Cobra CX50 2014 5R King, Owner'S Manual

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14. Reinstall the cover
NOTE: Refill the coolant system with 50/50 antifreeze-coolant / distilled water.
CAUTION:
Do not mix Propylene Glycol based coolant / antifreeze solutions with Ethylene Glycol
based coolant / antifreeze solutions.
Fuel & Air System
Carburetor:
Tools recommended for carburetor service:

Small flat head screwdriver

WD-40

8mm 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 left side of the carburetor, there are two adjustment screws. The larger 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.

White spark plug
CAUTION:
It is much safer to operate the engine slightly rich as opposed to slightly lean. This is
because an overly rich engine will just run poorly while an overly lean engine will seize,