Is it better to rebuild or replace a carburetor or throttle
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 the installation.
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.
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