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Fuel & Air System
Carburetor:
Tools recommended for carburetor service:
• Small flat head screwdriver
• WD-40
• 6mm socket
Your Cobra is equipped with an
adjustable carburetor. Some fine-
tuning may be needed according to
weather condition and altitude.
Proper jetting is very important for
engine performance and engine life.
Serious damage to the engine can
occur if not properly adjusted.
IDLE ADJUSTMENT:
On the each side of the carburetor,
there are two adjustment screws.
The right side screw with the
knurled head is the idle adjustment
screw. To raise the idle, turn the
screw in clockwise (in 1/4 turn
increments) and rev the engine
after each adjustment. To lower the
idle,
turn
the
screw
counter-
clockwise.
TOP END JETTING:
Indications
that
the
engine
is
running too rich (too much fuel for the air) are:
• Engine not revving out or blubbering at high RPMs.
• Engine will not 'clean out'
• Wet or black spark plug
NOTE: Before changing jetting be sure that the air filter is properly cleaned and
has the usual amount of air filter oil. An overly dirty air filter can cause the engine
to run rich.
If the engine is running rich on the top end it should be leaned out. Leaning it out
can be done by:
1. Changing the main jet to a smaller number.
2. Raising the needle clip (this lowers the jet needle) one notch at a time on the
slide.
Indications that the engine is running too lean are:
• Engine cutting out on top end.
• Engine overheating and ultimately seizure.
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