Polaris 2000 120 XCR, Service Manual

Page: 23 / 99

2.8
GENERAL
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.
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: Centrifugal 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.
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 = Nm
in-lb x.0115 = kg-m
Nm x.7376 = ft-lb
kg-m x 7.233 = ft-lb
kg-m x 86.796 = in-lb
kg-m x 10 = Nm
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)