87 honda civic horn and transmission questions

Hi, I was hoping someone could shed some light on the questions i
have. First I have an 1987 Honda civic with a manual transmission.
Its a 5 speed manual, 1.5, 4 door.

First of all, the horn doesnt work, and I was wondering if there was a
fuse or something else that needs to be replaced/fixed?

Second, when driving and I go to shift, when I press the clutch in the
rpms climb slightly and then come down, instead of dropping
immediately. If the engine is cold its much more of a dramatic
increase in rpms. I took the car to a mechanic to have it looked at
(and forgot to mention the horn, I know...), and he said there was a
vacuum leak and he thought there might be some blockage in the
carburetor. So i was wondering what exactly this "vacuum test" is and
what it checks for, and secondly if there IS some blockage in the
carburetor could it be fixed by overhauling the carburetor, i.e.
taking it apart and cleaning it.

Any suggestions on where I could find carburetor kits for this model,
would also be appreciated. thanks a bunch.

 

The Honda dealer sells what's known as a top clean kit. This kit comes with
just about everything you'll need except for floats. It also comes with
instructions. Follow them and you shouldn't get too lost. One item of note
is that you shouldn't attempt to adjust the auxiliary barrel. It's adjusted
at the factory and is best left alone. In addition, overhauling one of
these carbs isn't rocket science (it's more of an art) but it can be
difficult depending on your level of experience.

However, I suspect that your unit may have some other problems, e.g., the
choke linkage could be hanging up. Try cleaning all of the external linkage
with some carb cleaner and make sure that the choke butterfly valve opens up
all of the way to the fully vertical position.

Eric