|
|
|
Fox Carburetor Indentification and Help
If Duke Fox's engines can be
considered unique, his carburetors are, perhaps, even more so.
We receive quite a few questions regarding carburetor operation
but with so many models, spanning many decades, it sometimes
takes several emails to determine exactly which one we are dealing
with. We have assembled a photo collection that covers most Fox
carburetors dating back several decades. Hopefully, these will
serve as a guide to help identify the carburetor on your Fox
engine.
For more information on carburetor
operating theory, adjustment procedures and modifications, just
click on the heading or more info for the carb series you are
interested in. |
Early
2-Jet Carburetors
|
While other manufacturers were still
offering only simple air-bleed types, Fox was producing more
complex fuel metered carburetors. These 2-jet designs were capable
of good performance, but were also quite tricky to adjust properly.
Don't confuse these with modern 2 "needle" carburetors
which are quite different in design and operation!
more info |
|
|
|
For .15BB |
For .19 - .25 |
|
 |
|
For .29-.36 size
engines |
For .40-.78 size
engines |
| MKX
Series Carburetors
|
These second generation Fox carburetors
operate on the same principle as most modern 2-needle types.
Although the concept did not originate with Fox, they are still
very much "Fox" in appearance.
more info |
 |
 |
|
For .15BB |
For .19 - .25 Bushing |
|
 |
For .40 small frame
engines.
.19BB and .25BB similar but
have
round intake instead of square. |
For .40-.78 size
engines. |
EZ
Series Carburetors
|
The EZ series replaced the MKX on
engines .40 and larger. Although outwardly these appear to be
just a simple air-bleed design, they are actually more sophisticated.
They also employ a fuel metering system for the midrange as well.
The air bleed-screw is provided to fine tune the idle mixture.
more
info |
 |
 |
|
For .40 size engines. |
For .45-.74 size
engines. |
"Improved"
2-Needle Carburetors
|
Although the EZ series is simple
to adjust, there have been some mid-range problems because the
metering system is not adjustable. Also, the air-bleed design
does not always work well in conjunction with external fuel pumps.
To solve these problems, Fox has recently introduced a new 2-needle
design. While the outward appearance is similar to the previous
MKX series, big improvements have been made to the fuel metering
system and needle valve assemblies. Our experience has shown
these to work extremely well! So far they are available only
for .40 size engines.
more info |
 |
Under development. |
|
For .40 size engines. |
For .45-.74
size engines. |
 |
Perry Carburetors
The Perry has long been the most
favored aftermarket carburetor. Although not a Fox product we are including it in this section
as it makes a great update to almost any Fox engine.
more info |
|