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The carburetor on your Cobra motorcycle is quite adjustable. Figure 49 shows
its range of adjustment and in particular what adjustable component affects what
range of operation (specifically throttle position).
FUEL SCREW ADJUSTMENT:
Adjust for throttle response
The air adjustment screw is located on the left side of the carburetor. It requires
the use of a small flat blade screw driver for adjustment. After adjusting for
proper throttle response, use the idle screw to adjust the desired idle speed.
NOTE:
If the air screw requires more than 3 turns out, replace the pilot jet for one that is
one size leaner (smaller number) then readjust the fuel screw.
IDLE ADJUSTMENT:
Adjust for desired idle speed
The idle speed screw is located on the right side of the carburetor. It is hidden
behind the exhaust stinger pipe and is barely reachable with a screwdriver. 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:
Adjust for clean full throttle acceleration
Jet your top end (main jet) based on the acceleration of your Cobra Motorcycle
on the longest straight at the track. Observe any of the lean or rich symptoms
(spark plug appearance and bike performance) listed above and change your
jetting accordingly.
PART THROTTLE
Adjust for desired acceleration
Using an area of the track that allows the rider to operate and mid throttle and
transition (accelerate, or 'roll on') from closed, or mostly closed throttle, to a
larger throttle opening.
Observe the rich and lean symptoms listed above.
Adjust the jet needle position by moving the clip from its current position (move
the clip higher on the needle to make the bike run leaner, or move the clip lower
on the needle to make the bike run richer) to one higher or lower.
46
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