Polaris 2003 Pro X Service Manual page 26

GENERAL INFORMATION
Pre-Ignition: A problem in combustion where the fuel/air mixture is ignited before normal spark ignition. Piston looks
melted at area of damage. Possible causes: 1) too hot a spark plug; 2) spark plug not properly torqued; 3) "glowing"
piece of head gasket, metal burr or carbon in the combustion chamber; 4) lean fuel/air mixture; 5) Incorrect ignition
timing.
Primary Circuit: This circuit is responsible for the voltage build up in the primary windings of the coil. Parts of this circuit
include the exciter coil, points and condenser, wires from the stator plate to the small primary winding in the ignition coil.
In the CDI system the parts include the exciter coil, the trigger coil, the wires from stator plate to CDI box and to the low
resistance primary windings in the ignition coil.
Primary Clutch: Drive clutch on engine.
Primary Compression: Pressure built up in the crankcase of a two stroke engine.
psi.: Pounds per square inch.
Pushing: When the front of the vehicle does not steer as much as the driver desires. The skis do not grab sufficiently.
R & R: Remove and replace.
RFI: Radio Frequency Interference. Caused by high voltage from the ignition system. There are special plug caps and
spark plugs to help eliminate this problem. Required in Canada.
RPM: Revolutions Per Minute.
Relay Coils: Electromagnetic device in an EFI system which controls circuit connection with input from another circuit.
Resistance: In the mechanical sense, friction or load. In the electrical sense, ohms. Both result in energy conversion to
heat.
Right Side: Always referred to based on normal operating position of the driver.
Round Head Screw:The familiar head most universally used for general application. Good slot depth, ample
underhead bearing surface and finished appearance are characteristic of this head.
Running Time: Ignition timing when fully advanced or at specified RPM.
Secondary Circuit: This circuit consists of the large secondary coil windings, high tension wire and ground through the
spark plug air gap.
Secondary Clutch: Driven clutch on chaincase or jackshaft.
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.
Self Steer: Pulling the machine to the inside of the track.
Spark Plug Reach: Length of threaded portion of spark plug. Polaris uses 3/4" (2 cm..) reach plugs.
Static Timing: Ignition timing when engine is at zero RPM.
Stator Plate: The plate mounted under the flywheel supporting the primary ignition components and lighting coils.
Stroke: The maximum movement of the piston from bottom dead center to top dead center. It is characterized by 180
of crankshaft rotation.
Surge Tank: The fill tank in the liquid cooling system.
TDC: Top Dead Center. Piston's most outward travel from crankshaft.
Transfer: The movement of fuel/air from the crankcase to the combustion chamber in a two stroke engine.
Trigger Coil: Pulser coil. Generates the voltage for triggering (closing) the thyristor and timing the spark in CDI
systems. Small coil mounted at the top of the stator plate next to the ignition generating coil.
V Regulator: Voltage regulator. Maintains maximum lighting coil output at approx. 14.5 ACV as engine RPM
increases.
Venturi: An area of air constriction. A venturi is used in carburetors to speed up air flow which lowers pressure in venturi
to below atmospheric pressure, causing fuel to be pushed through jets, etc., and into the venturi to be mixed with air and
form a combustible air/fuel mixture.
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.
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