4.4
FUEL SYSTEM / CARBURETION
Special Tools
Jetting Guidelines
Changes in altitude and temperature affect air density, which is
essentially the amount of oxygen available for 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 ATV carburetors are calibrated for an altitude of 0–6000
ft. (0–1800 meters) and ambient temperatures above +40
o
F
(+26
o
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 may be required
to suit operating conditions.
Carburetor Jetting
IMPORTANT: The following guidelines must be
followed when establishing a main jet setting:
1. Select the lowest anticipated temperature at which the
machine will be operated.
2. Determine the lowest approximate altitude at which the
machine will be operated.
3. Select the correct main jet from the specifications chart in
Chapter 1.
Mikuni Jet Part Numbers
Main Jets Pilot Jets
Jet Number
Part Number Jet Number Part Number
130 3131537 25 3131538
132.5 3131536 27.5 3131539
135 3131535 30 3131540
137.5 3131534 32.5 3131541
140 3131522 35 3131542
142.5 3131523 37.5 3131543
145 3131524 40 3131544
147.5 3131525 42.5 3131545
152.5 3131526 47.5 3131546
155 3131527 50 3131547
157.5 3131528 52.5 3131548
160 3131529 55 3131549
162.5 3131530 57.5 3131550
165 3131531 60 3131551
167.5 3131532 65 3131552
170 3131533 70 3131553
PART NUMBER
TOOL
DESCRIPTION
2870975
Mity Vac
TM
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 gasoline on your skin or
clothing, immediately wash with soap and
water and change clothing.
CAUTION
A main jet that is too small will cause a lean
operating condition resulting in
serious engine damage.
Select the correct main jet carefully for
elevation and temperature according to the
charts in the specifications section or in the
Owner’s Manual for each particular model.
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