Specifications

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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.