2.32
MAINTENANCE
© Copyright 2011 Polaris Sales Inc.
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
Tire Inspection
• Improper tire inflation may affect ATV
maneuverability.
• When replacing a tire always use original
equipment size and type.
• The use of non-standard size or type tires may
affect ATV handling.
Tire Tread Depth
Always replace tires when tread depth is worn to 1/8" (3
mm) or less.
Frame, Nuts, Bolts, Fasteners
Periodically inspect the torque of all fasteners in
accordance with the maintenance schedule. Check that all
cotter pins are in place. Refer to specific fastener torques
listed in each chapter.
CARBURETOR MAINTENANCE
Choke (Enricher) Adjustment (Non EFI)
If the choke knob does not stay out when pulled, adjust
the choke tension by tightening (clockwise) the jam nut
under the rubber boot between the choke knob and nut.
Firmly grasp the rubber boot and tighten until the choke
slides freely but stays out when pulled.
Pilot Screw
The pilot system supplies fuel during engine operation
with the throttle valve closed or slightly opened. The fuel/
air mixture is metered by pilot screw and discharged into
the main bore through the pilot outlet.
Operating an ATV with worn tires will increase the
possibility of the vehicle skidding easily with
possible loss of control.
Worn tires can cause an accident.
Always replace tires when the tread depth
measures 1/8” (.3 cm) or less.
The pilot screw is calibrated at the factory to meet
EPA / CARB regulations for air quality standards
and is sealed with a brass plug to prevent tamper
-
ing. Removal of the tamper proof plug is not permit-
ted. For service purposes, cleaning of the pilot
circuit can be done only by a certified repair shop to
ensure air quality standards are not exceeded.
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