Is it better to rebuild or replace a carburetor
or throttle body?
If all the carburetor needs is cleaning and
adjusting, then a kit will usually do the trick. A kit is also an option
if the carburetor needs a gasket, diaphragm, needle valve, check valve,
or other component commonly included in a kit.
Floats, choke housings and choke pulloffs
are usually sold separately, but are relatively easy to replace if defective.
Faulty or misadjusted chokes and floats probably account for more carburetor
problems than anything else.
Most carburetors today have molded foam floats
rather than hollow brass floats. Some import carbs have hollow plastic
floats. If a hollow float develops a leak, it will fill with fuel and
sink, causing the carburetor to flood.
The solid foam variety can absorb fuel over
a period of time. That's why the float should always be weighed when
the carburetor is rebuilt. A heavy float will make the fuel mixture
rich. Replace heavy floats.
Kits are not for everyone. It takes a fair
amount of know-how to properly rebuild and adjust a carburetor. It also
takes a lot of time to disassemble, clean, inspect, and reassemble a
carburetor. Many professional installers, as well as do-it-yourselfers,
prefer to replace a troublesome carburetor rather than to try to rebuild
it with a kit.
There are some carburetor problems that cannot
be fixed by a kit or by replacing faulty components. Wear around throttle
shafts or warpage in the carburetor body or throttle plate can create
vacuum leaks that foul up fuel metering. The only option here is replacement.
Most rebuilt carburetors are sold on an exchange
basis, so it's important to make sure that the exchange carburetor is
complete (all external parts intact), has not been disassembled, and
is correct for the application.
If a base gasket is not included with the
replacement, be sure your customer gets one before he leaves. Your customer
may also need new fuel hose, fuel filter, and air filter to complete
Because there are many small components included
in a TBI kit, it is important to inspect each kit to verify that everything
is included. Installers must pay close attention to the kit when assembling
the unit to be sure small parts are placed in their respective positions.