Snowmobile Polaris Two Stroke (2007 year). Instruction - part 13

2.9

GENERAL

2

Measurement Conversion Chart

Piston Wash / Spark Plug Reading

Changing temperature, barometer, altitude, and fuel supply are
just a few of the factors that can affect the day to day
performance of your engine. That is why using Exhaust Gas
Temperatures (EGT) are important for maintaining optimum
performance. There are two methods for helping you determine
what the EGTs are for your machine. Piston wash and the
coloring of your spark plug.The piston wash is by far the most
valuable tool in concluding EGTs, with the spark plug color
running a distant second. Use the illustrations below to help you
establish the EGTs for your machine.

Once the proper jetting is established, you can reference the
EGT gauge for your baseline numbers. Then, if there is a rise or
fall of 25 degrees, you must jet accordingly to return your EGTs
to the baseline numbers.

U

NIT

 

OF

 M

EASURE

M

ULTIPLIED

 

BY

C

ONVERTS

 

TO

ft-lb

x 12

= in-lb

in-lb

x.0833

= ft-lb

ft-lb

x 1.356

= N-m

in-lb

x.0115

= kg-m

 N-m

x.7376

= ft-lb

kg-m

x 7.233

= ft-lb

kg-m

x 86.796

= in-lb

kg-m

x 10

= N-m

in

x 25.4

= mm

mm

x.03937

= in

in

x 2.54

= cm

mile

x 1.6

= km

km

x.6214

= mile

Ounces (oz)

x 28.35

= grams (g)

grams (g)

x.035

= Ounces (oz)

cc’s

x.03381

= Fluid Ounces (oz)

lbs

x.454

= kg

kg

x 2.2046

= lbs

Cubic Inches

x 16.387

= Cubic 

Centermeters

Cubic Centimeters

x.061

= Cubic Inches

Imperial pints

x.568

= liters (l)

liters (l)

x 1.76

= Imperial pints

Imperial quarts

x 1.137

= liters (l)

liters (l)

x.88

= Imperial quarts

Imperial quarts

x 1.201

= US quarts

US quarts

x.833

= Imperial quarts

US quarts

x.946

= liters

liters

x 1.057

= US quarts

US gallon

x 3.785

= liter

liter

x.264

= US gallon

Pounds force per 

square inch (psi)

x 6.895

= Kilo pascals (kPa)

Kilo pascals (kPa)

x.145

= Pounds force per 

square inch (psi)

2.10

GENERAL

Glossary Of Terms

ABDC: After bottom dead center.
ACV: Alternating current voltage.
Alternator: Electrical generator producing voltage
alternating current.
ATDC: After top dead center.
BBDC: Before bottom dead center.
BDC: Bottom dead center.
BTDC: Before top dead center.
CC: Cubic centimeters.
Center Distance: Distance between center of crankshaft
and center of driven clutch shaft.
Chain Pitch: Distance between chain link pins (No. 35 =
3/8" or 1 cm). Polaris measures chain length in number of
pitches.
CI: Cubic inches.
Clutch Buttons: Plastic bushings which aid rotation of the
movable sheave in the drive and driven clutch.
Clutch Offset: Drive and driven clutches are offset so that
drive belt will stay nearly straight as it moves along the
clutch face.
Clutch Weights: Three levers in the drive clutch which
relative to their weight, profile and engine RPM cause the
drive clutch to close and grip the drive belt.
Crankshaft Run-Out: Run-out or “bend” of crankshaft
measured with a dial indicator while crankshaft is
supported between centers on V blocks or resting in
crankcase. Measure at various points especially at PTO.
CVT: Continuously Variable Transmission (Drive Clutch
System)

DCV: Direct current voltage.
Dial Bore Gauge: A cylinder measuring instrument which
uses a dial indicator. Good for showing taper and out-of-
round in the cylinder bore.
Electrical Open: Open circuit. An electrical circuit which
isn't complete.
Electrical Short: Short circuit. An electrical circuit which
is completed before the current reaches the intended load.
(i.e. a bare wire touching the chassis).
End Seals: Rubber seals at each end of the crankshaft.
Engagement RPM: Engine RPM at which the drive clutch
engages to make contact with the drive belt.
ft.: Foot or feet.
ft-lb: (foot pounds) A force of one pound at the end of a
lever one foot in length, applied in a rotational direction.
g: Gram. Unit of weight in the metric system.
gal.: Gallon.
ID: Inside diameter.
in.: Inch/inches.
in-lb: (inch pounds) A force of one pound at the end of a
lever one foot in length, applied in a rotational direction. 12
in. lbs. = 1 ft. lb.
kg/cm

2

: Kilograms per square centimeter.

kg-m: Kilogram meters.
Kilogram/meter: A force of one kilogram at the end of a
lever one meter in length, applied in a rotational direction.
l or ltr: Liter.
lbs/in

2

: Pounds per square inch.

Left or Right Side: Always referred to based on normal
operating position of the driver.
m: Meter/meters.
Mag: Magneto.
Magnetic Induction: As a conductor (coil) is moved
through a magnetic field, a voltage will be generated in the
windings. Mechanical energy is converted to electrical
energy in the stator.
mi.: Mile/miles.
mm: Millimeter. Unit of length in the metric system. 1 mm
= approximately .040".
N-m: Newton meters.
OD: Outside diameter.
Ohm: The unit of electrical resistance opposing current
flow.
oz.: Ounce/ounces.
Piston Clearance: Total distance between piston and
cylinder wall.
psi.: Pounds per square inch.
PTO: Power take off.
qt.: Quart/quarts.
Regulator: Voltage regulator. Regulates battery charging
system output at approx. 14.5 DCV as engine RPM
increases.
Reservoir Tank: The fill tank in the liquid cooling system.
Resistance: In the mechanical sense, friction or load. In
the electrical sense, ohms, resulting in energy conversion
to heat.
RPM: Revolutions per minute.
Seized Piston: Galling of the sides of a piston. Usually
there is a transfer of aluminum from the piston onto the
cylinder wall.
Possible causes: 1) improper lubrication; 2) excessive
temperatures; 3) insufficient piston clearance; 4) stuck
piston rings.
Stator Plate: The plate mounted under the flywheel
supporting the battery charging coils.
TDC: Top dead center. Piston's most outward travel from
crankshaft.
Volt: The unit of measure for electrical pressure of
electromotive force. Measured by a voltmeter in parallel
with the circuit.
Watt: Unit of electrical power. Watts = amperes x volts.
WOT: Wide open throttle.

2.11

GENERAL

2

SPECIAL TOOLS

Special Tools

2.12

GENERAL