8151 Manuals
SPECIAL TUNING SUPPLEMENT FOR
MAIN JET-EQUIPPED CARBURETORS
Unlike most of the Edelbrock Performer
Series Carburetors, the carburetor you have
purchased is equipped with a main jet for
fuel metering above 2/3 throttle opening.
The following chart will help determine
which type of adjustment needs too be
performed.
Off-idle throttle response-Accelerator Pump
Idle to 1/3 throttle-Needle height
1/3 to 2/3 throttle-Needle size
Figure 1
2/3 to wide open-Main Jet
NOTE: If you need more fuel a larger # main jet
For adjustments other than main jet, please
will be required. A smaller main jet will deliver
refer to the main tuning manual.
less fuel.
4. Install desired jet into pick up tube. Do not
over tighten jet as brass is soft and can easily
MAIN JET ADJUSTMENTS
strip.
5. Replace bowl plug with O-ring. Do not over
The main jet controls fuel flow from about
tighten plug when reinstalling as it is hollow
2/3 throttle to wide open. If you have a
and can easily crack or break. It is also
problem in this area of throttle opening a
recommended a small amount of grease be
main jet change is in order. The main jet is
applied to the O-ring before re-installation.
located in the bottom of the pick up tube
and can be accessed by removing the plug
MAIN JET SIZES AND PART NUMBERS
in the bottom of the float bowl.
.062 #8140
.076 #8147
.064 #8141
.078 #8148
1. Turn fuel petcock to off position.
.066 #8142
.080 #8149
2. Remove aluminum plug from bottom of
.068 #8143
.082 #8150
float bowl using 11/16 (or 18mm) socket
.070 #8144
.084 #8151
or wrench. NOTE: It may be advantages to
.072 #8145
.086 #8252
loosen both clamps and rotate top of carb
.074 #8146
.088 #8253
towards the right side of the bike to gain
access to the plug and jet. Use a small cup
NOTE: Refer to Model Supplement for standard
to drain fuel from bowl into while removing
main jet and alternate main jets supplied with
plug. WARNING!! Gasoline and gasoline
kit.
fumes are extremely flammable. It is
strongly recommended when working with
gasoline, it be done in a well-ventilated
area away from any open flames or ignition
source.
3. Using a stubby flat-blade screwdriver
remove main jet from pick up tube. See
figure 1.
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