Motorcycle Glossary of Terms
Please e-mail us if you have
a glossary term suggestion to add to our motorcycle
Fanny - Common term for
a Francis Barnet motorcycle.
Featherbed - A Norton frame,
designed by Rex and Crommie McCandless, Belfast,
used for racing machines from 1950, road machines
Feeler blade or guage -
A thin strip or blade or hardened steel, ground
to an exact thickness, used to check or measure
clearances between parts.
FIM - Federation Internationale
Motorcyclists, controls motorcycle sport worldwide.
Final drive - Description
of the drive from the transmission to the
rear wheel. Usually by chain or shaft, but
sometimes by belt.
Firing order - The order
in which the engine cylinders fire, or deliver
their power strokes, beginning with the number
Fizzy - Slang for Yamaha's
Flat head - A flat surfaced
Flat spot - Occurs when
the rider opens the throttle but there is
a delay in the engine responding. Usually
caused by incorrect fuel/air mixture.
Flat twin - An engine with
2 horizontally opposed cylinders, or 4 to
make a flat Four.
Float - A plastic or brass
box which floats upon the fuel in a float
chamber and operates the needle valve controlling
Flywheel - Attached to the
crankshaft this heavy wheel smooths intermittent
firing impulses and helps slow running.
Four-stroke - This is the
most common design found in motorcycles today.
It refers to the number of times a piston
moves up and down through each power cycle.
1) A downward stroke brings in the fuel/air
mixture; 2) an upward stroke compresses the
fuel/air mixture; 3) a downward stroke results
when that mixture is ignited and expands,
and finally; 4) an upward stroke expels the
Friction drive - An early
form of drive using discs in contact instead
of chains and gears.
Fuel consumption - A way
of measureing how efficiently your engine
burns fuel, measured in miles per gallon (mpg).
Fuel injection - The fuel/air
mixture is metered electronically and directed
into the engine intake ports (indirect injection)
or into the cylinders (direct injection).
Sensors supply information on engine speed
Fueler - Term used for Nitros
Oxide Drag bike or car.