Motorcycle Glossary of Terms
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Pannier(s) - Motorcycle luggage
holder, fitted on the rear. More popular with
touring motorcycle ranges.
Parallel Twin - A two-cylinder
engine configuration in which both cylinders
are mounted side-by-side and accross the frame.
- Non-factory copies of original motorcycloe
Ped - Moped.
Pillion - Passenger on a motorcycle.
Pinking - A distinctive noise
from an engine with over-advanced ignition or
Piston - The component driven
down the cylinder by expanding gases.
Piston slap - Knocking caused
by piston wear.
Plantif - A party bringing
a case against another.
Polarity - Either negative
or positive earth (ground), determined by which
battery lead is connected to the frame (earth
return). Modern motorcycles are usually negative
Post-vintage - A motorcycle
made after December 31st 1930 and before January
Power ranger - Term often
used to describe a Sunday motorcycle rider.
Pre-ignition - A situation
where the fuel/air mixture ignites before the
spark plug fires. Often due to a hot spot in
the combustion chamber caused by carbon build-up.
The engine has a tendancy to run-on.
Premix - The method of engine
lubrication on older two-stroke engines. Engine
oil is mixed with the petrol in the fuel tank
in a specific ratio. The fuel/oil mix is sometimes
referred to as petroil.
Pressure plate - The plate
against which the clutch springs react to load
the friction plates.
Primary chain - Chain that
connects the crankshaft sprocket to the Clutch
or Gear box sprocket.
Primary drive - Description
of the drive from the crankshaft to the clutch.
Usually by gear or chain.
PS - Pfedestarke - A German
interpretation of BHP.
PSI - Pounds-force per square
inch. Imperial measurement of tyre pressure
and cylinder measurements.
Pushrods - Operating rods
rods for overhead valves , working from cams
below the cylinder.