Polaris TX Starfire Owner's Manual page 74

CARBURETORS (Con't.)
(e) Find out and set the position once more where engine
rotation becomes maximum by opening or closing the air
screws one by one about 1/16 each time.
(f) If the number of rotations has changed in the adjustment
mentioned in paragraph (e), set once more at the normal
number of rotations of idling by means of each throttle stop
screw.
(g) Remove the plug cap of each cylinder and check whether
the down percentage in the number of rotations of the engine
is constant or not at that time. If not, return the throttle stop
screw on the side where the down percentage is larger and adjust
so as to make the down percentage constant.
(h) In the last step, operate for 5-10 minutes by idling. If
the rotations of the engine are normal during that time, the
adjustment is complete. If abnormal, remove the ignition plug
and check the condition of combustion. If the combustion
seems to be somewhat over, return the air screw, and if some-
what under, fasten the air screw.
ADJUSTMENT IN ACCORDANCE WITH THE ALTITUDE
AND THE TEMPERATURE
The density of the air varies according to the altitude and the
temperature. It is necessary that the delivery of the fuel in the
carburetor should be changed according to the change of the
density of the air.
INITIAL STARTING
For initial starting in cold weather, start the engine with the
choke full open. On this occasion, it is necessary to be careful
not to open the throttle valve. If you open the throttle valve,
the negative pressure working for the injection of the fuel for
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