Polaris Virage TX 2000 Service Manual page 84

FUEL SYSTEM/CARBURETION
Carburetor Adjustment and Service
Carburetor Mixture Screw Adjustment - Keihin
Carburetor mixture screws pre-adjusted at the factory and usually no adjustment is necessary. Exceptions would
be after cleaning or overhaul, or when minor adjustments are required for altitude. Refer to carburetor specifica
tions at the beginning of this section and perform the following adjustments.
1. Loosen large clamp at air intake silencer and remove.
2. Secure choke in its closed position using tape or a tie
to prevent debris from entering carburetors or
engine.
3. Remove air intake cover, (6) screws, air intake
screen, gasket, and (9) attaching bolts. Remove air
intake base from carburetors.
NOTE: Use care to ensure lock washers are kept with
bolts, and cover the carburetors to prevent debris from
entering.
Do not force the needle into the needle seat. If over-tight
ened, needle damage will occur, resulting in erratic carbu
retor performance. In the photo at right, a needle (shown
with limiter cap removed) is damaged and must be re
placed. Refer to carburetor specifications at the begin
ning of this section.
Damaged Mixture Needle (Bottom)
NOTE: Water testing the craft is extremely important. The high speed mixture cannot be accurately determined
in a test tank. If operated in a test tank, the wide open throttle settings needed to fine tune may damage the
silicone sealant in the pump area.
The main jet controls fuel mixture between 3/8 and wide open throttle. Test in an area where you can safely and
legally operate the craft at full throttle for 10-15 seconds to obtain a spark plug color reading. Remove each spark
plug and observe color of spark plug insulator - it should be medium to dark brown.
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