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| A - D
E - H
I - L M - P
Q - T U - Z |
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Ignition Timing
The process of setting the time that a spark will occur in the engine combustion
chamber (during the power stroke) relative to piston position or crankshaft
rotation. Setting the correct ignition timing is crucial in the performance of
an engine. The ignition timing affects many variables including engine
longevity, fuel economy, and engine power. Modern engines that are controlled by
an engine control unit use a computer to control the timing throughout the
engine’s RPM range. Older engines that use mechanical spark distributors rely on
inertia (by using rotating weights and springs) and manifold vacuum in order to
set the ignition timing throughout the engine’s RPM range.
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Knobbies
The type of tires used by supercross and motocross racers. These tires have
large square knobs of rubber tread that are designed and arranged in various
ways to best grab the dirt. Sometimes mechanics take knobby tires and carve them
even more with a hot tire cutter–in order to help the tire pattern best match
the terrain.
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Low Side
A motorcycle crash that results from a wheel losing traction, allowing the bike
to fall sideways. The name derives from the fact that it is usually the inward
side that the motorcycle will fall on, or the side that points downward in a
curve, the low side. Riders are usually advised to do a lowsider rather than a
highsider if neither can be avoided. The lowsider has the advantage of the
motorcycle sliding before the rider, placing it out of harm’s way.
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