FUEL SYSTEM/CARBURETION
3.3
SPECIAL TOOLS
PART NUMBER TOOL
DESCRIPTION
2870975 Mity Vact
Pressure Test Tool
2872314 Carburetor Float
Adjustment Tool
WARNING
Gasoline is extremely flammable and explosive under
certain conditions.
Always stop the engine and refuel
outdoors or in a well ventilated area.
Do not overfill the tank. The tank is at
full capacity when the fuel reaches the
bottom of the filler neck. Leave room
for expansion of fuel.
Never start the engine or let it run in an
enclosed area. Gasoline powered engine
exhaust fumes are poisonous and can
cause loss of consciousness and death in
a short time.
Never drain the float bowl when the engine
is hot. Severe burns may result.
Do not smoke or allow open flames or
sparks in or near the area where refueling
is performed or where gasoline is stored.
If you get gasoline in your eyes or if you
should swallow gasoline, seek medical
attention immediately.
If you spill gasolineon your skin or clothing,
immediately wash with soap and water and
change clothing.
JETTING GUIDELINES
Changes in altitude and temperatureaffect airdensity,
which is essentially the amount of oxygenavailablefor
combustion. In low elevations and cold temperatures,
the air is more dense and has more oxygen. In higher
elevations and higher temperatures, the air is less
dense with reduced oxygen.
Polaris Youth Carburetors are calibrated for an altitude
of 0-6000 ft. (0-1800 meters) and ambient temperatures
between +40 and +80° F(+5° to +26° C).
Carburetors must be re-calibrated if operated outside
this temperature and/or altitude range. The jetting
installed in production is not intended for all altitudes
and/or temperatures. In addition, air screw / pilot
screw adjustments and CVT adjustments may be
required to suit operating conditions.
CARBURETOR SYSTEM
FUNCTION
Carburetor Component Function
System Main
Components
Main
Function
Main
Affect
Float
System
(Level Control)
Inlet Pipe,
Needle and
Seat, Float,
Float Pin
Maintains
specified
fuel level in
float cham-
ber (carbu-
retor float
bowl)
All systems
All throttle
ranges
Venting Passages in
Carburetor,
Vent lines
to frame
Supplies
atmospheric
pressure to
float cham-
ber
All systems
All throttle
ranges
Auto By-
Starter
(Choke/En-
richment)
Thermal Ex-
pansion unit
Plunger, Re-
turn Spring,
Carb Pas-
sages)
Supplies
additional
fuel air mix-
ture neces-
sary for cold
starting
Greatest ef-
fect at low
throttle set-
tings and
idle
Pilot (Idle
System)
Pilot Jet-
Passage-
ways, By-
pass Ports
(Under
Throttle
Slide), Pilot
Jet, Pilot
Outlets,
Throttle
Slide
Primarily
supplies fuel
at idle and
low throttle
positions
Mainly idle
to 1/4
throttle
Minimal ef-
fect after 1/2
throttle
Main Sys-
tem
Main Jet,
Main Air
Passage,
Needle Jet,
Jet Needle,
Throttle
Slide
Supplies
fuel at mid-
range and
high throttle
settings.
1/4tofull
throttle
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