the lid and
make things worse, which could alter the angle of the float. If planning on
trying to remove the screw remember that it is a steel screw in an alloy
casting, and almost certainly sheared because it was seized in the threads.
That makes drilling a tricky proposition unless you can clamp it in position
under a pillar drill and use a very small drill to start with.
As far as your over-revving when hot remember that when 'cold' the engine
will idle less fast than when 'hot' anyway, that is what the fast-idle is
for when warming up. Normally problems with idle revolve around it varying
when the engine is hot. Try pressing the butterflies closed by hand, and
check that the fast idle screws are clear of the cam. Compare the 'suck'
from each when over-revving and normal idling. If the carbs are the same as
each other both times then it's probably the linkages holding the
butterflies open, or a vacuum leak around the inlet manifold. If one carb
is sucking more (or less) between the two states then it's probably a carb
problem.
PaulH.
----- Original Message -----
> On starting to look at over-revving issues, I noticed that one of the
> float
> chambers has 2 screws in the lid. On removal, the reason becomes obvious:
> the remains of a screw stuck in the threads.
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