Polaris 120 Indy Owner's Manual page 57

Maintenance
Carburetor
NOTICE: Making non-recommended adjustments could result in vehicle or
engine damage as well as denial of warranty claims. We recommend
that all carburetor adjustments be performed by your POLARIS
dealer.
Proper carburetor adjustment is critical, since a mixture too lean (too
much air, too little fuel) will result in overheating of the combustion
chamber, causing pre-ignition of the fuel. This results in piston burning,
bearing failure or complete engine failure. A lean mixture can be the
result of fuel line restrictions or foreign matter in the carburetor. A
mixture too rich (too much fuel, too little air) is also unfavorable
because it can foul plugs and cause generally poor engine performance.
All carburetors have been pre-set at the factory to the settings indicated
by the shaded cells of the jetting chart on page 81. Higher altitude
operation may require different adjustment and settings.
TIP: The number stamped in the end of the main jet indicates the jet size that
was installed at the time of manufacture.
NOTICE: Using non-recommended jets and/or needles can result in shorter
engine life, lower fuel economy, increased emissions and poor
performance and drivability. Always use POLARIS-recommended jets
and needles.
For questions about optional jetting for conditions in your area, see your
POLARIS dealer.
Correct setup provides engine RPM within its given power band at full
throttle settings and also provides maximum efficiency and operation at
all other throttle openings. See your dealer for carburetor adjustments,
which may include the following:
• Carburetor component changes for specific altitude and ambient
temperatures
• Choke adjustment
• Idle RPM adjustments
• Throttle safety switch inspections and service
• Throttle block-to-throttle flipper clearance adjustment
ADULT SECTION
55