Motorcycle Glossary of Terms
Please e-mail us if you have
a glossary term suggestion to add to our motorcycle
Ibf ft - Pounds-force feet.
An imperial unit on torque. Sometimes written
Ibf in - Pound-force inch.
An imperial unit of torque, applied to components
where a very low torque is required. Sometimes
written as in-lbs.
Ignition advance - Means
of increasing the timing of the spark at higher
enigne speeds. Done by mechanical means (ATU)
on early engines or electronically by the
ignition control unit on later engines.
Ignition timing - The moment
at which the spark plug fires, expressed in
the number of crankshaft degrees before the
piston reaches the top of its stroke, or in
the number of millimetres before the piston
reaches the top of its stroke.
Inverted forks (upside down
forks) - The sliders or lower legs are held
on the yokes and the fork tubes or stanchions
are connected to the wheel axle (spindle).
Less unsprung weight and stiffer construction
than conventional forks.
IOE - Inlet over exhaust,
a common arrangement with an overhead inlet
and side exhaust.