General Information
1.23
Service Glossary -- Continu ed
lorltr: Liter. One liter = 1.0567 U.S. quarts.
lbs/in
2
: Pounds per square inch.
Inch Pound: In. lb. 12 in. lbs. = 1 ft. lb.
Left Side: The left hand side of the vehicle. 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. This is how mechanical energy is converted to electrical energy in the lighting coil, ignition generating
coils and trigger coil.
mi.: Mile/miles.
mm: Millimeter. Unit of length in the metric system. 1mm = .040².
N-m: Newton meters.
OD: Outside diameter.
Ohm: The unit of electrical resistance opposing current flow .
Open Circuit: An electrical circuit which is incomplete. (e.g. poor connections or broken wire preventing the flow
of current).
oz.: Ounce/ounces.
Piston Clearance: Total distance between piston and cylinder wall.
Piston Erosion: Piston dome melts. Usually occurs at the exhaust port area. Possible causes: 1) lean fuel/air
mixture; 2) improper spark plug heat range.
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) Spark plug heat range incorrect (too hot) 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.
Primary Circuit: This circuit is responsible for the voltage build up in the CDI capacitor. In a CDI system the parts
include the exciter coil, the trigger coil, the wires from stator plate to CDI box and to the ignition coil primary
windings.
psi.: Pounds per square inch.
pts: Pint/pints
PTO: Power take off.
qt.: Quart/quarts.
RPM: Revolutions per minute.
Resistance: In the mechanical sense, friction or load. In the electrical sense, ohms. Both result in energy
conversion to heat.
Right Side: The right hand side of the vehicle. Always Referred to based on normal operating position of the rider.
Running Time: Ignition timing at specified RPM.
Secondary Circuit: This circuit consists of the ignition coil secondary windings, high tension wire and ground
through the spark plug air gap.
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.
Short Circuit: An electrical circuit which is completed before the current reaches the intended component. (e.g.
a bare wire touching a grounded component.
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 coil.
TDC: Top dead center. Piston’s most outward travel from crankshaft.
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.
Voltage Regulator: An electrical device which prevents overcharging of the battery or overloading of electrical
components as engine RPM increases.
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