Carburetor Jetting; Mikuni Jet Part Numbers; Jetting Guidelines - Polaris 2005 Sportsman MV7 Service Manual

SPECIAL TOOLS
PART NUMBER
2870975
2872314
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.

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 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
TOOL
altitudes and/or temperatures. In addition, air screw
DESCRIPTION
/ pilot screw adjustments and PVT adjustments may
be required to suit operating conditions.
Mity Vact
Pressure Test Tool

CARBURETOR JETTING

Carburetor Float
Adjustment Tool
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 Safety and Maintenance Manual for each
particular model.
IMPORTANT:
followed when establishing a main jet setting:
1. Select the lowest anticipated temperature at
2. Determine the lowest approximate altitude at
3. Select the correct main jet from the chart on Page
4. Clutching changes may also be required for

MIKUNI JET PART NUMBERS

Jet Number Part Number
112.5
115
117.5
120
122.5
125
127.5
130
132.5
135
137.5
140
142.5
145
147.5
150
152.5
155
157.5
160
162.5
165
167.5
170
FUEL SYSTEM / CARBURETION
CAUTION:
The following guidelines must be
which the machine will be operated.
which the machine will be operated.
1.4.
changes in elevation. Refer to clutching chart in
the specifications section for recommendations.
Main Jets
Jet Number Part Number
3130554
40.0
3130555
42.5
3130556
3130557
3130558
3130559
3130560
3130561
3130562
3130563
3130564
3130527
3130566
3130567
3130568
3130569
3130570
3130571
3130572
3131141
3131142
3131143
3131144
3131145
Pilot Jets
3130624
3130526
4.5